VSC8641
10/100/1000BASE-T PHY with RGMII
and GMII MAC Interface
Datasheet
VMDS-10211
Revision 4.3
August 2009
Vitesse
Corporate Headquarters
741 Calle Plano
Camarillo, California 93012
United States
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Copyright© 2005–2009 by Vitesse Semiconductor Corporation
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Revision 4.3
August 2009
Page 2
VSC8641 Datasheet
Contents
Contents
Revision History ........................................................................................10
1
2
Introduction.....................................................................................16
Product Overview.............................................................................17
2.1
2.2
2.3
3
Functional Descriptions....................................................................20
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
4
Features ........................................................................................................... 17
Applications....................................................................................................... 18
Block Diagram ................................................................................................... 19
Operating Modes ................................................................................................ 20
MAC Interface.................................................................................................... 20
3.2.1
MAC Resistor Calibration .......................................................................... 20
3.2.2
RGMII MAC Interface Mode ...................................................................... 20
3.2.3
GMII/MII MAC Interface Mode .................................................................. 21
Cat5 Media Interface .......................................................................................... 22
Cat5 Auto-Negotiation ........................................................................................ 23
Manual MDI/MDI-X Setting .................................................................................. 24
Automatic Crossover and Polarity Detection ........................................................... 24
Link Speed Downshift ......................................................................................... 25
Transformerless Ethernet..................................................................................... 25
Ethernet Inline Powered Devices .......................................................................... 25
ActiPHY Power Management................................................................................. 27
3.10.1 Low-Power State .................................................................................... 28
3.10.2 Link Partner Wake-Up State ..................................................................... 28
3.10.3 Normal Operating State ........................................................................... 29
Serial Management Interface ............................................................................... 29
3.11.1 SMI Frames ........................................................................................... 29
3.11.2 SMI Interrupts ....................................................................................... 30
LED Interface .................................................................................................... 31
3.12.1 Simple or Enhanced LED Method............................................................... 31
3.12.2 LED Modes............................................................................................. 32
3.12.3 LED Behavior ......................................................................................... 33
Testing Features................................................................................................. 34
3.13.1 Ethernet Packet Generator (EPG) .............................................................. 34
3.13.2 CRC Counters......................................................................................... 34
3.13.3 Far-end Loopback ................................................................................... 35
3.13.4 Near-End Loopback ................................................................................. 35
3.13.5 Connector Loopback................................................................................ 36
3.13.6 VeriPHY Cable Diagnostics........................................................................ 36
3.13.7 IEEE 1149.1 JTAG Boundary Scan ............................................................. 37
3.13.8 JTAG Instruction Codes............................................................................ 38
3.13.9 Boundary-Scan Register Cell Order............................................................ 39
Configuration ...................................................................................40
4.1
4.2
Revision 4.3
August 2009
Registers........................................................................................................... 40
4.1.1
Reserved Registers ................................................................................. 41
4.1.2
Reserved Bits ......................................................................................... 41
IEEE Standard and Main Registers ........................................................................ 41
4.2.1
Mode Control ......................................................................................... 42
Page 3
VSC8641 Datasheet
Contents
4.3
4.4
4.5
5
4.2.2
Mode Status........................................................................................... 43
4.2.3
Device Identification ............................................................................... 44
4.2.4
Auto-Negotiation Advertisement ............................................................... 44
4.2.5
Link Partner Auto-Negotiation Capability .................................................... 45
4.2.6
Auto-Negotiation Expansion ..................................................................... 46
4.2.7
Transmit Auto-Negotiation Next Page......................................................... 46
4.2.8
Auto-Negotiation Link Partner Next Page Receive ........................................ 46
4.2.9
1000BASE-T Control................................................................................ 47
4.2.10 1000BASE-T Status................................................................................. 48
4.2.11 Main Registers Reserved Addresses ........................................................... 48
4.2.12 1000BASE-T Status Extension 1................................................................ 48
4.2.13 100BASE-TX Status Extension .................................................................. 49
4.2.14 1000BASE-T Status Extension 2................................................................ 49
4.2.15 Bypass Control ....................................................................................... 50
4.2.16 Receive Error Counter ............................................................................. 51
4.2.17 False Carrier Sense Counter ..................................................................... 51
4.2.18 Disconnect Counter................................................................................. 52
4.2.19 Extended Control and Status .................................................................... 52
4.2.20 Extended PHY Control Set 1 ..................................................................... 53
4.2.21 Extended PHY Control Set 2 ..................................................................... 54
4.2.22 Interrupt Mask ....................................................................................... 54
4.2.23 Interrupt Status ..................................................................................... 55
4.2.24 LED Control ........................................................................................... 56
4.2.25 Auxiliary Control and Status ..................................................................... 57
4.2.26 Delay Skew Status.................................................................................. 57
4.2.27 Reserved Address Space .......................................................................... 58
Extended Page Registers ..................................................................................... 58
4.3.1
Extended Page Access ............................................................................. 59
4.3.2
Enhanced LED Method Select ................................................................... 59
4.3.3
Enhanced LED Behavior ........................................................................... 60
4.3.4
CRC Good Counter .................................................................................. 61
4.3.5
MAC Resistor Calibration Control ............................................................... 62
4.3.6
Extended PHY Control 3........................................................................... 62
4.3.7
EEPROM Interface Status and Control ........................................................ 63
4.3.8
EEPROM Data Read/Write ........................................................................ 63
4.3.9
Extended PHY Control 4........................................................................... 64
4.3.10 Reserved Extended Registers ................................................................... 64
4.3.11 Extended PHY Control 5........................................................................... 64
4.3.12 RGMII Skew Control................................................................................ 66
4.3.13 Ethernet Packet Generator (EPG) Control 1 ................................................ 66
4.3.14 Ethernet Packet Generator Control 2 ......................................................... 67
CMODE ............................................................................................................. 68
4.4.1
CMODE Pins and Related Functions ........................................................... 68
4.4.2
Functions and Related CMODE Pins ........................................................... 68
4.4.3
CMODE Resistor Values............................................................................ 69
EEPROM............................................................................................................ 70
4.5.1
EEPROM Contents Description .................................................................. 70
4.5.2
Read/Write Access to the EEPROM ............................................................ 71
Electrical Specifications ...................................................................73
5.1
5.2
Revision 4.3
August 2009
DC Characteristics .............................................................................................. 73
5.1.1
VDDIO at 3.3 V ...................................................................................... 73
5.1.2
VDDIO at 2.5 V ...................................................................................... 74
Current Consumption.......................................................................................... 74
5.2.1
Consumption with 1000BASE-T Link .......................................................... 74
Page 4
VSC8641 Datasheet
Contents
5.3
5.4
5.5
6
Pin Descriptions ...............................................................................93
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
7
Pin Diagram (VSC8641XJF).................................................................................. 94
Pins By Function (VSC8641XJF)............................................................................ 95
6.2.1
Twisted Pair Interface .............................................................................. 95
6.2.2
GMII/RGMII MAC Interface ...................................................................... 95
6.2.3
Serial Management Interface (SMI)........................................................... 98
6.2.4
JTAG ..................................................................................................... 99
6.2.5
Miscellaneous......................................................................................... 99
6.2.6
Power Supply ....................................................................................... 100
6.2.7
Power Supply and Associated Function..................................................... 101
Pins by Number (VSC8641XJF)........................................................................... 102
Pins by Name (VSC8641XJF).............................................................................. 103
Pin Diagram (VSC8641XKO, VSC8641XKO-03) ..................................................... 104
Pins by Function (VSC8641XKO, VSC8641XKO-03) ............................................... 105
6.6.1
Twisted Pair Interface ............................................................................ 105
6.6.2
GMII/RGMII MAC Interface .................................................................... 105
6.6.3
Serial Management Interface (SMI)......................................................... 108
6.6.4
JTAG ................................................................................................... 109
6.6.5
Miscellaneous....................................................................................... 109
6.6.6
Power Supply ....................................................................................... 110
6.6.7
Power Supply and Associated Function..................................................... 111
Pins by Number (VSC8641XKO, VSC8641XKO-03) ................................................ 112
Pins by Name (VSC8641XKO, VSC8641XKO-03) ................................................... 113
Package Information......................................................................114
7.1
7.2
7.3
8
5.2.2
Consumption with 100BASE-TX Link .......................................................... 76
5.2.3
Consumption with 10BASE-T Link.............................................................. 77
5.2.4
Consumption with No Link and ActiPHY Enabled .......................................... 78
5.2.5
Consumption with No Link and ActiPHY Disabled ......................................... 79
5.2.6
Consumption in Power-Down Mode............................................................ 80
5.2.7
Consumption in Reset State ..................................................................... 80
AC Characteristics .............................................................................................. 81
5.3.1
Reference Clock Input ............................................................................. 81
5.3.2
Clock Output .......................................................................................... 81
5.3.3
JTAG Interface ....................................................................................... 82
5.3.4
SMI Interface ......................................................................................... 83
5.3.5
Device Reset .......................................................................................... 84
5.3.6
GMII Transmit ........................................................................................ 85
5.3.7
GMII Receive ......................................................................................... 86
5.3.8
MII Transmit .......................................................................................... 87
5.3.9
MII Receive............................................................................................ 88
5.3.10 RGMII Uncompensated ............................................................................ 88
5.3.11 RGMII Compensated ............................................................................... 90
Operating Conditions .......................................................................................... 91
Stress Ratings ................................................................................................... 92
Package Drawings ............................................................................................ 114
Thermal Specifications ...................................................................................... 117
Moisture Sensitivity .......................................................................................... 117
Design Considerations ...................................................................118
8.1
8.2
8.3
Revision 4.3
August 2009
RX_CLK Can Reach as High as 55% Duty Cycle .................................................... 118
First SMI Write Fails after Software Reset ............................................................ 118
Link-Up Issue In Forced 100BASE-TX Mode .......................................................... 118
Page 5
VSC8641 Datasheet
Contents
8.4
8.5
8.6
8.7
8.8
8.9
8.10
9
Default 10Base-T Settings Are Marginal and Cause MAU Test Failure........................ 119
On-Chip Pull-up Resistor Violation....................................................................... 121
Setting the Internal RGMII Timing Compensation Value ......................................... 121
10BASE-T Harmonics at 30 MHz and 50 MHz Marginally Violate Specification ............ 122
Voltage Overshoot When Using On-Chip Switching Regulator.................................. 122
Long Link-Up Times Caused by Noise on the Twisted Pair Interface ......................... 122
High VDD33 and Low VDDIOMAC Supply ............................................................. 123
Ordering Information .....................................................................124
Revision 4.3
August 2009
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VSC8641 Datasheet
Contents
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Typical Application...................................................................................... 17
High-level Block Diagram ............................................................................ 19
RGMII or GMII to Cat5 Block Diagram........................................................... 20
RGMII MAC Interface .................................................................................. 21
GMII/MII MAC Interface .............................................................................. 22
Cat5 Media Interface .................................................................................. 23
Inline Powered Ethernet Switch Diagram ....................................................... 26
ActiPHY State ............................................................................................ 28
SMI Read Frame ........................................................................................ 29
SMI Write Frame........................................................................................ 30
MDINT Configured as an Open-Drain (Active-Low) Pin..................................... 31
MDINT Configured as an Open-Source (Active-High) Pin .................................. 31
Far-End Loopback ...................................................................................... 35
Near-End Loopback .................................................................................... 35
Connector Loopback ................................................................................... 36
Test Access Port and Boundary-Scan Architecture ........................................... 38
Register Space Diagram .............................................................................. 40
EEPROM Read and Write Register Flow .......................................................... 72
JTAG Interface Timing ................................................................................ 83
SMI Interface Timing .................................................................................. 84
Reset Timing ............................................................................................. 85
GMII Transmit Timing ................................................................................. 86
GMII Receive Timing .................................................................................. 87
MII Transmit Timing ................................................................................... 87
MII Receive Timing..................................................................................... 88
RGMII Uncompensated Timing ..................................................................... 89
RGMII Compensated Timing ........................................................................ 91
Pin Diagram for VSC8641XJF ....................................................................... 94
Pin Diagram for VSC8641XKO and VSC8641XKO-03 ..................................... 104
Package Drawing for VSC8641XJF .............................................................. 115
Package Drawing for VSC8641XKO and VSC8641XKO-03............................... 116
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VSC8641 Datasheet
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Operating Modes........................................................................................ 20
Supported MDI Pair Combinations ................................................................ 25
LED Mode and Function Summary ................................................................ 32
JTAG Device Identification Register Description .............................................. 39
JTAG Interface Instruction Codes ................................................................. 39
IEEE 802.3 Standard Registers .................................................................... 41
Main Registers ........................................................................................... 41
Mode Control, Address 0 (0x00)................................................................... 42
Mode Status, Address 1 (0x01) .................................................................... 43
Identifier 1, Address 2 (0x02)...................................................................... 44
Identifier 2, Address 3 (0x03)...................................................................... 44
Device Auto-Negotiation Advertisement, Address 4 (0x04) .............................. 44
Auto-Negotiation Link Partner Ability, Address 5 (0x05)................................... 45
Auto-Negotiation Expansion, Address 6 (0x06)............................................... 46
Auto-Negotiation Next Page Transmit, Address 7 (0x07) .................................. 46
Auto-Negotiation LP Next Page Receive, Address 8 (0x08) ............................... 46
1000BASE-T Control, Address 9 (0x09) ......................................................... 47
1000BASE-T Status, Address 10 (0x0A) ........................................................ 48
1000BASE-T Status Extension 1, Address 15 (0x0F) ....................................... 48
100BASE-TX Status Extension, Address 16 (0x10) .......................................... 49
1000BASE-T Status Extension 2, Address 17 (0x11) ....................................... 49
Bypass Control, Address 18 (0x12)............................................................... 50
Receive Error Counter, Address 19 (0x13) ..................................................... 51
False Carrier Sense Counter, Address 20 (0x14) ............................................. 51
Disconnect Counter, Address 21 (0x15)......................................................... 52
Extended Control and Status, Address 22 (0x16) ........................................... 52
Extended PHY Control 1, Address 23 (0x17) .................................................. 53
Extended PHY Control 2, Address 24 (0x18) .................................................. 54
Interrupt Mask, Address 25 (0x19)............................................................... 54
Interrupt Status, Address 26 (0x1A)............................................................. 55
LED Control, Address 27 (0x1B)................................................................... 56
Auxiliary Control and Status, Address 28 (0x1C) ............................................ 57
Delay Skew Status, Address = 29 (0x1D)...................................................... 57
Extended Registers Page Space.................................................................... 58
Extended Page Access, Address 31 (0x1F)..................................................... 59
Enhanced LED Method Select, Address 16E (0x10) ......................................... 59
Available LED Mode Settings........................................................................ 59
Enhanced LED Behavior, Address 17E (0x11) ................................................. 60
CRC Good Counter, Address 18E (0x12) ........................................................ 61
MAC Resistor Calibration Control, Address 19E (0x13)..................................... 62
Extended PHY Control 3, Address 20E (0x14)................................................. 62
EEPROM Interface Status and Control, Address 21E (0x15).............................. 63
EEPROM Read or Write, Address 22E (0x16) .................................................. 63
Extended PHY Control 4, Address 23E (0x17)................................................. 64
Extended PHY Control 5, Address 27E (0x1B) ................................................ 64
RGMII Skew Control, Address 28E (0x1C) ..................................................... 66
EPG Control Register 1, Address 29E (0x1D).................................................. 66
EPG Control Register 2, Address 30E (0x1E) .................................................. 67
CMODE Configuration Pins and Device Functions ............................................ 68
Device Functions and Associated CMODE Pins ................................................ 68
CMODE Resistor Values and Resultant Bit Settings .......................................... 69
EEPROM Configuration Contents................................................................... 71
DC Characteristics for VDD33, VDDIOMAC, or VDDIOMICRO at 3.3 V ................ 73
Page 8
VSC8641 Datasheet
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DC Characteristics for VDDIOMAC or VDDIOMICRO at 2.5 V............................. 74
Current Consumption: 1000BASE-T, Regulator Enabled ................................... 74
Current Consumption: 1000BASE-T, Regulator Disabled................................... 75
Current Consumption: 100BASE-TX, Regulator Enabled ................................... 76
Current Consumption: 100BASE-TX, Regulator Disabled .................................. 76
Current Consumption: 10BASE-T, Regulator Enabled ....................................... 77
Current Consumption: 10BASE-T, Regulator Disabled ...................................... 77
Current Consumption: No Link, ActiPHY Enabled, Regulator Enabled ................. 78
Current Consumption: No Link, ActiPHY Enabled, Regulator Disabled ................ 78
Current Consumption: No Link, ActiPHY Disabled, Regulator Enabled ................ 79
Current Consumption: No Link, ActiPHY Disabled, Regulator Disabled................ 79
Current Consumption: Power-Down, Regulator Enabled................................... 80
Current Consumption: Power-Down, Regulator Disabled .................................. 80
Current Consumption: Reset State ............................................................... 80
AC Characteristics for REFCLK Input ............................................................. 81
AC Characteristics for REFCLK Input with 25 MHz Clock Input .......................... 81
AC Characteristics for the CLKOUT Pin .......................................................... 81
AC Characteristics for the JTAG Interface....................................................... 82
AC Characteristics for the SMI Interface ........................................................ 83
AC Characteristics for Device Reset .............................................................. 84
AC Characteristics for GMII Transmit............................................................. 85
AC Characteristics for GMII Transmit............................................................. 86
AC Characteristics for MII Transmit............................................................... 87
AC Characteristics for MII Receive ................................................................ 88
AC Characteristics for RGMII Uncompensated ................................................ 88
AC Characteristics for RGMII Compensated.................................................... 90
Recommended Operating Conditions............................................................. 91
Stress Ratings ........................................................................................... 92
Pin Type Symbols ....................................................................................... 93
Twisted Pair Interface Pins........................................................................... 95
GMII/RGMII MAC Interface Pins ................................................................... 95
SMI Pins ................................................................................................... 98
JTAG Pins.................................................................................................. 99
Miscellaneous Pins ..................................................................................... 99
Power Supply Pins.................................................................................... 100
Power Supply Pins and Associated Function Pins........................................... 101
Twisted Pair Interface Pins......................................................................... 105
GMII/RGMII MAC Interface Pins ................................................................. 105
SMI Pins ................................................................................................. 108
JTAG Pins................................................................................................ 109
Miscellaneous Pins ................................................................................... 109
Power Supply Pins.................................................................................... 110
Power Supply Pins and Associated Function Pins........................................... 111
Thermal Resistances................................................................................. 117
Ordering Information................................................................................ 124
Page 9
VSC8641 Datasheet
Revision History
Revision History
This section describes the changes that were implemented in this document. The
changes are listed by revision, starting with the most current publication.
Revision 4.3
Revision 4.3 of this datasheet was published in August 2009. The following is a
summary of the changes implemented in the datasheet:
•
VSC8641XJF device information was added.
•
Three design considerations were added:
Voltage Overshoot When Using On-Chip Switching Regulator The device’s
on-chip switching regulator generates notable voltage overshoot, which may lead to
device performance issues such as CRC errors, jitter, or both.
Long Link-Up Times Caused by Noise on the Twisted Pair
Interface Normally, the VSC8641 device successfully links during
auto-negotiation when there is signal noise coming from the link partner. However,
on rare occasions when the VSC8641 device uses the same cable as the link
partner, the link-up time can be significantly increased for successful
auto-negotiation.
High VDD33 and Low VDDIOMAC Supply If VDD33 is set to the maximum
allowed 3.3 V supply and VDDIOMAC is set to the minimum allowed 3.3 V supply,
the VSC8641 device can experience performance issues.
For more information about the design considerations and their workarounds, see
“Design Considerations,” page 118.
Revision 4.2
Revision 4.2 of this datasheet was published in May 2008. The following is a summary
of the changes implemented in the datasheet:
•
The delay setting for register 23, bit 8 was corrected from 2 ns to 1.7 ns.
Additionally, the RGMII clock skew function was updated to clarify that CMODE pin
2, bit 1, and 0 will set both register 23, bit 8 and register 28E, bits 15:12.
•
A note was added to the serial management interface pin descriptions to clarify that
the NRESET pin is referenced to VDD33. Additionally, referenced VDD33 pins
OSCEN, PLLMODE, REG_EN, and REF_CLK were added to the pin identifications.
•
Four design guidelines were added to the design considerations:
Default 10Base-T Settings are Marginal and Cause MAU Test Failure The
default settings are marginal for PHY silicon and magnetic module variations and
may cause the output 10Base-T signal to violate the IEEE waveform template.
On-Chip Pull-up Resistor Violation
Revision 4.3
August 2009
An on-chip pull-up resistor included on the
Page 10
VSC8641 Datasheet
Revision History
VSC8641 device violates IEEE specification 802.3. The VSC8641 requires an
off-chip and an on-chip pull-up resistor for the interface to work properly.
Setting the Internal RGMII Timing Compensation Value There are two
inter-related registers that control the internal RGMII skew timing compensation in
which register 23.8 can potentially overwrite register 28E.
10BASE-T Harmonics at 30 MHz and 50 MHz Marginally Violates
Specification The IEEE 802.3 specification states that in 10BASE-T mode, when
the DO circuit is driven by an all-ones, Manchester-encoded signal, any harmonic
measured on the TD circuit must be at least 27 dB below the fundamental. In
VSC8641, this specification is marginally violated at 30 MHz and 50 MHz when this
measurement is made under corner conditions.
Revision 4.1
Revision 4.1 of this datasheet was published in July 2007. The following is a summary
of the changes implemented in the datasheet:
•
VSC8641-03 is now available. It has an extended operating temperature range of
–40 °C ambient to 90 °C case.
•
A design guideline was added regarding delays in the link-up process while in the
forced 100BASE-TX mode with the automatic crossover detection feature enabled.
•
The following design guidelines were removed, because they no longer apply to the
device: Remote Fault Status; DSP Optimization Script Required; Default Port Type
Incorrect; and Core 1.2 V Supply Needs to Meet Specific Range.
Revision 4.0
Revision 4.0 of this datasheet was published in December 2006. The following is a
summary of the changes implemented in the datasheet:
Revision 4.3
August 2009
•
The VSC8641KO package was removed from the datasheet. VSC8641XKO remains
available.
•
In the jumbo packet register settings (28E.11:10), the packet lengths were
updated.
•
In several current consumption specifications, the values for total power at 2.5 V
were corrected. The previous values were slightly elevated.
•
In the DC characteristics for VDDIO at 3.3 V, both the input and output leakage
current parameters (IILEAK and IOLEAK) were increased from ±36 µA to ±43 µA.
•
In the DC characteristics for VDDIO at 2.5 V, the minimum input high voltage (VIH)
was increased from 1.7 V to 2.0 V for all pins, except for GMII input pins, which
remain at 1.7 V minimum. Both the input and output leakage current parameters
(IILEAK and IOLEAK) were increased from ±25 µA to ±35 µA.
•
Current consumption specifications were added for both the power-down mode and
the reset state.
Page 11
VSC8641 Datasheet
Revision History
•
In the AC characteristics for the CLKOUT pin, the duty cycle (%DUTY) was modified
from 40% minimum to 44% minimum and from 60% maximum to 56% maximum.
Also, the total jitter (JCLK) was raised from 491 ps maximum to 600 ps maximum,
with the qualifier “time interval error” added to the condition.
•
In the SMI specifications, the MDC rise and fall times were corrected from minimum
values to maximum values.
•
For the device reset rise time specification, a condition was added that it is
measured from a 10% level to a 90% level.
•
In the AC characteristics for RGMII uncompensated, the 1000BASE-T duty cycle
(tDUTY1000) was separated into two sets of values. In the first set, the values remain
the same, but the added condition is: at room temperature and nominal supply and
register 28E.13:12 set to 10 or 11. In the second set, the minimum is 40% and the
maximum is 60% and the condition is: register 28E.13:12 set to 00 or 01.
•
In the AC characteristics for RGMII compensated, all of the setup and hold times
were modified from 0 ns to 3 ns.
•
The electrostatic discharge voltage values were added. For charged device model, it
is ±500 V. For human body model, it is ±1750 V.
•
In the description of pin MDIO, the type was corrected from open drain (OD) to
input and output (I/O).
•
The PLLMODE pin description was updated with additional clocking information. If a
crystal or an external 25 MHz clock is used, PLLMODE must be pulled low. If an
external 125 MHz clock is used, PLLMODE must be pulled high.
•
The moisture sensitivity is now specified as level 3.
•
A design guideline was added regarding writes from the serial management
interface (SMI) after a software reset.
Revision 2.3
Revision 2.3 of this datasheet was published in July 2006. The following is a summary
of the changes implemented in the datasheet:
Revision 4.3
August 2009
•
In the inline powered Ethernet switch diagram, a reference to “SGMII interface”
was corrected to “RGMII interface.”
•
In the description of CRC counters, the CRC good counter’s highest value was
corrected from 10,000 to 9,999 packets, after which the counter clears.
•
The device revision number definition was updated from 0000 to 0001 in the
identifier 2 register (address 3) and the JTAG device identification.
•
In the DC Characteristics for VDD33, VDDIOMAC, or VDDIOMICRO at 3.3 V, the output
leakage (IOLEAK) was changed to match the same values as the input leakage
(IILEAK) with the same condition (internal resistor included). Specifically, the values
were changed from –10 µA minimum and 10 µA maximum to –36 µA minimum and
36 µA maximum.
Page 12
VSC8641 Datasheet
Revision History
•
In the DC Characteristics for VDDIOMAC or VDDIOMICRO at 2.5 V, the output leakage
(IOLEAK) was changed to match the same values as the input leakage (IILEAK) with
the same condition (internal resistor included). Specifically, the values were
changed from –10 µA minimum and 10 µA maximum to –25 µA minimum and
25 µA maximum.
•
In the DC characteristics for VDDIOMAC or VDDIOMICRO at 2.5 V, the output high
voltage parameter (VOH) incorrectly stated IOH = 1.0 mA as a condition. It is now
corrected to the condition IOH = –1.0 mA.
•
For all the current consumption specifications with the on-chip switching regulator
enabled, the specification values for IVDD12 and IVDD12A were removed because
they were inadvertently added in a prior revision of this document. The IVDD12 and
IVDD12A values are kept for current consumption with the regulator disabled.
•
For the 100BASE current consumption specifications, all references to the speed
were corrected from 100BASE-X to 100BASE-TX.
•
In the AC characteristics for the CLKOUT pin, the total jitter specifications were
added. They are 217 ps typical and 491 ps maximum.
•
For device reset, both the reset characteristics and timing diagram were updated to
include new parameters: reset rise time (tRST_RISE) and supply stable time
(tVDDSTABLE).
•
The MII transmit timing figure was updated to be more accurate and to imply when
the MAC must display valid data to the VSC8641.
•
In the stress ratings, the power supply voltage parameter was removed because it
was redundant.
•
In the pin description for TX_CLK, the rate was clarified to be 2.5 MHz for 10 Mbps
mode, 25 MHz for 100 Mbps mode, or 125 MHz for 1000 Mbps mode.
•
The errata item “RX_CLK Can Reach as High as 55% Duty Cycle” remains in effect
but all other errata items no longer apply to the latest part revision.
Revision 2.2
Revision 2.2 of this datasheet was published in March 2006. In revision 2.2 of the
document, in the list of GMII/RGMII MAC interface pins, two pin numbers were
corrected. The pin number for NSRESET was corrected from 32 to 50. The pin number
for OSCEN/CLKOUT was corrected from 43 to 66.
Revision 2.1
Revision 2.1 of this datasheet was published in February 2006. The following is a
summary of the changes implemented in the datasheet:
Revision 4.3
August 2009
•
In the high-level block diagram, representation of the XTAL pin was corrected from
“XTAL 1/2” to “XTAL1” and “XTAL2.”
•
New information was added about how to manually force the device to use MDI/
MDI-X.
Page 13
VSC8641 Datasheet
Revision History
Revision 4.3
August 2009
•
The VSC8641 device switches between the low-power state and LP wake-up state
every two seconds; the rate is not programmable, as was originally stated.
•
In the link partner wake-up state, the device sends FLP bursts for two seconds;
they are not limited to three bursts, as was originally stated.
•
In the description of the PHY address for the serial management interface (SMI), a
statement was removed that bits 2:0 represent the PHY of the device being
addressed.
•
For the enhanced LED method, controlled by MII Register 16E, two of the LED
modes have changed. Mode 11, TX activity, and mode 13, RX activity, are now both
reserved.
•
In the description of the far-end loopback testing feature, the controlling register
bit was corrected from 23.3 to 27E.10.
•
For the JTAG interface instructions EXTEST and SAMPLE/PRELOAD, the values for
register width were modified from TBD to 69.
•
For the Mode Control register (address 0), when bit 11 (power-down) is set, RGMII
in-band signaling will not function.
•
In the Identifier 2 register (address 3), which enables device identification, the
default for bits 9:4 was modified from TBD to 000011.
•
In the LED Control register (address 27), the name for bits 2 and 1 was corrected
from “link/activity” to simply “activity.”
•
In the ActiPHY Control (address 20E), bit 5 was reassigned from being reserved to
being the MAC RX_CLK disable parameter.
•
In the Extended PHY Control 5 register (address 27E), the settings have changed
for bits 8:6 and 5:3 (100BASE-TX and 1000BASE-T transmitter amplitude control).
For bits 8:6 (100BASE-TX), the setting 011 changed from +5 amplitude to
reserved, making bit setting 010 (+4 amplitude) the largest. For bits 5:3
(1000BASE-T), the setting 011 changed from +3 amplitude to reserved, making bit
setting 010 (+2 amplitude) the largest.
•
For added clarity, the table that lists device functions and related CMODE pins now
references the associated register and bit for each function.
•
For the EEPROM Configuration Contents table, some address locations were added
and the introductory text was corrected.
•
For the DC electrical specifications with VDDIO at 3.3 V and with VDDIO at 2.5 V, an
additional condition was added. The specifications may be considered valid only
when VDDREG = 3.3 V.
•
The current consumption specifications were replaced with a new set of
specifications.
•
In the recommended operating conditions, the minimum and maximum values
were modified for the VDDIOMICRO, VDDIOMAC, and VDD33 parameters at 3.3 V.
For all of these parameters, the minimum changed from 3.13 V to 3.0 V and the
maximum changed from 3.47 V to 3.6 V. The VDDREG parameter was added to the
recommended operating conditions.
Page 14
VSC8641 Datasheet
Revision History
•
In the stress ratings, a new rating was added for the VDDREG parameter.
•
In the section describing the device pins associated with the GMII/RGMII MAC
interface, the term “GMII” was missing. It is now included in the heading and
throughout this section.
•
In the ordering information, the pin count was corrected from 64 pins to 100 pins.
•
An errata section was added.
Revision 2.0
Revision 2.0 of this datasheet was published in December 2005. This was the first
publication of the document.
Revision 4.3
August 2009
Page 15
VSC8641 Datasheet
Introduction
1
Introduction
This document consists of descriptions and specifications for both functional and
physical aspects of the VSC8641 device.
In addition to the datasheet, Vitesse maintains an extensive device-specific library of
support and collateral materials that you may find useful in developing your own
product. Depending upon the Vitesse device, this library may include:
•
Software Development Kits with sample commands and scripts
•
Reference designs showing the Vitesse device built in to applications in ways
intended to exploit its relative strengths
•
Presentations highlighting the operational features and specifications of the device
to assist in developing your own product road map
•
Input/Output Buffer Information specification (IBIS) models to help you create and
support the interfaces available on the particular Vitesse product
•
Application notes that provide detailed descriptions of the use of the particular
Vitesse product to solve real-world problems
•
White papers published by industry experts that provide ancillary and background
information useful in developing products that take full advantage of Vitesse
product designs and capabilities
•
User guides that describe specific techniques for interfacing to the particular Vitesse
products
Visit and register as a user on the Vitesse Web site to keep abreast of the latest
innovations from research and development teams and the most current product and
application documentation. The address of the Vitesse Web site is www.vitesse.com.
Revision 4.3
August 2009
Page 16
VSC8641 Datasheet
Product Overview
2
Product Overview
The VSC8641 device is a low-power Gigabit Ethernet (GbE) transceiver ideal for Gigabit
LAN-on-Motherboard applications. The device’s compact, plastic low-profile quad flat
package (LQFP) or quad flat no-lead (QFN) package with an exposed pad is optimal for
footprint-sensitive applications.
Vitesse’s mixed signal and digital signal processing (DSP) architecture assures robust
performance. It supports both half-duplex and full-duplex 10BASE-T, 100BASE-TX, and
1000BASE-T communication speeds over Category 5 (Cat5) unshielded twisted pair
(UTP) cable at distances greater than 140 m, displaying excellent tolerance to NEXT,
FEXT, echo, and other types of ambient environment and system electronic noise.
The following illustration shows a high-level, generic view of a VSC8641 application.
Figure 1.
Typical Application
3.3 V
10/100/1000BASE-T MAC,
Switching ASIC,
or Network Processor
RGMII
or
GMII
VSC8641
10/100/1000BASE-T
Transceiver
Management I/F (MDC / MDIO)
2.1
RJ45+Magnetics
25 MHz
Features
This section lists key aspects of the VSC8641 device functionality and design that
distinguish it from similar products:
Revision 4.3
August 2009
•
10/100/1000BASE-T PHY with industry’s lowest power consumption.
•
Compliant with IEEE 802.3 (10BASE-T, 100BASE-TX, 1000BASE-T) specifications.
•
Supports RGMII versions 1.3 and 2.0 and GMII/MII (2.5 V, 3.3 V) MAC interfaces.
•
Low EMI line driver with integrated line side termination resistors.
•
Up to 16 kB jumbo frame support in all speeds.
•
Four programmable direct drive LEDs.
•
Suite of test modes, including loopback paths, Ethernet packet generators, and CRC
counters.
•
The VeriPHY® suite provides extensive network cable information such as cable
length, termination status, and open/short fault location.
•
ActiPHYTM power saving modes.
•
Advanced power management complies with Wake-on-LANTM and PCI2.2 power
requirements.
Page 17
VSC8641 Datasheet
Product Overview
2.2
•
Legacy Power-over-Ethernet (POE) support.
•
Powered by a single 3.3 V supply by using the optional on-chip switching regulator.
•
IEEE 1149.1 JTAG boundary-scan support.
•
10 mm × 10 mm, 88-pin, plastic QFN package with an exposed pad.
•
12 mm × 12 mm, 100-pin, plastic LQFP package with an exposed pad.
Applications
Suggested applications for the VSC8641 device include:
Revision 4.3
August 2009
•
LAN-on-Motherboards, NICs, and mobile PCs
•
iSCSI and TOE applications
•
Workgroup and desktop switches and routers
•
Gigabit Ethernet SAN, NAS, and MAN systems
•
Network-enabled devices such as printers, IP phones, and gaming appliances
•
ATCATM 3.0 and PICMGTM 2.16 Ethernet backplane applications
Page 18
VSC8641 Datasheet
Product Overview
2.3
Block Diagram
The following illustration shows the primary functional blocks of the VSC8641 device.
Figure 2.
GTX_CLK
TX_CLK
TXD[7:0]
TX_EN
TX_ER
CRS
COL
RX_CLK
RXD[7:0]
RX_DV
RX_ER
High-level Block Diagram
TXVPA
TXVNA
R/GMII
MAC
Interface
Jumbo Packet
FIFO
10/100/
1000BASE-T
PCS
10/100/
1000BASE-T
PMA
MDI
Twisted Pair
Interface
MDI Reference
NRESET
MDC
MDIO
MDINT
JTAG
Management
and Control
Interface
LED Interface
LED[3:0]
REG_EN
REG_OUT
NTRST
TMS
TCK
TDO
TDI
REF_REXT
XTAL1
XTAL2
CLKOUT
Power Regulation
EECLK
REF_FILT
PLL
EEDAT
Revision 4.3
August 2009
TXVPC
TXVNC
TXVPD
TXVND
CMODE[4:0]
NSRESET
TXVPB
TXVNB
Page 19
VSC8641 Datasheet
Functional Descriptions
3
Functional Descriptions
This section provides detailed information about how the VSC8641 device works, what
configurations and operational features are available, and how to test its functions. It
includes descriptions of the various device interfaces and how to set them up.
3.1
Operating Modes
The following table and illustration show the device operating modes and supported
media.
Table 1.
Operating Modes
Operating Mode
MAC Interface
RGMII — Cat5
GMII — Cat5
Figure 3.
10/100/1000BASE-T
GMII / MII
10/100/1000BASE-T
RGMII or GMII to Cat5 Block Diagram
MAC
3.2
Supported Media
RGMII
RGMII or
GMII
VSC8641
Cat5
Cat5
Link Partner
MAC Interface
The VSC8641 supports RGMII versions 1.3 and 2.0 and GMII/MII (2.5 V, 3.3 V) MAC
interfaces.
3.2.1
MAC Resistor Calibration
To simplify board design, the VSC8641 MAC interface uses SimpliPINTM outputs that can
self-calibrate to a desired impedance characteristic to eliminate the need for series
termination resistors. By default, these RX output pins calibrate to 50 Ω. In addition,
MII Register 19E, bits 15:14 can be used to select different target impedances. For
more information, see “MAC Resistor Calibration Control,” page 62.
3.2.2
RGMII MAC Interface Mode
The RGMII interface can support all three speeds (10 Mbps, 100 Mbps, and 1000 Mbps)
and is used as an interface to an RGMII-compatible MAC.
Revision 4.3
August 2009
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VSC8641 Datasheet
Functional Descriptions
Figure 4.
RGMII MAC Interface
SimpliPHY
RGMII MAC
TD[3]
RT
RT
TD[0]
RT
RT
TXD[3]
TXD[2]
TXD[1]
TXD[0]
TXC
RT
TX_CLK
TX_CTL
RT
TD[2]
TD[1]
RD[3]
RD[2]
RD[1]
RD[0]
RXC
RX_CTL
3.2.3
TX_CTL
50
50
50
50
50
50
RXD[3]
RXD[2]
RXD[1]
RXD[0]
RX_CLK
RX_CTL
GMII/MII MAC Interface Mode
The GMII/MII interface can support all three speeds (10 Mbps, 100 Mbps, and
1000 Mbps) and is used as an interface to a GMII/MII-compatible MAC.
Revision 4.3
August 2009
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VSC8641 Datasheet
Functional Descriptions
Figure 5.
GMII/MII MAC Interface
GMII/MII MAC
RT
RT
TXD[ 7]
TXD[ 6]
TXD[ 5]
TXD[ 4]
TXD[ 3]
TXD[ 2]
TXD[ 1]
TXD[ 0]
RT
RT
RT
RT
RT
RT
TX_CLK
GTX_CLK
TX_ER
TX_EN
RT
RT
RT
50
COL
CRS
RXD[ 7]
RXD[ 6]
RXD[ 5]
RXD[ 4]
RXD[ 3]
RXD[ 2]
RXD[ 1]
RXD[ 0]
RX_CLK
RX_DV
RX_ER
3.3
SimpliPHY
TXD[7]
TXD[6]
TXD[5]
TXD[4]
TXD[3]
TXD[2]
TXD[1]
TXD[0]
TX_CLK
GTX_CLK
TX_ER
TX_EN
50
50
50
50
50
50
50
50
50
50
50
50
50
COL
CRS
RXD[7]
RXD[6]
RXD[5]
RXD[4]
RXD[3]
RXD[2]
RXD[1]
RXD[0]
RX_CLK
RX_DV
RX_ER
Cat5 Media Interface
The twisted pair interface on the VSC8641 is compliant with the IEEE802.3-2000
specifications for Cat5 media. The VSC8641, unlike other Gigabit PHYs, has all passive
components (required to connect the PHY’s Cat5 interface to an external 1:1
transformer) fully integrated into the device. The connection of the twisted pair
interface is shown in the following illustration.
Revision 4.3
August 2009
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VSC8641 Datasheet
Functional Descriptions
Figure 6.
Cat5 Media Interface
SimpliPHY
TXVP_A_n
Transformer
0.1 µF
RJ-45
1 A+
2 A-
TXVN_A_n
TXVP_B_n
0.1 µF
3
B+
6
B-
TXVN_B_n
TXVP_C_n
4
C+
5
C-
0.1 µF
TXVN_C_n
7
D+
8
D-
TXVP_D_n
0.1 µF
TXVN_D_n
75
75
1000pF, 2kV
75
75
3.4
Cat5 Auto-Negotiation
The VSC8641 device supports twisted pair auto-negotiation as defined by clause 28 of
the IEEE standard 802.3-2000.
The auto-negotiation process consists of the evaluation of the advertised capabilities of
the PHY and its link partner to determine the best possible operating mode, throughput
speed, duplex configuration, and master or slave operating modes in the case of
1000BASE-T setups. Auto-negotiation also allows a connected MAC to communicate
with its link partner MAC through the VSC8641 device using the optional “next pages,”
which set attributes that may not otherwise be defined by the IEEE standard.
In installations where the Cat5 link partner does not support auto-negotiation, the
VSC8641 automatically switches to use parallel detection to select the appropriate link
speed.
Clearing VSC8641 device register 0, bit 12 disables clause 28 twisted-pair autonegotiation. If auto-negotiation is disabled, the state of register bits 0.6, 0.13, and 0.8
determine the device operating speed and duplex mode. For more information about
configuring auto-negotiation, see “IEEE Standard and Main Registers,” page 41.
Revision 4.3
August 2009
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VSC8641 Datasheet
Functional Descriptions
3.5
Manual MDI/MDI-X Setting
As an alternative to automatic MDI/MDI-X detection (using HP Auto-MDIX technology),
you can force the PHY to select MDI or MDI-X using the following scripts.
Format:
Phywrite ( register(dec), data(hex) )
Phywritemask ( register(dec), data(hex), mask(hex) )
To force MDI:
Phywrite ( 31, 0x2A30 )
Phywritemask ( 5, 0x0010, 0x0018 )
Phywrite ( 31, 0x0000 )
To force MDI-X:
Phywrite ( 31, 0x2A30 )
Phywritemask ( 5, 0x0018, 0x0018 )
Phywrite ( 31, 0x0000 )
To resume MDI/MDI-X setting based on register 18, bits 7 and 5:
Phywrite ( 31, 0x2A30 )
Phywritemask ( 5, 0x0000, 0x0018 )
Phywrite ( 31, 0x0000 )
3.6
Automatic Crossover and Polarity Detection
For trouble-free configuration and management of Ethernet links, the VSC8641 device
includes a robust, automatic, media-dependent and crossed media-dependent
detection feature, HP Auto-MDIX, in all of its three available speeds (10BASE-T,
100BASE-T, and 1000BASE-T). The function is fully compliant with clause 40 of the
IEEE standard 802.3-2002.
Additionally, the device detects and corrects polarity errors on all MDI pairs—a useful
capability that exceeds the requirements of the standard.
Both HP Auto-MDIX detection and polarity correction are enabled in the device by
default. The default settings are adjustable using device register bits 18.5:4. Status
bits for each of these functions are located in register 28.
Revision 4.3
August 2009
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VSC8641 Datasheet
Functional Descriptions
The VSC8641 device’s algorithm for HP Auto-MDIX successfully detects, corrects, and
operates with any of the MDI wiring pair combinations listed in the following table.
Table 2.
Supported MDI Pair Combinations
RJ-45 Pin Pairings
1, 2
3, 6
4, 5
7, 8
A
B
C
D
Mode
Normal MDI
B
A
D
C
Normal MDI-X
A
B
D
C
Normal MDI with pair swap on C and D pair
B
A
C
D
Normal MDI-X with pair swap on C and D pair
Note The VSC8641 device can be configured to perform HP Auto-MDIX even when its
auto-negotiation feature is disabled (setting register 0.12 to 0) and the link is forced
into 10/100 speeds. To enable this feature, set register 27E.15 = 0.
3.7
Link Speed Downshift
For operation in cabling environments that are incompatible with 1000BASE-T, the
VSC8641 device provides an automatic link speed “downshift” option. When enabled,
the device automatically changes its 1000BASE-T auto-negotiation advertisement to
the next slower speed after a set number of failed attempts at 1000BASE-T.
This is useful in networks using older cable installations that may include only pairs A
and B and not pairs C and D.
To configure and monitor link speed downshifting, use register bits 20E.4:1. For more
information, see “Extended PHY Control Set 1,” page 53.
3.8
Transformerless Ethernet
The Cat5 media interface supports 10/100/1000BT Ethernet for backplane applications
such as those specified by the PICMGTM 2.16 and ATCATM 3.0 specifications for
eight-pin channels. With proper AC coupling, the typical Cat5 transformer can be
removed and replaced with capacitors.
3.9
Ethernet Inline Powered Devices
The VSC8641 device can detect inline powered devices in Ethernet network
applications. Its inline powered detection capability can be part of a system that allows
for IP-phone and other devices, such as wireless access points, to receive power
directly from their Ethernet cable, similar to office digital phones receiving power from
a Private Branch Exchange (PBX) office switch over the telephone cabling. This can
eliminate the need for an IP-phone to have an external power supply. It also enables
the inline powered device to remain active during a power outage (assuming the
Ethernet switch is connected to an uninterrupted power supply, battery, back-up power
generator, or some other uninterruptible power source).
For more information about inline powered device detection, visit the Cisco Web site at
www.cisco.com.
Revision 4.3
August 2009
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VSC8641 Datasheet
Functional Descriptions
The VSC8641 device is compatible with switch designs that are intended for use in
systems that supply power to Data Terminal Equipment (DTE) using the MDI or twisted
pair cable, as described in clause 33 of the IEEE standard 802.3af. The following
illustration shows an example of this type of application.
Figure 7.
Inline Powered Ethernet Switch Diagram
Gigabit Switch
RGMII
Interface
Processor
Control
SMI
PHY_0
PHY_1
PHY_n
Inline
Power
Supply Unit
X-former
X-former
X-former
RJ-45
I/F
RJ-45
I/F
RJ-45
I/F
Cat5
The following procedure describes the process that an Ethernet switch must perform to
process inline power requests made by a link partner (LP) that is, in turn, capable of
receiving inline power:
Revision 4.3
August 2009
1.
Enable the inline powered device detection mode on each VSC8641 PHY using its
serial management interface. Set register bit 23E.10 to 1.
2.
Ensure that the VSC8641 device auto-negotiation enable bit (register 0.12) is also
set to 1. In the application, the device sends a special Fast Link Pulse (FLP) signal
to the LP. Reading register bit 23E.9:8 returns 00 during the search for devices that
require Power-over-Ethernet (PoE).
3.
The VSC8641 PHY monitors its inputs for the FLP signal looped back by the LP. An
LP capable of receiving PoE will loopback the FLP pulses when it is in a powereddown state. This is reported when VSC8641 device register bit 23E.9:8 reads back
01. It can also be verified as an inline power detection interrupt by reading
VSC8641 device register bit 26.9, which should be a 1, and which is subsequently
Page 26
VSC8641 Datasheet
Functional Descriptions
cleared and the interrupt de-asserted after the read.
If an LP device does not loop back the FLP after a specific time, VSC8641 device
register bit 23E.9:8 automatically resets to 10.
3.10
4.
If the VSC8641 PHY reports that the LP needs PoE, the Ethernet switch must enable
inline power on this port, externally of the PHY.
5.
The PHY automatically disables inline powered device detection if the VSC8641
device register bit 23E.9:8 automatically resets to 10, and then automatically
changes to its normal auto-negotiation process. A link is then auto-negotiated and
established when the link status bit is set (register bit 1.2 is set to 1).
6.
In the event of a link failure (indicated when VSC8641 device register bit 1.2 reads
0), the inline power should be disabled to the inline powered device external to the
PHY. The VSC8641 PHY disables its normal auto-negotiation process and re-enables
its inline powered device detection mode.
ActiPHY Power Management
In addition to the IEEE-specified power-down control bit (device register bit 0.11), the
device also includes an ActiPHY™ power management mode for each PHY. This mode
enables support for power-sensitive applications such as laptop computers with Wakeon-LAN™ capability. It utilizes a signal-detect function that monitors the media
interface for the presence of a link to determine when to automatically power-down the
PHY. The PHY “wakes up” at a programmable interval and attempts to “wake up” the
link partner PHY by sending a burst of FLP over copper media.
The ActiPHY power management mode in the VSC8641 device can be enabled during
normal operation at any time by setting register bit 23.5 to 1.
There are three operating states possible when ActiPHY mode is enabled:
•
Low-power state
•
LP wake-up state
•
Normal operating state (link-up state)
The VSC8641 device switches between the low-power state and LP wake-up state every
two seconds until signal energy is detected on the media interface pins. When signal
energy is detected, the PHY enters the normal operating state. If the PHY is in its
normal operating state and the link fails, the PHY returns to the low-power state after
the link status time-out timer has expired. After reset, the PHY enters the low-power
state.
When auto-negotiation is enabled in the PHY, the ActiPHY state machine operates as
described. If auto-negotiation is disabled and the link is forced to 10BT or 100BTX
modes while the PHY is in its low-power state, the PHY continues to transition between
the low-power and LP wake-up states until signal energy is detected on the media pins.
At that time, the PHY transitions to the normal operating state and stays in that state
even when the link is dropped. If auto-negotiation is disabled while the PHY is in the
normal operation state, the PHY stays in that state when the link is dropped and does
not transition back to the low-power state.
The following illustration shows the relationship between ActiPHY states and timers.
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Figure 8.
ActiPHY State
Low-Power State
Signal Energy Detected on
Media
FLP Burst
Signal Sent
Sleep Timer Expires
Timeout Timer Expires and
Auto-Negotiation Enabled
LP Wake-up
State
3.10.1
Normal
Operation
Low-Power State
In the low-power state, all major digital blocks are powered down. However, the
following functionality is provided:
•
SMI interface (MDC, MDIO, MDINT)
•
CLKOUT
In this state, the PHY monitors the media interface pins for signal energy. The PHY
comes out of low-power state and transitions to the normal operating state when signal
energy is detected on the media. This happens when the PHY is connected to one of the
following:
•
Auto-negotiation capable link partner
•
Auto-negotiation incapable (blink/forced) link partner (100BASE-TX or 10BASE-T)
•
Another PHY in ActiPHY LP wake-up state
In the absence of signal energy on the media pins, the PHY transitions from the lowpower state to the LP wake-up state periodically based on the programmable sleep
timer (register bits 20E.14:13). The actual sleep time duration is randomized from –
80 ms to +60 ms to avoid two linked PHYs in ActiPHY Mode entering a lock-up state
during operation.
3.10.2
Link Partner Wake-Up State
In this state, the PHY attempts to wake up the link partner. FLP bursts are sent on
alternating pairs A and B of the Cat5 media for a duration of two seconds.
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In this state, the following functionality is provided:
•
SMI interface (MDC, MDIO, MDINT)
•
CLKOUT
After sending signal energy on the relevant media, the PHY returns to the low-power
state.
3.10.3
Normal Operating State
In this state, the PHY establishes a link with a link partner. When the media is
unplugged or the link partner is powered down, the PHY waits for the duration of the
programmable link status time-out timer, which is set using register bit 28.7 and
bit 28.2. It then enters the low-power state.
3.11
Serial Management Interface
The VSC8641 device includes an IEEE 802.3-compliant serial management interface
(SMI) that is affected by use of its MDC and MDIO pins. The SMI provides access to
device control and status registers. The register set that controls the SMI consists of 32
16-bit registers, including all required IEEE-specified registers. Also, there are
additional pages of registers accessible by means of device register 31.
For more information, see “Extended Page Registers,” page 58.
The SMI is a synchronous serial interface with bidirectional data on the MDIO pin that is
clocked on the rising edge of the MDC pin. The interface can be clocked at a rate from
0 MHz to 25 MHz, depending upon the total load on MDIO. An external, 2 kΩ pull-up
resistor is required on the MDIO pin.
3.11.1
SMI Frames
Data is transferred over the SMI using 32-bit frames with an optional and arbitrary
length preamble. The following illustrations show the SMI frame format for the read
operation and write operation.
Figure 9.
SMI Read Frame
Station Manager Drives MDIO
PHY Drives MDIO
MDC
MDIO
Z
Idle
Z
1
0
1
Preamble SFD
(optional)
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1
0
Read
A4
A3
A2
A1
PHY Address
A0
R4 R3 R2 R1 R0
Register Address
to PHY
Z
0
TA
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Register Data from PHY
Z
Z
Idle
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Figure 10.
SMI Write Frame
Station Manager Drives MDIO (PHY tristates MDIO during entire sequence)
MDC
MDIO
Z
Z
Idle
1
0
1
Preamble SFD
(optional)
0
1
Write
A4
A3
A2
A1
A0 R4 R3 R2 R1 R0
PHY Address
Register Address
to PHY
1
0
TA
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Register Data from PHY
Z
Z
Idle
The following provides additional information about the terms used in the illustrations.
Idle During idle, the MDIO node goes to a high-impedance state. This allows an
external pull-up resistor to pull the MDIO node up to a logical 1 state. Because the idle
mode should not contain any transitions on MDIO, the number of bits is undefined
during idle.
Preamble By default, preambles are not expected nor required. The preamble is a
string of ones. If it exists, the preamble must be at least one bit; otherwise, it may be
of an arbitrary length.
Start of Frame (SFD) A pattern of 01 indicates the start of frame. If the pattern is
not 01, all following bits are ignored until the next preamble pattern is detected.
Read or Write Opcode A pattern of 10 indicates a read. A pattern of 01 indicates a
write. If these bits are not either 01 or 10, all following bits are ignored until the next
preamble pattern is detected.
PHY Address The VSC8641 responds to a message frame only when the received
PHY address matches its physical address. The physical address is five bits long (4:0).
The bits are set by the CMODE pins.
Register Address
The next five bits are the register address.
Turn-around The two bits used to avoid signal contention when a read operation is
performed on the MDIO are called the turn-around (TA) bits. During read operations,
the VSC8641 device drives the second TA bit, which is a logical 0.
Data The 16-bits read from or written to the device are considered the data or data
stream. When data is read from a PHY, it is valid at the output from one rising edge of
MDC to the next rising edge of MDC. When data is being written to the PHY, it must be
valid around the rising edge of MDC.
Idle The sequence is repeated.
3.11.2
SMI Interrupts
The SMI also includes an output interrupt signal, MDINT, for signaling the station
manager when certain events occur in the PHY.
The MDINT pin can be configured for open-drain (active-low) by tying the pin to a pullup resistor and to VDDIO. The following illustration shows this configuration.
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Figure 11.
MDINT Configured as an Open-Drain (Active-Low) Pin
VDDIO
Interrupt Pin Enable
(MII Register 25.15)
MDINT
External Pull-up
at Station Manager
for Open-Drain
(Active Low Mode)
MDINT
(to Station Manager)
Interrupt Pin Status
(MII Register 26.15)
Alternatively, each MDINT pin can be configured for open-source (active-high) by tying
the pin to a pull-down resistor and to VSS. The following illustration shows this
configuration.
Figure 12.
MDINT Configured as an Open-Source (Active-High) Pin
VDDIO
Interrupt Pin Enable
(MII Register 25.15)
Interrupt Pin Status
(MII Register 26.15)
MDINT
MDINT
(to Station Manager)
External Pull-Down at
Station Manager
for Open Source
(Active-High Mode)
When a PHY generates an interrupt, the MDINT pin is asserted (driven high or low,
depending on resistor connection) if the interrupt pin enable bit (MII Register 25.15) is
set.
3.12
LED Interface
The VSC8641 device drives up to four LEDs directly. All LED outputs are active-low and
are driven using 3.3 V from the VDD33 power supply. When active, the pins are mainly
used to sink current of the cathode side of an LED, but the pins can also supply source
power to the anode portion of LEDs when they are not in the active state. This allows
for two LED pins to be used to drive a multi-status, bi-colored LED.
3.12.1
Simple or Enhanced LED Method
The VSC8641 provides two methods for controlling its LEDs: simple or enhanced. The
simple LED method is backward-compatible to the LED control found in prior Vitesse
Ethernet PHY devices. The simple LED method eases software backward compatibility
for customers switching to the VSC8641. The simple LED method is controlled by MII
Register 27 and is enabled by default.
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For added flexibility, the VSC8641 LED can be controlled using the enhanced LED
method. The enhanced LED method is enabled by setting MII Register 17E.4 = 1. When
enabled, then the LEDs are controlled by MII Registers 16E and 17E. In this method,
the MII Register 27 settings are ignored.
Simple LED Method When MII Register 17E.4 = 0, the LEDs are controlled by the
simple LED method. This LED method is enabled on power-up and is controlled by MII
Register 27. In this method, MII Register 27 controls the LEDs. For more information,
see “LED Control,” page 56.
Enhanced LED Method When MII Register 17E.4 = 1, the LEDs are controlled by the
enhanced LED method. In this method, MII Register 16E and 17E control the LEDs. For
more information, see “Enhanced LED Method Select,” page 59 and “Enhanced LED
Behavior,” page 60.
3.12.2
LED Modes
If you are using the enhanced LED method, there are several LED modes available.
They are found in MII Register 16E. Each LED pin can be configured to display different
status information. Set the LED mode either by using register 16E or with the
CMODE pin setting. The following table summarizes the LED functions.
Note The modes listed in the following table are equivalent to the setting used in
register 16E to configure each LED pin. For the LED states listed, 1 = pin held high (deasserted), 0 = pin held low (asserted), and blink/pulse-stretch is dependent on the LED
behavior setting in register 17E.
Table 3.
Mode
LED Mode and Function Summary
Function Name
LED State and Description
0
Link/activity
1 = No link in any speed on any media interface.
0 = Valid link at any speed on any media interface.
Blink or pulse-stretch = Valid link at any speed on any media interface and
with activity present.
1
Link1000/activity
1 = No link in 1000BASE-T.
0 = Valid 1000BASE-T link.
Blink or pulse-stretch = Valid 1000BASE-T link with activity present.
2
Link100/activity
1 = No link in 100BASE-TX.
0 = Valid 100BASE-TX link.
Blink or pulse-stretch = Valid 100BASE-TX link with activity present.
3
Link10/activity
1 = No link in 10BASE-T.
0 = Valid 10BASE-T link.
Blink or pulse-stretch = Valid 10BASE-T link with activity present.
4
Link100/1000/activity
1 = No link in 100BASE-TX or 1000BASE-T.
0 = Valid 100BASE-TX or 1000BASE-T link.
Blink or pulse-stretch = Valid 100BASE-TX or 1000BASE-T link with activity
present.
5
Link10/1000/activity
1 = No link in 10BASE-T or 1000BASE-T.
0 = Valid 10BASE-T or 1000BASET-T link.
Blink or pulse-stretch = Valid 10BASE-T or 1000BASE-T link with activity
present.
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Table 3.
Mode
LED Mode and Function Summary (continued)
Function Name
LED State and Description
6
Link10/100/activity
1 = No link in 10BASE-T or 100BASE-TX.
0 = Valid 10BASE-T or 100BASE-TX link.
Blink or pulse-stretch = Valid 10BASE-T or 100BASE-TX link with activity
present.
7
Reserved
8
Duplex/collision
1 = Link established in half-duplex mode, or no link established.
0 = Link established in full-duplex mode.
Blink or pulse-stretch = Link established in half-duplex mode but collisions are
present.
9
Collision
1 = No collision detected.
Blink or pulse-stretch = Collision detected.
10
Activity
1 = No activity present.
Blink or pulse-stretch = Activity present (becomes TX activity present if
register bit 30.14 is set to 1).
11
Reserved
12
Auto-negotiation fault
13
Reserved
14
Force LED off
1 = De-asserts the LED.
15
Force LED on
0 = Asserts the LED.
3.12.3
1 = No auto-negotiation fault present.
0 = Auto-negotiation fault occurred.
LED Behavior
Several LED behaviors can be programmed into the VSC8641 device. Use the settings
in register 17E to program LED behavior, which includes the following:
LED Combine Enables an LED to display status for a combination of primary and
secondary modes. This can be enabled or disabled for each LED pin. For example, a
copper link running in 1000BASE-T mode and activity present can be displayed with one
LED by configuring an LED pin to Link1000/Activity mode. The LED asserts when linked
to a 1000BASE-T partner and also blinks or pulse-stretches when activity is either
transmitted by the PHY or received by the link partner. The combine feature when
disabled only allows status of the primary function selected. In this example, only
Link1000 asserts the LED, and the secondary mode, activity, does not display if the
combine feature is disabled.
LED Blink or Pulse-Stretch This behavior is used for activity and collision indication.
This can be uniquely configured for each LED pin. Activity and collision events can occur
randomly and intermittently throughout the link-up period. For activity or collision to be
visually seen, these two modes are provided. Blink is a 50% duty cycle oscillation of
asserting and de-asserting an LED pin. Pulse-stretch guarantees that an LED is
asserted and de-asserted for a specific period of time when activity is either present or
not present. These rates can also be configured using a register setting.
Rate of LED Blink or Pulse-Stretch This controls the LED blink rate or pulse-stretch
length when blink/pulse-stretch is enabled on an LED pin. The blink rate, which
alternates between a high and low voltage level at a 50% duty cycle, can be set to
2.5 Hz, 5 Hz, 10 Hz, or 20 Hz. For pulse-stretch, this can be set to 50 ms, 100 ms,
200 ms, or 400 ms.
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LED Pulsing Enable To provide additional power savings, the LEDs (when asserted)
can be pulsed at 5 kHz, 20% duty cycle.
3.13
Testing Features
The VSC8641 device includes several testing features designed to make it easier to
perform system-level debugging and in-system production testing. This section
describes the available features.
3.13.1
Ethernet Packet Generator (EPG)
The device EPG can be used at each of the 10/100/1000BASE-T speed settings to
isolate problems between the MAC and the VSC8641 device, or between a locally
connected PHY and its remote link partner. Enabling the EPG feature effectively disables
all MAC interface transmit pins and selects the EPG as the source for all data
transmitted onto the twisted pair interface.
Note The EPG is intended for use with laboratory or in-system testing equipment only.
Do not use the EPG testing feature when the VSC8641 device is connected to a live
network.
To enable the VSC8641 device EPG feature, set the device register bit 29E.15 to 1.
When the EPG is enabled, packet loss occurs during transmission of packets from the
MAC to the PHY. However, the PHY receive output pins to the MAC are still active when
the EPG is enabled. If it is necessary to disable the MAC receive pins as well, set
register bit 0.10 to 1.
When the device register bit 29E.14 is set to 1, the PHY begins transmitting Ethernet
packets based on the settings in registers 29E and 30E. These registers set:
•
Source and destination addresses for each packet
•
Packet size
•
Inter-packet gap
•
FCS state
•
Transmit duration
•
Payload pattern
If register bit 29E.13 is set to 0, register bit 29E.14 is cleared automatically after
30,000,000 packets are transmitted.
3.13.2
CRC Counters
Two separate cyclical redundancy checking (CRC) counters are available in the
VSC8641 device. There is a 14-bit CRC good counter available in register bits 18E.13:0
and a separate 8-bit CRC error counter available in register bits 23E.7:0.
The device CRC counters operate in 10/100/1000BASE-T testing as follows:
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3.13.3
•
After receiving a packet on the media interface, register bit 18E.15 is set and
cleared after being read. The packet then is counted by either the CRC good
counter or the CRC error counter. Both CRC counters are also automatically cleared
when read.
•
The CRC good counter’s highest value is 9,999 packets. Upon receiving the next
packet, the counter clears and continues to count additional packets beyond that
value. The CRC error counter saturates when it reaches its maximum counter limit
of 255 packets.
Far-end Loopback
The far-end loopback testing feature is enabled by setting register bit 27E.10 to 1.
When enabled, it forces incoming data from a link partner on the current media
interface to be retransmitted back to the link partner on the media interface as shown
in the following illustration. In addition, the incoming data also appears on the receive
data pins of the MAC interface. Data present on the transmit data pins of the MAC
interface is ignored when using this testing feature.
Figure 13.
Far-End Loopback
Link Partner
SimpliPHY
Cat5
3.13.4
RX
RXD
TX
TXD
MAC
Near-End Loopback
When the near-end loopback testing feature is enabled (by setting the device register
bit 0.14 to 1), data on the transmit data pins (TXD) is looped back onto the device
received data pins (RXD) as shown in the following illustration. When using this testing
feature, no data is transmitted over the network.
Figure 14.
Near-End Loopback
Link Partner
SimpliPHY
Cat5
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MAC
RX
RXD
TX
TXD
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Functional Descriptions
3.13.5
Connector Loopback
The connector loopback testing feature allows for the twisted pair interface to be looped
back externally. When using this feature, the PHY must be connected to a loopback
connector or a loopback cable. Pair A should be connected to pair B and pair C to
pair D, as shown in the following illustration. The connector loopback feature functions
at all available interface speeds.
Figure 15.
Connector Loopback
RXD
A
Cat5
B
SimpliPHY
MAC
C
D
TXD
When using the connector loopback testing feature, the device auto-negotiation, speed,
and duplex configuration is set using device registers 0, 4, and 9. For 1000BASE-T
connector loopback, only the following additional writes are required. Execute the
additional writes in the following order:
3.13.6
1.
Enable the 1000BASE-T connector loopback. Set register bit 24.0 to 1.
2.
Disable the pair swap correction. Set register bit 18.5 to 1.
VeriPHY Cable Diagnostics
The VSC8641 device includes a comprehensive suite of cable diagnostic functions that
are available using SMI reads and writes. These functions enable a variety of cable
operating conditions and status to be accessed and checked. The VeriPHY suite has the
ability to identify the cable length and operating conditions and to isolate a variety of
common faults that can occur on the Cat5 twisted pair cabling.
For more information, see the PHY API Software and Programmers Guide on the Vitesse
Web site at www.vitesse.com.
Note If a link is established on the twisted pair interface in 1000BASE-T mode,
VeriPHY can run without disrupting the link or any data transfer. However, if a link is
established in 100BASE-TX or 10BASE-T, VeriPHY causes the link to drop while the
diagnostics are running. After the diagnostics are finished, the link is then reestablished.
The following diagnostic functions are part of the VeriPHY suite:
•
Detection of coupling between cable pairs
•
Detection of cable pair termination
•
Determination of cable length
Coupling Between Cable Pairs Shorted wires, improper termination, or high
crosstalk resulting from an incorrect wire map can cause error conditions, such as
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Functional Descriptions
anomalous coupling between cable pairs. These conditions can all prevent the device
from establishing a link at any speed.
Cable Pair Termination Proper termination of Cat5 cable requires 100-Ω differential
impedance between the positive and negative cable terminals. The IEEE standard 802.3
allows for a termination of as high as 115 Ω or as low as 85 Ω. If the termination falls
outside of this range, it is reported by the VeriPHY diagnostics as an anomalous
termination. The diagnostics can also determine the presence of an open or shorted
cable pair.
Cable Length When the Cat5 cable in an installation is properly terminated, VeriPHY
reports the approximate cable length in meters.
3.13.7
IEEE 1149.1 JTAG Boundary Scan
The VSC8641 device supports the Test Access Port (TAP) and boundary-scan
architecture described in the IEEE standard 1149.1. The device includes an
IEEE 1149.1-compliant test interface, often referred to as a “JTAG TAP Interface.”
The JTAG boundary-scan logic on the VSC8641 device, accessed using its TAP interface,
consists of a boundary-scan register and other logic control blocks. The TAP controller
includes all IEEE-required signals (TMS, TCK, TDI, and TDO), in addition to the optional
asynchronous reset signal NTRST.
The following illustration shows the TAP and boundary-scan architecture.
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Figure 16.
Test Access Port and Boundary-Scan Architecture
Boundary-Scan
Register
Device Identification
Register
Bypass Register
Control
Instruction Register,
Instruction Decode,
Control
TDI
TMS
NTRST
Mux,
DFF
TDO
Control
Test Access Port
Controller
Select
tdoenable
TCK
After a TAP reset, the Device Identification register is serially connected between TDI
and TDO by default. The TAP Instruction register is loaded either from a shift register
(when a new instruction is shifted in) or, if there is no new instruction in the shift
register, a default value of 0110 (IDCODE) is loaded. Using this method, there is always
a valid code in the instruction register, and the problem of toggling instruction bits
during a shift is avoided. Unused codes are mapped to the BYPASS instruction.
3.13.8
JTAG Instruction Codes
The VSC8641 device supports the following instruction codes.
EXTEST Allows testing of off-chip circuitry and board-level interconnections by
sampling input pins and loading data onto output pins. Outputs are driven by the
contents of the boundary-scan cells, which have to be updated with valid values (with
the PRELOAD instruction) prior to the EXTEST instruction.
SAMPLE/PRELOAD Allows a snapshot of inputs and outputs during normal system
operation to be taken and examined. It also allows data values to be loaded into the
boundary-scan cells prior to the selection of other boundary-scan test instructions.
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IDCODE Provides the version number (bits 31:28), part number (bits 27:12), and the
manufacturer identity (bits 11:1) to be serially read from the device.
The following table provides information about the meaning of IDCODE binary values
stored in the device JTAG registers.
Table 4.
JTAG Device Identification Register Description
Device Version
Number
Model Number
Manufacturing
Identity
Bit field
31 through 28
27 through 12
11 through 1
0
Binary value
0001
1000 0110 0100 0001
000 0111 0100
1
Description
LSB
CLAMP Allows the state of the signals driven from the component pins to be
determined from the boundary-scan register while the bypass register is selected as the
serial path between TDI and TDO. While the CLAMP instruction is selected, the signals
driven from the component pins do not change.
HIGHZ Places the component in a state in which all of its system logic outputs are
placed in a high impedance state. In this state, an in-circuit test system may drive
signals onto the connections normally driven by a component output without incurring a
risk of damage to the component. This makes it possible to use a board where not all of
the components are compatible with the IEEE 1149.1 standard.
BYPASS The bypass register contains a single shift-register stage and is used to
provide a minimum-length serial path (one TCK clock period) between TDI and TDO to
bypass the device when no test operation is required.
The following table provides more information about the location and IEEE compliance
of the JTAG instruction codes used in the VSC8641.
Table 5.
3.13.9
JTAG Interface Instruction Codes
Instruction
Code
Selected Register
Register
Width
IEEE 1149.1
Specification
EXTEST
0000
Boundary-scan
69
Mandatory
SAMPLE/PRELOAD
0001
Boundary-scan
69
Mandatory
IDCODE
0110
Device identification
32
Optional
CLAMP
0010
Bypass register
1
Optional
HIGHZ
0011
Bypass register
1
Optional
BYPASS
1111
Bypass register
1
Mandatory
RESERVED
0100, 0101,
0111, 1000-1110
Boundary-Scan Register Cell Order
All inputs and outputs are observed in the boundary-scan register cells. All outputs are
additionally driven by the contents of boundary-scan register cells. Bidirectional pins
have all three related boundary-scan register cells: input, output, and control.
The complete boundary-scan cell order is available as a BSDL file format on the Vitesse
Web site at www.vitesse.com.
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Configuration
4
Configuration
The VSC8641 device can be configured using three different methods:
4.1
•
Setting internal memory registers using the management interface.
•
Setting a combination of CMODE pins and registers.
•
Loading a configuration into an external EEPROM and connecting that device so that
it writes configuration information at system startup.
Registers
This section provides information about how to configure the VSC8641 device using its
internal memory registers and the management interface. For information about
configuring the device using the CMODE pins, see “CMODE,” page 68. For information
about setting up an external EEPROM to perform startup configuration, see “EEPROM,”
page 70.
The following illustration shows the relationship between the device registers and their
address spaces.
Figure 17.
Register Space Diagram
0
1
2
3
.
.
.
.
.
.
.
.
15
16
17
18
19
.
.
.
.
.
.
.
.
30
31
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IEEE 802.3
Standard
Registers
Main
Registers
Extended Page
Registers
0x0000
0x0001
16E
17E
18E
19E
.
.
.
.
.
.
.
.
30E
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VSC8641 Datasheet
Configuration
4.1.1
Reserved Registers
For main registers 16 through 31 and extended page registers 16E through 30E, any
bits marked as “Reserved” should be processed as read only and their states as
undefined.
4.1.2
Reserved Bits
In writing to registers with reserved bits, use a “read-modify-then-write” technique,
where the entire register is read but only the intended bits to be changed are modified.
Reserved bits cannot be changed and their read state cannot be considered static or
unchanging.
4.2
IEEE Standard and Main Registers
In the VSC8641 device, the standard registers’ page space consists of the IEEE
standard registers and the Vitesse standard registers. The following table lists the
names of the registers associated with the addresses as dictated by the IEEE standard.
Table 6.
IEEE 802.3 Standard Registers
Register Address
Register Name
0
Mode control
1
Mode status
2
PHY identifier 1
3
PHY identifier 2
4
Auto-negotiation advertisement
5
Auto-negotiation link partner ability
6
Auto-negotiation expansion
7
Auto-negotiation next-page transmit
8
Auto-negotiation link partner next-page receive
9
1000BASE-T control
10
1000BASE-T status
11
Reserved
12
Reserved
13
Reserved
14
Reserved
15
1000BASE-T status extension 1
The following table lists the names of the registers in the main page space of the
device. These registers are accessible only when register address 31 is set to 0x0000.
Table 7.
Main Registers
Register Address
Revision 4.3
August 2009
Register Name
16
100BASE-TX status extension
17
1000BASE-T status extension 2
Page 41
VSC8641 Datasheet
Configuration
Table 7.
Main Registers (continued)
Register Address
4.2.1
Register Name
18
Bypass control
19
Receive error counter
20
False carrier sense counter
21
Disconnect counter
22
Extended control and status
23
Extended PHY control 1
24
Extended PHY control 2
25
Interrupt mask
26
Interrupt status
27
LED control
28
Auxiliary control and status
29
Delay skew status
30
Reserved
31
Extended register page access
Mode Control
The device register at memory address 0.00.15:0 controls several aspects of VSC8641
functionality. The following table lists the available bit settings in this register and what
they control.
Table 8.
Revision 4.3
August 2009
Mode Control, Address 0 (0x00)
Bit
Name
15
Software reset
Access
R/W
Description
This is a self-clearing bit that restores all
serial management interface (SMI) registers
to their default state, except for sticky and
super sticky bits.
1 = Reset asserted.
0 = Reset de-asserted.
You must wait 4 µs after setting this bit to
initiate another SMI register access.
Default
0
14
Loopback
R/W
1 = Loopback enabled.
0 = Loopback disabled.
When loop back is enabled, the device
functions at the current speed setting and
with the current duplex mode setting (bit 8
of this register).
0
13, 6
Forced speed
selection
R/W
LSB = bit 13, MSB = bit 6.
00 = 10 Mbps.
01 = 100 Mbps.
10 = 1000 Mbps.
11 = Reserved.
12
Auto-negotiation
enable
R/W
1 = Auto-negotiation enabled.
0 = Auto-negotiation disabled.
10
1
Page 42
VSC8641 Datasheet
Configuration
Table 8.
4.2.2
Mode Control, Address 0 (0x00) (continued)
Bit
Name
Access
Description
Default
11
Power-down
R/W
1 = Power-down enabled.
If power-down is enabled, the RGMII’s inband signaling is disabled. When this bit is
set, RGMII in-band signaling does not
function.
0
10
Isolate
R/W
1 = Disable MAC interface outputs and
ignore MAC interface inputs.
0
9
Restart autonegotiation
R/W
This is a self-clearing bit.
1 = Restart auto-negotiation on media
interface.
0
8
Duplex
R/W
1 = Full-duplex.
0 = Half-duplex.
0
7
Collision test enable
R/W
1 = Collision test enabled.
0
6
MSB for speed
selection
R/W
See bit 13 above.
1
5:0
Reserved
000000
Mode Status
The register at 1.01.15:0 in the device main registers space displays the currently
enabled mode setting. The following table lists possible readouts of this register.
Table 9.
Revision 4.3
August 2009
Mode Status, Address 1 (0x01)
Bit
Name
Access
Description
15
100BASE-T4
capability
RO
1 = 100BASE-T4 capable.
0
14
100BASE-X FDX
capability
RO
1 = 100BASE-X FDX capable.
1
13
100BASE-X HDX
capability
RO
1 = 100BASE-X DDX capable.
1
12
10BASE-T FDX
capability
RO
1 = 10BASE-T FDX capable.
1
11
10BASE-T HDX
capability
RO
1 = 10BASE-T HDX capable.
1
10
100BASE-T2 FDX
capability
RO
1 = 100BASE-T2 FDX capable.
0
9
100BASE-T2 HDX
capability
RO
1 = 100BASE-T2 HDX capable.
0
8
Extended status
enable
RO
7
Reserved
RO
6
Preamble
suppression
capability
RO
1 = MF preamble may be suppressed.
0 = MF always required.
1
5
Auto-negotiation
complete
RO
1 = Auto-negotiation complete.
0
1 = Extended status information present in
register 15.
Default
1
0
Page 43
VSC8641 Datasheet
Configuration
Table 9.
4.2.3
Mode Status, Address 1 (0x01) (continued)
Bit
Name
Access
Description
Default
4
Remote fault
RO
This bit latches high.
1 = Far-end fault detected.
0
3
Auto-negotiation
capability
RO
1 = Auto-negotiation capable.
1
2
Link status
RO
This bit latches low.
1 = Link is up.
0
1
Jabber detect
RO
This bit latches high.
1 = Jabber condition detected.
0
0
Extended capability
RO
1 = Extended register capable.
1
Device Identification
All 16 bits in both register 2 and register 3 in the VSC8641 device are used to provide
information associated with aspects of the device identification. The following tables list
the possible readouts.
Table 10.
Table 11.
4.2.4
Identifier 1, Address 2 (0x02)
Bit
Name
15:0
Organizationally
unique identifier
(OUI)
Access
RO
Description
Default
OUI most significant bits (3:18)
0x0007
Identifier 2, Address 3 (0x03)
Bit
Name
Access
Description
Default
15:10
OUI
9:4
Vitesse model
number
RO
OUI least significant bits (19:24)
000001
RO
VSC8641
000011
3:0
Device revision
number
RO
0001
Auto-Negotiation Advertisement
The bits in address 4 in the main registers space control the VSC8641 device ability to
notify other devices of the status of its auto-negotiation feature. The following table
lists the available settings and readouts.
Table 12.
Revision 4.3
August 2009
Device Auto-Negotiation Advertisement, Address 4 (0x04)
Bit
Name
15
Next page
transmission
request
14
Reserved
13
Transmit remote
fault
Access
R/W
Description
1 = Request enabled
RO
R/W
Default
0
0
1 = Enabled
0
Page 44
VSC8641 Datasheet
Configuration
Table 12.
4.2.5
Device Auto-Negotiation Advertisement, Address 4 (0x04)
Bit
Name
Access
Description
Default
12
Reserved
technologies
R/W
11
Advertise
asymmetric pause
R/W
1 = Advertises asymmetric pause
CMODE
10
Advertise symmetric
pause
R/W
1 = Advertises symmetric pause
CMODE
9
Advertise
100BASE-T4
R/W
1 = Advertises 100BASE-T4
8
Advertise
100BASE-TX FDX
R/W
1 = Advertise 100BASE-TX FDX
CMODE
7
Advertise
100BASE-TX HDX
R/W
1 = Advertises 100BASE-TX HDX
CMODE
6
Advertise
10BASE-T FDX
R/W
1 = Advertises 10BASE-T FDX
CMODE
5
Advertise
10BASE-T HDX
R/W
1 = Advertises 10BASE-T HDX
CMODE
4:0
Advertise selector
R/W
0
0
00001
Link Partner Auto-Negotiation Capability
The bits in main register 5 enable you to determine if the Cat5 link partner (LP) used
with the VSC8641 device is compatible with the auto-negotiation functionality.
Table 13.
Revision 4.3
August 2009
Auto-Negotiation Link Partner Ability, Address 5 (0x05)
Bit
Name
15
LP next page
transmission
request
Access
RO
1 = Requested
Description
Default
0
14
LP acknowledge
RO
1 = Acknowledge
0
13
LP remote fault
RO
1 = Remote fault
0
12
Reserved
RO
11
LP advertise
asymmetric pause
RO
1 = Capable of asymmetric pause
0
0
10
LP advertise
symmetric pause
RO
1 = Capable of symmetric pause
0
9
LP advertise
100BASE-T4
RO
1 = Capable of 100BASE-T4
0
8
LP advertise
100BASE-TX FDX
RO
1 = Capable of 100BASE-TX FDX
0
7
LP advertise
100BASE-TX HDX
RO
1 = Capable of 100BASE-TX HDX
0
6
LP advertise
10BASE-T FDX
RO
1 = Capable of 10BASE-T FDX
0
5
LP advertise
10BASE-T HDX
RO
1 = Capable of 10BASE-T HDX
0
4:0
LP advertise selector
RO
00000
Page 45
VSC8641 Datasheet
Configuration
4.2.6
Auto-Negotiation Expansion
The bits in main register 6 work together with those in register 5 to indicate the status
of the LP auto-negotiation. The following table lists the available settings and readouts.
Table 14.
4.2.7
Auto-Negotiation Expansion, Address 6 (0x06)
Bit
Name
15:5
Reserved
Access
RO
Description
Default
4
Parallel detection
fault
RO
This bit latches high.
1 = Parallel detection fault.
0
3
LP next page
capable
RO
1 = LP is next page capable.
0
2
Local PHY next page
capable
RO
1 = Local PHY is next page capable.
1
1
Page received
RO
This bit latches low.
1 = New page has been received.
0
0
LP is autonegotiation capable
RO
1 = LP is capable of auto-negotiation.
0
00000000000
Transmit Auto-Negotiation Next Page
The settings in register 7 in the main registers space provide information about the
number of pages in an auto-negotiation sequence. The following table lists the settings
available.
Table 15.
4.2.8
Auto-Negotiation Next Page Transmit, Address 7 (0x07)
Bit
Name
15
Next page
Access
R/W
Description
Default
1 = More pages follow
0
14
Reserved
13
Message page
R/W
RO
1 = Message page
0 = Unformatted page
1
12
Acknowledge 2
R/W
1 = Complies with request
0 = Cannot comply with request
0
11
Toggle
1 = Previous transmitted LCW = 0
0 = Previous transmitted LCW = 1
0
10:0
Message/unformatted
code
RO
0
R/W
00000000001
Auto-Negotiation Link Partner Next Page Receive
The bits in register 8 of the main register space work together with register 7 to
determine certain aspects of the LP auto-negotiation. The following table lists the
possible readouts.
Table 16.
Revision 4.3
August 2009
Auto-Negotiation LP Next Page Receive, Address 8 (0x08)
Bit
Name
15
LP next page
Access
RO
Description
1 = More pages follow
Default
0
Page 46
VSC8641 Datasheet
Configuration
Table 16.
4.2.9
Auto-Negotiation LP Next Page Receive, Address 8 (0x08) (continued)
Bit
Name
Access
Description
Default
14
Acknowledge
RO
1 = LP acknowledge
0
13
LP message page
RO
1 = Message page
0 = Unformatted page
0
12
LP Acknowledge 2
RO
1 = LP complies with request
0
11
LP toggle
RO
1 = Previous transmitted LCW = 0
0 = Previous transmitted LCW = 1
0
10:0
LP message /
unformatted code
RO
00000000000
1000BASE-T Control
The VSC8641 device’s 1000BASE-T functionality is controlled by the bits in register 9 of
the main register space. The following table lists the settings and readouts available.
Table 17.
1000BASE-T Control, Address 9 (0x09)
Bit
Name
Access
Description
15:13
Transmitter
test mode
R/W
000
001
010
011
100
101
12
Master/slave
manual
configuration
R/W
1 = Master/slave manual configuration enabled.
0
11
Master/slave
value
R/W
This register is only valid when bit 9.12 is set to 1.
1 = Configure PHY as master during negotiation.
0 = Configure PHY as slave during negotiation.
0
10
Port type
R/W
1 = Multi-port device.
0 = Single-port device.
0
9
1000BASE-T
FDX capability
R/W
1 = PHY is 1000BASE-T FDX capable.
CMODE
8
1000BASE-T
HDX capability
R/W
1 = PHY is 1000BASE-T HDX capable.
CMODE
7:0
Reserved
R/W
= Normal.
= Mode 1: Transmit waveform test.
= Mode 2: Transmit jitter test as master.
= Mode 3: Transmit jitter test as slave.
= Mode 4: Transmitter distortion test.
to 111 = Reserved: Operation not defined.
Default
000
0x00
Note Transmitter Test Mode (bits 15:13) operates in the manner described in IEEE
standard 802.3, section 40.6.1.1.2.
Revision 4.3
August 2009
Page 47
VSC8641 Datasheet
Configuration
4.2.10
1000BASE-T Status
The bits in register 10 of the main register space allow you to read the status of the
1000BASE-T communications enabled in the device. The following table lists these
readouts.
Table 18.
4.2.11
1000BASE-T Status, Address 10 (0x0A)
Bit
Name
15
Master/slave
configuration fault
Access
RO
This bit latches high.
1 = Master/slave configuration fault
detected.
0 = No master/slave configuration fault
detected.
Description
Default
0
14
Master/slave
configuration
resolution
RO
1 = Local PHY configuration resolved to
master.
0 = Local PHY configuration resolved to
slave.
1
13
Local receiver status
RO
1 = Local receiver okay.
0
12
Remote receiver
status
RO
1 = Remote receiver OK.
0
11
LP 1000BASE-T FDX
capability
RO
1 = LP 1000BASE-T FDX capable.
0
10
LP 1000BASE-T HDX
capability
RO
1 = LP 1000BASE-T HDX capable.
0
9:8
Reserved
RO
7:0
Idle error count
RO
00
This is a self-clearing bit.
0x00
Main Registers Reserved Addresses
In the VSC8641 device main registers page space, registers 11 through 15 (0x0B
through 0x0E) are reserved.
4.2.12
1000BASE-T Status Extension 1
Register 15 provides additional information about the operation of the device
1000BASE-T communications. The following table lists the readouts available.
Table 19.
Revision 4.3
August 2009
1000BASE-T Status Extension 1, Address 15 (0x0F)
Bit
Name
Access
Description
Default
15
1000BASE-X FDX
capability
RO
1 = PHY is 1000BASE-X FDX capable
0
14
1000BASE-X HDX
capability
RO
1 = PHY is 1000BASE-X HDX capable
0
13
1000BASE-T FDX
capability
RO
1 = PHY is 1000BASE-T FDX capable
1
12
1000BASE-T HDX
capability
RO
1 = PHY is 1000BASE-T HDX capable
1
11:0
Reserved
RO
0x000
Page 48
VSC8641 Datasheet
Configuration
4.2.13
100BASE-TX Status Extension
Register 16 in the main registers page space of the VSC8641 device provides additional
information about the status of the device’s 100BASE-TX operation.
Table 20.
4.2.14
100BASE-TX Status Extension, Address 16 (0x10)
Bit
Name
15
100BASE-TX
descrambler
Access
RO
1 = Descrambler locked.
Description
Default
0
14
100BASE-TX lock
error
RO
This is a self-clearing bit.
1 = Lock error detected.
0
13
100BASE-TX
disconnect state
RO
This is a self-clearing bit.
1 = PHY 100BASE-TX link disconnect
detected.
0
12
100BASE-TX current
link status
RO
1 = PHY 100BASE-TX link active.
0
11
100BASE-TX receive
error
RO
This is a self-clearing bit.
1 = Receive error detected.
0
10
100BASE-TX
transmit error
RO
This is a self-clearing bit.
1 = Transmit error detected.
0
9
100BASE-TX SSD
error
RO
This is a self-clearing bit.
1 = Start-of-stream delimiter error detected.
0
8
100BASE-TX ESD
error
RO
This is a self-clearing bit.
1 = End-of-stream delimiter error detected.
0
7:0
Reserved
RO
1000BASE-T Status Extension 2
The second status extension register is at address 17 in the device main registers
space. It provides information about another set of parameters associated with
1000BASE-T communications. For information about the first status extension register,
see Table 20, page 49. The following table lists the settings available.
Table 21.
Revision 4.3
August 2009
1000BASE-T Status Extension 2, Address 17 (0x11)
Bit
Name
15
1000BASE-T
descrambler
Access
RO
Description
1 = Descrambler locked.
Default
0
14
1000BASE-T lock
error
RO
This is a self-clearing bit.
1 = Lock error detected.
0
13
1000BASE-T
disconnect state
RO
This is a self-clearing bit.
1 = PHY 1000BASE-T link disconnect
detected.
0
12
1000BASE-T current
link status
RO
1 = PHY 1000BASE-T link active.
0
11
1000BASE-T receive
error
RO
This is a self-clearing bit.
1 = Receive error detected.
0
10
1000BASE-T
transmit error
RO
This is a self-clearing bit.
1 = Transmit error detected.
0
Page 49
VSC8641 Datasheet
Configuration
Table 21.
4.2.15
1000BASE-T Status Extension 2, Address 17 (0x11) (continued)
Bit
Name
Access
Description
Default
9
1000BASE-T SSD
error
RO
This is a self-clearing bit.
1 = Start-of-stream delimiter error detected.
0
8
1000BASE-T ESD
error
RO
This is a self-clearing bit.
1 = End-of-stream delimiter error detected.
0
7
1000BASE-T carrier
extension error
RO
This is a self-clearing bit.
1 = Carrier extension error detected.
0
6
Non-compliant
BCM5400 detected
RO
1 = Non-compliant BCM5400 detected.
0
5
MDI crossover error
RO
1 = MDI crossover error detected.
0
4:0
Reserved
RO
Bypass Control
The bits in the Bypass Control register in the VSC8641 device control aspects of
functionality in effect when the device is disabled so that traffic can bypass it in your
design. The following table lists the settings available.
Table 22.
Revision 4.3
August 2009
Bypass Control, Address 18 (0x12)
Bit
Name
15
Transmit disable
Access
R/W
Description
Default
1 = PHY transmitter disabled.
0
14:9
Reserved
8
1000BASE-T
transmitter test
clock
R/W
RO
1 = Enabled.
0
7
Force non-compliant
BCM5400 detection
R/W
This is a sticky bit.
1 = Force non-compliant BCM5400
detection.
0
6
Non-compliant
BCM5400 detection
disable
R/W
This is a sticky bit.
1 = Non-compliant BCM5400 detection
disable.
1
5
Disable pair swap
correction
R/W
This is a sticky bit.
1 = Disable the automatic pair swap
correction.
0
4
Disable polarity
correction
R/W
This is a sticky bit.
1 = Disable polarity inversion correction on
each subchannel.
0
3
Parallel detect
control
R/W
This is a sticky bit.
1 = Do not ignore advertised ability.
0 = Ignore advertised ability.
1
2
Reserved
1
Disable automatic
1000BASE-T next
page exchange
R/W
This is a sticky bit.
1 = Disable automatic 1000BASE-T next
page exchanges.
0
0
CLKOUT output
enable
R/W
This is a sticky bit.
1 = Enable clock output pin.
RO
CMODE
Page 50
VSC8641 Datasheet
Configuration
Note If bit 1 is set to 1 in this register, automatic exchange of next pages is disabled,
and control is returned to the user through the SMI after the base page is exchanged.
The user then must send the correct sequence of next pages to the link partner,
determine the common capabilities, and force the device into the correct configuration
following the successful exchange of pages.
4.2.16
Receive Error Counter
The following table lists the readouts you can expect.
Table 23.
Receive Error Counter, Address 19 (0x13)
Bit
Name
15:8
Reserved
Access
RO
7:0
Receive error
counter
RO
Description
Default
00000000
This is a self-clearing bit.
Counts the number of non-collision
packets with receive errors since last
read. Each time the PHY detects a noncollision packet containing at least one
error, these bits are incremented. The
counter stops counting at 0FFh.
00000000
This register is cleared only when read,
or upon either a hardware or software
reset. These bits are valid only in
100BASE-TX and 1000BASE-T modes.
4.2.17
False Carrier Sense Counter
The following table lists the readouts you can expect.
Table 24.
False Carrier Sense Counter, Address 20 (0x14)
Bit
Name
Access
15:8
Reserved
RO
7:0
False carrier
sense counter
RO
Description
Default
00000000
This is a self-clearing bit.
Counts the number of false carrier
events since last read. The PHY
increments these bits each time it
detects a false carrier on the receive
input. The counter stops counting at
0FFh.
00000000
This register is cleared only when read,
or upon either a hardware or software
reset. These bits are valid only in
100BASE-TX and 1000BASE-T modes.
Revision 4.3
August 2009
Page 51
VSC8641 Datasheet
Configuration
4.2.18
Disconnect Counter
The following table lists the readouts you can expect.
Table 25.
4.2.19
Disconnect Counter, Address 21 (0x15)
Bit
Name
Access
15:8
Reserved
RO
7:0
Disconnect
counter
RO
Description
Default
00000000
This is a self-clearing bit.
Counts the number of non-collision
packets with receive errors after the last
read. The PHY increments these bits
each time the Carrier Integrity Monitor
(CIM) enters the link unstable state. The
counter stops counting at 0FFh. This
register is cleared only when read or
upon a hardware or software reset.
00000000
Extended Control and Status
The bits in register 22 provide additional device control and readouts. The following
table lists the settings available.
Table 26.
Extended Control and Status, Address 22 (0x16)
Bit
Name
15
Force 10BASE-T
link high
Access
R/W
This is a sticky bit.
1 = Bypass link integrity test.
0 = Enable link integrity test.
Description
Default
0
14
Jabber detect
disable
R/W
This is a sticky bit.
1 = Disable jabber detect.
0
13
Disable 10BASE-T
echo
R/W
This is a sticky bit.
1 = Disable 10BASE-T echo.
1
12
SQE disable mode
R/W
1 = Disable SQE transmit.
11:10
10BASE-T squelch
control
R/W
This is a sticky bit.
00 = Normal squelch.
01 = Low squelch.
10 = High squelch.
11 = Reserved.
9
Reserved
8
EOF Error
RO
This bit is self-clearing.
1 = EOF error detected.
0
7
10BASE-T
disconnect state
RO
This bit is self-clearing.
1 = 10BASE-T link disconnect detected.
0
6
10BASE-T link
status
RO
1 = 10BASE-T link active.
0
5:0
Reserved
RO
1
00
The following information applies to the extended control and status bits:
•
Revision 4.3
August 2009
When bit 15 is set, the link integrity state machine is bypassed and the PHY is
forced into a link pass status.
Page 52
VSC8641 Datasheet
Configuration
•
4.2.20
When bits 11:0 are set to 00, the squelch threshold levels are based on the IEEE
standard for 10BASE-T. When set to 01, the squelch level is decreased, which may
improve the bit error rate performance on long loops. When set to 10, the squelch
level is increased and may improve the bit error rate in high-noise environments.
Extended PHY Control Set 1
The bits in the extended control set control the MAC auto-negotiation functioning,
SGMII alignment errors, and EEPROM status. The following table lists the settings
available.
Table 27.
Extended PHY Control 1, Address 23 (0x17)
Bit
Name
15:13
Reserved
12
MAC interface mode
select
11:9
Reserved
8
RGMII skew timing
compensation
enable
7:6
Reserved
5
ActiPHY mode
enable
4:2
Reserved
1
GMII transmit pin
reversal
0
Reserved
Access
Description
Default
This is a super-sticky bit.
0 = GMII MAC interface mode.
1 = RGMII MAC interface mode.
CMODE
This is a sticky bit.
0 = Disabled.
1 = Adds 1.7 ns delay to the RX_CLK and
TX_CLK pins.
Note There is a design consideration
associated with this register. For more
information, see “Setting the Internal
RGMII Timing Compensation Value,”
page 121.
CMODE
This is a sticky bit.
1 = Enabled.
CMODE
RO
R/W
RO
R/W
RO
R/W
RO
R/W
This is a sticky bit.
0 = GMII transmit pin order default.
1 = GMII transmit pin order reversed.
0
RO
Note After configuring bit 12 of the extended PHY control register set 1, a software
reset (register 0, bit 15) must be written to change the device operating mode. Bit 1
allows for flexibility in printed circuit board layouts because it can reorder the TXD pins.
Revision 4.3
August 2009
Page 53
VSC8641 Datasheet
Configuration
4.2.21
Extended PHY Control Set 2
The second set of extended controls is located in register 24 in the main register space
for the device. The following table lists the settings and readouts available.
Table 28.
4.2.22
Extended PHY Control 2, Address 24 (0x18)
Bit
Name
15:13
100BASE-TX edge
rate control
Access
R/W
12:4
Reserved
RO
3:1
Cable length status
RO
0
1000BASE-T
connector loopback
R/W
Description
Default
This is a sticky bit.
011 = +5 Edge rate (slowest).
010 = +4 Edge rate.
001 = +3 Edge rate.
000 = +2 Edge rate.
111 = +1 Edge rate.
110 = Default edge rate.
101 = –1 Edge rate.
100 = –2 Edge rate (fastest).
110
The following are approximate lengths:
000 = < 10 m.
001 = 10—20 m.
010 = 20—40 m.
011 = 40—80 m.
100 = 80—100 m.
101 = 100—140 m.
110 = 140—180 m.
111 = >180 m.
000
1 = Enabled.
0
Interrupt Mask
The bits in register 25 control the device interrupt mask. The following table lists the
settings available.
Table 29.
Revision 4.3
August 2009
Interrupt Mask, Address 25 (0x19)
Bit
Name
15
MDINT interrupt status enable
Access
R/W
Description
This is a sticky bit.
1 = Enabled.
Default
0
14
Speed state change mask
R/W
This is a sticky bit.
1 = Enabled.
0
13
Link state change mask
R/W
This is a sticky bit.
1 = Enabled.
0
12
FDX state change mask
R/W
This is a sticky bit.
1 = Enabled.
0
11
Auto-negotiation error mask
R/W
1 = Enabled.
0
10
Auto-negotiation complete mask
R/W
This is a sticky bit.
1 = Enabled.
0
9
Inline powered device detect mask
R/W
This is a sticky bit.
1 = Enabled.
0
8:3
Reserved
RO
Page 54
VSC8641 Datasheet
Configuration
Table 29.
Interrupt Mask, Address 25 (0x19) (continued)
Bit
Name
Access
Description
Default
2
Link speed downshift detect mask
R/W
This is a sticky bit.
1 = Enabled.
0
1
Master/Slave resolution error mask
R/W
This is a sticky bit.
1 = Enabled.
0
0
Reserved
RO
Note When bit 25.15 is set, the MDINT pin is enabled. When enabled, the state of this
pin reflects the state of bit 26.15. Clearing this bit only inhibits the MDINT pin from
being asserted.
4.2.23
Interrupt Status
The status of interrupts already written to the device are available for reading from
register 26 in the main registers space. The following table lists the readouts you can
expect.
Table 30.
Interrupt Status, Address 26 (0x1A)
Bit
Name
15
Interrupt status
Access
RO
Description
This is a self-clearing bit.
1 = Interrupt pending.
Default
0
14
Speed state change status
RO
This is a self-clearing bit.
1 = Interrupt pending.
0
13
Link state change status
RO
This is a self-clearing bit.
1 = Interrupt pending.
0
12
FDX state change status
RO
This is a self-clearing bit.
1 = Interrupt pending.
0
11
Auto-negotiation error status
RO
This is a self-clearing bit.
1 = Interrupt pending.
10
Auto-negotiation complete status
RO
This is a self-clearing bit.
1 = Interrupt pending.
0
9
Inline powered device detect status
RO
This is a self-clearing bit.
1 = Interrupt pending.
0
8:3
Reserved
RO
2
Link speed downshift detect status
RO
This is a self-clearing bit.
1 = Interrupt pending.
0
1
Master/Slave resolution error status
RO
This is a self-clearing bit.
1 = Interrupt pending.
0
0
Reserved
RO
The following information applies to the interrupt status bits:
Revision 4.3
August 2009
•
All set bits in this register are cleared after being read (self-clearing). If bit 26.15 is
set, the cause of the interrupt can be read by reading bits 26.14:0.
•
For bits 26.14 and 26.12, bit 0.12 must be set for this interrupt to assert.
•
For bit 26.2, bits 4.8:5 must be set for this interrupt to assert.
Page 55
VSC8641 Datasheet
Configuration
4.2.24
LED Control
If you are using the simple LED method of control, you can control the LEDs using the
following settings. If you are using the enhanced LED method, there are different
register settings you can use. For information about the enhanced LED register
settings, see “Enhanced LED Method Select,” page 59.
Table 31.
Revision 4.3
August 2009
LED Control, Address 27 (0x1B)
Bit
Name
Access
Description
Default
15
Link 10 LED force on (LED3 pin)
R/W
This is a sticky bit.
1 = Forced on.
0 = Default.
0
14
Link 10 LED disable (LED3 pin)
R/W
This is a sticky bit.
1 = Disabled.
0 = Default.
0
13
Link 100 LED force on (LED2 pin)
R/W
This is a sticky bit.
1 = Forced on.
0 = Default.
0
12
Link 100 LED disable (LED2 pin)
R/W
This is a sticky bit.
1 = Disabled.
0 = Default.
0
11
Link 1000 LED force on (LED1 pin)
R/W
This is a sticky bit.
1 = Forced on.
0 = Default.
0
10
Link 1000 LED disable (LED1 pin)
R/W
This is a sticky bit.
1 = Disabled.
0 = Default.
0
9:8
Reserved
7
Activity LED force on (LED0 pin)
R/W
RO
This is a sticky bit.
1 = Forced on.
0 = Default.
0
6
Activity LED disable (LED0 pin)
R/W
This is a sticky bit.
1 = Disabled.
0 = Default.
0
5:4
Reserved
RO
3
LED pulse enable
RW
This is a sticky bit.
0 = Normal operation.
1 = LEDs pulse with a
5 KHz, 20% duty cycle
when active.
0
2
Activity LED blink enable
RW
This is a sticky bit.
1 = Enable.
0
1
Activity LED blink rate
RW
This is a sticky bit.
1 = 10 Hz blink rate.
0 = 5 Hz blink rate.
0
0
Reserved
RO
Page 56
VSC8641 Datasheet
Configuration
4.2.25
Auxiliary Control and Status
The following table lists the settings available.
Table 32.
Auxiliary Control and Status, Address 28 (0x1C)
Bit
Name
Access
Description
Default
15
Auto-negotiation complete
RO
Duplicate of bit 1.5.
0
14
Auto-negotiation disabled
RO
Inverted duplicate of bit 0.12.
0
13
MDI/MDI-X crossover
indication
RO
1 = MDI/MDI-X crossover
performed internally.
0
12
CD pair swap
RO
1 = CD pairs are swapped.
0
11
A polarity inversion
RO
1 = Polarity swap on pair A.
0
10
B polarity inversion
RO
1 = Polarity swap on pair B.
0
9
C polarity inversion
RO
1 = Polarity swap on pair C.
0
8
D polarity inversion
RO
1 = Polarity swap on pair D.
0
7:6
Reserved
RO
5
FDX status
RO
1 = Full duplex.
0 = Half duplex.
0
4:3
Speed status
RO
00
01
10
11
2
Reserved
1
Sticky Reset Enable
=
=
=
=
Speed is 10BASE-T.
Speed is 100BASE-TX.
Speed is 1000BASE-T.
Reserved.
00
RO
R/W
This is a super-sticky bit.
1 = Enabled. When enabled, all MII
register bits listed as sticky retain
their values during a software
reset.
1
0 = Disabled. When disabled, all
MII register bits listed as sticky
change to their default values
during a software reset.
Note that bits listed as super sticky
retain their values during a
software reset regardless of this
setting.
0
4.2.26
Reserved
RO
Delay Skew Status
The following table lists the settings available.
Table 33.
Delay Skew Status, Address = 29 (0x1D)
Bit
Revision 4.3
August 2009
Name
Access
15
Reserved
RO
14:12
Pair A delay skew
RO
11
Reserved
RO
Description
Skew in integral symbol times
Default
000
Page 57
VSC8641 Datasheet
Configuration
Table 33.
Delay Skew Status, Address = 29 (0x1D) (continued)
Bit
4.2.27
Name
Access
10:8
Pair B delay skew
RO
7
Reserved
RO
6:4
Pair C delay skew
RO
3
Reserved
RO
2:0
Pair D delay skew
RO
Description
Default
Skew in integral symbol times
000
Skew in integral symbol times
000
Skew in integral symbol times
000
Reserved Address Space
The bits in register 30 (0x1E) are reserved.
4.3
Extended Page Registers
To provide functionality beyond the IEEE802.3-specified 32 registers and main device
registers, the VSC8641 device includes an extended set of registers that provide an
additional 15 register spaces.
To access the extended page registers (16E through 30E), enable extended register
access by writing 0x0001 to register 31. For more information, see Table 35, page 59.
When extended page register access is enabled, reads and writes to registers 16
through 30 affect the extended registers 16E through 30E instead of those same
registers in the IEEE-specified register space. Registers 0 through 15 are not affected
by the state of the extended page register access.
Writing 0x0000 to register 31 restores the normal register access.
The following table lists the addresses and register names in the extended register
page space. These registers are accessible only when the device register 31 is set to
0x0001.
Table 34.
Extended Registers Page Space
Register Address
Revision 4.3
August 2009
Register Name
16E
Enhanced LED method select
17E
Enhanced LED behavior
18E
CRC good counter
19E
MAC resistor calibration control
20E
Extended PHY control 3
21E
EEPROM interface status and control
22E
EEPROM data read or write
23E
Extended PHY control 4
24E
Reserved
25E
Reserved
26E
Reserved
27E
Extended PHY control 5
Page 58
VSC8641 Datasheet
Configuration
Table 34.
Extended Registers Page Space (continued)
Register Address
4.3.1
Register Name
28E
RGMII skew control
29E
Ethernet packet generator (EPG) 1
30E
Ethernet packet generator (EPG) 2
Extended Page Access
The register at address 31 controls the access to the extended page registers for the
VSC8641 device. The following table lists the settings available.
Table 35.
Extended Page Access, Address 31 (0x1F)
Bit
Name
15:0
Extended page
register access
Access
R/W
Description
Default
0x0000 = MII register 16 through 30
accesses main register space
0x0000
0x0001 = MII register 16 through 30
accesses extended register space
4.3.2
Enhanced LED Method Select
If you are using the enhanced LED method of control, you can control the LEDs using
the following settings. If you are using the simple LED method, there are different
register settings you can use. For information about the simple LED register settings,
see “LED Control,” page 56.
Table 36.
Enhanced LED Method Select, Address 16E (0x10)
Bit
Name
15:12
LED3 mode select
11:8
Access
Description
Default
R/W
This is a sticky bit.
Select from LED modes 0-15 listed below.
CMODE
LED2 mode select
R/W
This is a sticky bit.
Select from LED modes 0-15 listed below.
0010
7:4
LED1 mode select
R/W
This is a sticky bit.
Select from LED modes 0-15 listed below.
0001
3:0
LED0 mode select
R/W
This is a sticky bit.
Select from LED modes 0-15 listed below.
1010
The following table shows the LED functional modes that can be programmed into any
of the device’s LED outputs. For more information about accessing or reading the status
of the outputs, see Table 36, page 59.
Table 37.
Revision 4.3
August 2009
Available LED Mode Settings
Mode
Bit Setting
0
0000
LED Indicates
Link/Activity
1
0001
Link1000/Activity
2
0010
Link100/Activity
Page 59
VSC8641 Datasheet
Configuration
Table 37.
4.3.3
Available LED Mode Settings (continued)
Mode
Bit Setting
LED Indicates
3
0011
Link10/Activity
4
0100
Link100/1000/Activity
5
0101
Link10/1000/Activity
6
0110
Link10/100/Activity
7
0111
Reserved
8
1000
Duplex/Collision
9
1001
Collision
10
1010
Activity
11
Reserved
12
1100
Autoneg_Fault
13
Reserved
14
1110
Force LED off
15
1111
Force LED on
Enhanced LED Behavior
The following table lists the settings available.
Table 38.
Revision 4.3
August 2009
Enhanced LED Behavior, Address 17E (0x11)
Bit
Name
15:13
Reserved
Access
Description
Default
12
LED pulsing enable
R/W
This is a sticky bit.
0 = Normal operation.
1 = LEDs pulse with a 5 KHz, 20% duty cycle
when active.
0
11:10
LED blink / pulsestretch rate
R/W
This is a sticky bit.
00 = 2.5 Hz blink rate / 400 ms pulsestretch.
01 = 5 Hz blink rate / 200 ms pulse-stretch.
10 = 10 Hz blink rate / 100 ms pulse-stretch.
11 = 20 Hz blink rate / 50 ms pulse-stretch.
01
9
Reserved
8
LED3 pulse-stretch /
blink select
R/W
This is a sticky bit.
1 = Pulse-stretch.
0 = Blink.
1
7
LED2 pulse-stretch /
blink select
R/W
This is a sticky bit.
1 = Pulse-stretch.
0 = Blink.
1
6
LED1 pulse-stretch /
blink select
R/W
This is a sticky bit.
1 = Pulse-stretch.
0 = Blink.
1
5
LED0 pulse-stretch /
blink select
R/W
This is a sticky bit.
1 = Pulse-stretch.
0 = Blink.
1
RO
RO
Page 60
VSC8641 Datasheet
Configuration
Table 38.
Enhanced LED Behavior, Address 17E (0x11) (continued)
Bit
Name
4
LED mode
Access
R/W
Description
Default
0
This is a sticky bit.
1 = Enhanced LED method (controlled by MII
register 16E and 17E).
0 = Simple LED method (controlled by MII
register 27).
3
LED3 combine
feature disable
R/W
This is a sticky bit.
0 = Combine enabled (Link/Activity, Duplex/
Collision).
CMODE
1 = Disable Combination (Link only, Duplex
only).
2
LED2 combine
feature disable
R/W
This is a sticky bit.
0 = Combine enabled (Link/Activity, Duplex/
Collision).
CMODE
1 = Disable Combination (Link only, Duplex
only).
1
LED1 combine
feature disable
R/W
This is a sticky bit.
0 = Combine enabled (Link/Activity, Duplex/
Collision).
CMODE
1 = Disable Combination (Link only, Duplex
only).
0
LED0 combine
feature disable
R/W
This is a sticky bit.
0 = Combine enabled (Link/Activity, Duplex/
Collision).
CMODE
1 = Disable Combination (Link only, Duplex
only).
Note Bit 4 must be set to 1 before register 16E and 17E are enabled for enhanced
LED control. If set to 0, then the LED features in 16E and 17E are not relevant. If set to
1, then the LED features in register 27 are not relevant.
4.3.4
CRC Good Counter
Register 31E makes it possible to read the contents of the CRC good counter; the
number of CRC routines that have executed successfully. The following table lists the
possible readouts.
Table 39.
Revision 4.3
August 2009
CRC Good Counter, Address 18E (0x12)
Bit
Name
15
Packet since last
read
Access
RO
14
Reserved
RO
13:0
CRC good counter
contents
RO
Description
This is a self-clearing bit.
1 = Packet received since last read.
This is a self-clearing bit.
Counter containing the number of packets
with valid CRCs. This counter does not stop
counting and will roll over.
Default
0
0x000
Page 61
VSC8641 Datasheet
Configuration
4.3.5
MAC Resistor Calibration Control
The following table lists the settings available.
Table 40.
MAC Resistor Calibration Control, Address 19E (0x13)
Bit
Name
15:14
MAC resistor
calibration control
setting
13:0
4.3.6
Reserved
Access
R/W
Description
Default
This is a sticky bit.
00 = 50 Ω.
01 = 60 Ω.
10 = 30 Ω.
11 = 45 Ω.
CMODE
RO
Extended PHY Control 3
Register 20E controls the ActiPHY sleep timer, its wake-up timer, the frequency of the
CLKOUT signal, and its link speed downshifting feature. The following table lists the
settings available.
Table 41.
Extended PHY Control 3, Address 20E (0x14)
Bit
Name
15
Reserved
14:13
ActiPHY sleep timer
Access
Description
Default
RO
R/W
This is a sticky bit.
00 = 1 second.
01 = 2 seconds.
10 = 3 seconds.
11 = 4 seconds.
01
00
01
10
11
01
12:11
Reserved
10:9
ActiPHY link status
time-out control
RO
8:6
Reserved
5
MAC RX_CLK
Disable
R/W
1 = RX_CLK is held low.
0 = RX_CLK is in normal operation.
4
Enable link speed
auto-downshift
feature
R/W
This is a sticky bit.
1 = Enable auto link speed downshift from
1000BASE-T.
3:2
Link speed
auto-downshift
control
R/W
This is a sticky bit.
00 = Downshift after two failed 1000BASE-T
auto-negotiation attempts.
R/W
=
=
=
=
1
2
3
4
second.
second.
second.
second.
RO
0
CMODE
01
01 = Downshift after three failed 1000BASE-T
auto-negotiation attempts.
10 = Downshift after four failed 1000BASE-T
auto-negotiation attempts.
11 = Downshift after five failed 1000BASE-T
auto-negotiation attempts.
Revision 4.3
August 2009
Page 62
VSC8641 Datasheet
Configuration
Table 41.
4.3.7
Extended PHY Control 3, Address 20E (0x14) (continued)
Bit
Name
Access
1
Link speed
auto-downshift
status
RO
0
Reserved
RO
Description
Default
0 = No downshift.
1 = Downshift is required or has occurred.
0
EEPROM Interface Status and Control
Register 21E is used to affect control over device function when you have incorporated
a startup EEPROM into your design.
Table 42.
4.3.8
EEPROM Interface Status and Control, Address 21E (0x15)
Bit
Name
Access
Description
Default
15
Reserved
14
Re-read EEPROM
after software reset
R/W
This is a super-sticky bit.
1 = Contents of EEPROM to be re-read
after software reset.
0
13
Enable EEPROM
access
R/W
This is a self-clearing bit.
1 = Execute read or write EEPROM
based on the settings of register 21E,
bit 12.
0
12
EEPROM read or
write
R/W
1 = Read from EEPROM.
0 = Write to EEPROM.
1
11
EEPROM ready
1 = EEPROM is ready for read or
write.
1
10:0
EEPROM address
RO
RO
R/W
Sets the address of the EEPROM to
which the read or write is to be
directed.
00000000000
EEPROM Data Read/Write
Register 22E in the extended register space enables access to the contents of the
external EEPROM in your design. The following table lists the writes needed to obtain
the data from the external device.
Table 43.
Revision 4.3
August 2009
EEPROM Read or Write, Address 22E (0x16)
Bit
Name
15:8
EEPROM read data
Access
RO
7:0
EEPROM write data
R/W
Description
Default
Eight-bit data read from EEPROM;
requires setting register 21E, bit 13.
0x00
Eight-bit data to be written to EEPROM.
0x00
Page 63
VSC8641 Datasheet
Configuration
4.3.9
Extended PHY Control 4
The register at address 23E consists of the fourth set bits that control various aspects
of inline powering and the CRC error counter in the VSC8641 device.
Table 44.
Extended PHY Control 4, Address 23E (0x17)
Bit
Name
15:11
PHY address
10
Inline powered
device detection
R/W
9:8
Inline powered
device detection
status
RO
00 = Searching for devices.
01 = Device found; requires inline power.
10 = Device found; does not require
inline power.
11 = Reserved.
00
7:0
CRC error counter
RO
This is a self-clearing bit.
CRC error counter for the Ethernet packet
generator. The value saturates at 0xFF
and subsequently clears when read and
restarts count.
0x00
Note
4.3.10
Access
RO
Description
Default
PHY address; latched on reset.
CMODE
This is a sticky bit.
1 = Enabled.
0
Bits 9:8 are only valid if bit 10 is set.
Reserved Extended Registers
The bits in the extended register page space at addresses 24E, 25E, and 26E (0x18,
0x19, and 0x1A, respectively) are reserved.
4.3.11
Extended PHY Control 5
The following table lists the settings available.
Table 45.
Revision 4.3
August 2009
Extended PHY Control 5, Address 27E (0x1B)
Bit
Name
15
HP Auto-MDIX in
forced 10/100
14
Reserved
Access
R/W
Description
This is a sticky bit.
1 = Disabled.
For more information about HP Auto-MDIX,
see “Automatic Crossover and Polarity
Detection,” page 24.
Default
1
RO
Page 64
VSC8641 Datasheet
Configuration
Table 45.
Extended PHY Control 5, Address 27E (0x1B) (continued)
Bit
Name
13:12
CRS behavior
control
Access
R/W
Description
This is a sticky bit.
Controls the CRS Behavior. The effect of
each setting depends on whether it is halfduplex or full-duplex operation.
Default
00
For half-duplex operation:
00: CRS = RX_DV + TX_EN
01: CRS = RX_DV + TX_EN
10: CRS = RX_DV
11: CRS = RX_DV.
For full-duplex operation:
00: CRS = RX_DV
01: CRS = 0
10: CRS = RX_DV
11: CRS = 0.
Revision 4.3
August 2009
11
EEPROM present
RO
1 = Configuration EEPROM detected on the
EECLK and EEDAT pins.
0
10
Far End loopback
mode
R/W
1 = Enabled.
0
9
PICMG 2.16 reduced
power mode
R/W
This is a sticky bit.
1 = Enabled.
0
8:6
100BASE-TX
transmitter
amplitude control
R/W
This is a sticky bit.
011 = Reserved.
010 = +4 amplitude setting (largest).
001 = +3 amplitude setting.
000 = +2 amplitude setting.
111 = +1 amplitude setting.
110 = Default amplitude.
101 = –1 amplitude setting.
100 = –2 amplitude setting (smallest).
110
5:3
1000BASE-T
transmitter
amplitude control
R/W
This is a sticky bit.
011 = Reserved.
010 = +2 amplitude setting (largest).
001 = +1 amplitude setting.
000 = Default amplitude.
111 = –1 amplitude setting.
110 = –2 amplitude setting.
101 = –3 amplitude setting.
100 = –4 amplitude setting (smallest)
000
2:0
1000BASE-T edge
rate control
R/W
This is a sticky bit.
011 = +4 edge rate (slowest).
010 = +3 edge rate.
001 = +2 edge rate.
000 = +1 edge rate.
111 = default edge rate.
110 = –1 edge rate.
101 = –2 edge rate.
100 = –3 edge rate (fastest)
111
Page 65
VSC8641 Datasheet
Configuration
4.3.12
RGMII Skew Control
The following table lists the settings available.
Table 46.
4.3.13
RGMII Skew Control, Address 28E (0x1C)
Bit
Name
15:14
RGMII TX skew
compensation
enable
13:12
Access
Description
Default
R/W
This is a sticky bit.
00 = 0 ns.
01 = 1.4 ns.
10 = 1.7 ns.
11 = 2.0 ns.
Note There is a design consideration
associated with this register. For more
information, see “Setting the Internal
RGMII Timing Compensation Value,”
page 121.
CMODE
RGMII RX skew
compensation
enable
R/W
This is a sticky bit.
00 = 0 ns.
01 = 1.4 ns.
10 = 1.7 ns.
11 = 2.0 ns.
Note There is a design consideration
associated with this register. For more
information, see “Setting the Internal
RGMII Timing Compensation Value,”
page 121.
CMODE
11:10
Jumbo packet mode
R/W
This is a sticky bit.
00 = Normal IEEE 1.5 kB packet length.
01 = Normal IEEE 9 kB packet length.
10 = Normal IEEE 12 kB packet length.
11 = Normal IEEE 16 kB packet length.
9
10BASE-T no
preamble mode
R/W
This is a sticky bit.
1 = Enabled, no preamble required.
0 = Disabled, preamble required.
8:0
Reserved
00
0
RO
Ethernet Packet Generator (EPG) Control 1
The EPG control register provides access to and control of various aspects of the EPG
testing feature. There are two, separate EPG control registers. The following table lists
the setting available in the first register.
Table 47.
Revision 4.3
August 2009
EPG Control Register 1, Address 29E (0x1D)
Bit
Name
15
EPG enable
Access
14
EPG run or stop
R/W
1 = Run EPG
0
13
Transmission
duration
R/W
1 = Continuous (sends in 10,000-packet
increments)
0 = Send 30,000,000 packets and stop
0
R/W
Description
1 = Enable EPG
Default
0
Page 66
VSC8641 Datasheet
Configuration
Table 47.
EPG Control Register 1, Address 29E (0x1D) (continued)
Bit
Name
Access
Description
12:11
Packet length
R/W
00
01
10
11
10
Inter-packet gap
R/W
1 = 8,192 ns
0 = 96 ns
9:6
Destination address
R/W
Lowest nibble of the six-byte destination
address
0001
5:2
Source address
R/W
Lowest nibble of the six-byte destination
address
0000
1
Payload type
R/W
1 = Randomly generated payload pattern
0 = Fixed based on payload pattern
0
0
Bad frame check
sequence (FCS)
generation
R/W
1 = Generate packets with bad FCS
0 = Generate packets with good FCS
0
=
=
=
=
Default
0
125 bytes
64 bytes
1518 bytes
10,000 bytes (Jumbo packet)
0
The following information applies to the EPG control number 1:
4.3.14
•
Do not run the EPG when the VSC8641 device is connected to a live network.
•
Bit 29E.13 (Continuous EPG mode control): When enabled, this mode causes the
device to send continuous packets. When disabled, the device continues to send
packets only until it reaches the next 10,000-packet increment mark. It then
ceases to send packets.
•
The six-byte destination address in bits 9:6 is assigned one of 16 addresses in the
range of 0xFF FF FF FF FF F0 through 0xFF FF FF FF FF FF.
•
The six-byte source address in bits 5:2 is assigned one of 16 addresses in the range
of 0xFF FF FF FF FF F0 through 0xFF FF FF FF FF FF.
•
If any of bits 13:0 are changed while the EPG is running (bit 14 is set to 1), bit 14
must be cleared and then set back to 1 for the change to take effect and to restart
the EPG.
Ethernet Packet Generator Control 2
The register at address 30E consists of the second of bits that provide access to and
control over various aspects of the EPG testing feature. For information about the first
set of EPG control bits, see Table 47, page 66. The following table lists the settings
available.
Table 48.
EPG Control Register 2, Address 30E (0x1E)
Bit
Name
15:0
EPG packet payload
Access
R/W
Description
Data pattern repeated in the payload of
packets generated by the EPG
Default
0x00
Note If any of bits 15:0 in this register are changed while the EPG is running (bit 14
of register 29E is set to 1), that bit (29E.14) must first be cleared and then set back to
1 for the change to take effect and to restart the EPG.
Revision 4.3
August 2009
Page 67
VSC8641 Datasheet
Configuration
4.4
CMODE
The information in this section consists of a detailed description of the methods to
configure the VSC8641 device using its CMODE pins. It includes descriptions of the
registers that work together with the CMODE pins to control the device function.
There are five configuration mode (CMODE) pins on the VSC8641 device. For more
information about the physical location of the CMODE pins, see “Pin Diagram
(VSC8641XKO, VSC8641XKO-03),” page 104. Each CMODE pin maps to a configuration
bit, which means there are 20 possible settings for the device.
4.4.1
CMODE Pins and Related Functions
The following table lists the pin numbers and device functionality that is controlled by
each configuration bit.
Table 49.
CMODE Configuration Pins and Device Functions
CMODE Pin Bit 3 (MSB) Control
Bit 2 Controls
Bit 1 Controls
Bit 0 (LSB) Controls
4
MAC mode
LED3[1]
LED3[0]
LED combine/separate
3
PHY address[3]
PHY address[4]
MAC calibration
setting[1]
MAC calibration
setting[0]
2
PHY address[2]
ActiPHY
RGMII clock skew[1]
RGMII clock skew[0]
1
PHY address[1]
Link speed downshift
Speed/duplex modes[1]
Speed/duplex modes[0]
0
PHY address[0]
CLKOUT enable
Advertise asymmetric
pause
Advertise symmetric
pause
4.4.2
Functions and Related CMODE Pins
The following table lists the pin and bit settings according to the device function and
CMODE pin used to configure it.
Table 50.
Device Functions and Associated CMODE Pins
Function
PHY Address[4:0]
CMODE
Pin
Bit
Associated
Register, Bit
Result
3 to 0
3 and 2
MAC mode
4
3
Register 23,
bit 12
Link speed
downshift
1
2
Register 20E,
bit 4
Speed and duplex
1
1 and 0
Register 4,
bits 8:5 and
Register 9,
bits 9:8
00
01
10
11
=
=
=
=
10/100/1000BASE-T FDX/HDX.
10/100/1000BASE-T FDX; 10/100BASE-T HDX.
1000BASE-T FDX only.
10/100BASE-T FDX/HDX.
RGMII clock skew
2
1 and 0
Register 23,
bit 8 and
Register 28E,
bits 15:12
00
01
10
11
=
=
=
=
No skew on RX_CLK and TX_CLK.
1.4 ns skew on RX_CLK and TX_CLK.
1.7 ns skew on RX_CLK and TX_CLK.
2.0 ns skew on RX_CLK and TX_CLK.
Revision 4.3
August 2009
Sets the PHY address.
0 = RGMII.
1 = GMII.
0 = Link only according to the auto-negotiation
resolution.
1 = Enable link speed downshift feature.
Page 68
VSC8641 Datasheet
Configuration
Table 50.
Device Functions and Associated CMODE Pins (continued)
CMODE
Pin
Bit
Advertise
asymmetric pause
0
1
Register 4,
bit 11
0 = Not advertised.
1 = Advertised.
Advertise
symmetric pause
0
0
Register 4,
bit 10
0 = Not advertised.
1 = Advertised.
CLKOUT enable
0
2
Register 18,
bit 0
0 = Disabled.
1 = Enabled.
ActiPHY
2
2
Register 23,
bit 5
0 = Disabled.
1 = Enabled.
LED combine/
separate
4
0
Register 17E,
bits 3:0
Function
Associated
Register, Bit
Result
1 = Link, Link10, Link100, Link1000, Link10/100,
Link10/1000, and Link100/1000 LEDs blink or flash
when activity is present. Also, Duplex LED blinks or
flashes when collision is present.
0 = Link, Link10, Link100, Link1000, Link10/100,
Link10/1000, and Link100/1000 LEDs indicate status
only. Also, Duplex indicates duplex status only.
MAC resistor
calibration setting
3
1 and 0
Register 19E,
bits 15:14
00
01
10
11
LED3 control
4
2 and 1
Register 16E,
bits 15:12
00 = Link10/Activity.
01 = Duplex/Collision.
4.4.3
=
=
=
=
50
60
30
45
Ω.
Ω.
Ω.
Ω.
CMODE Resistor Values
To affect the VSC8641 device configuration, find the parameter in Table 49, page 68 or
in Table 50, page 68, and connect the associated pin to the resistor specified in the
following table. This sets the bits as shown.
Table 51.
CMODE Resistor Values and Resultant Bit Settings
With CMODE
Pin Tied To
Revision 4.3
August 2009
With 1%
Resistor
Value
Set
Bit 3 (MSB) to:
Set
Bit 2 to:
Set
Bit 1 to:
Set
Bit 0 (LSB) to:
VSS
0
0
0
0
0
VSS
2.26 kΩ
0
0
0
1
VSS
4.02 kΩ
0
0
1
0
VSS
5.90 kΩ
0
0
1
1
VSS
8.25 kΩ
0
1
0
0
VSS
12.1 kΩ
0
1
0
1
VSS
16.9 kΩ
0
1
1
0
VSS
22.6 kΩ
0
1
1
1
VDD33
0
1
0
0
0
VDD33
2.26 kΩ
1
0
0
1
VDD33
4.02 kΩ
1
0
1
0
VDD33
5.90 kΩ
1
0
1
1
Page 69
VSC8641 Datasheet
Configuration
Table 51.
CMODE Resistor Values and Resultant Bit Settings (continued)
With 1%
Resistor
Value
Set
Bit 3 (MSB) to:
Set
Bit 2 to:
Set
Bit 1 to:
Set
Bit 0 (LSB) to:
VDD33
8.25 kΩ
1
1
0
0
VDD33
12.1 kΩ
1
1
0
1
VDD33
16.9 kΩ
1
1
1
0
VDD33
22.6 kΩ
1
1
1
1
With CMODE
Pin Tied To
Using resistors with the CMODE pins can be optional in designs that access the device’s
MDC/MDIO pins. In designs that do this, all configurations otherwise affected on the
device by using the CMODE pins can be changed using the regular device register
settings, and all the CMODE pins can be pulled to VSS (ground). However, the
PHYADDR[4:0] still requires CMODE configuration.
4.5
EEPROM
The VSC8641 device EEPROM interface makes it possible to set up the device to selfconfigure its internal registers based on the information programmed into and stored in
an external device. To accomplish this, the EEPROM is read on power-up or de-assertion
of the NRESET bit. For field configuration, the EEPROM can also be accessed using
VSC8641 device registers 21E and 22E.
The EEPROM used to interface to the VSC8641 device must have a two-wire interface. A
device such as the Atmel part AT24CXXX is suggested.
As defined by the interface, data is clocked from the VSC8641 device on the falling
edge of EECLK. The device determines that an external EEPROM is present if EEDAT is
connected to a 4.7 kΩ external pull-up resistor. The EEDAT pin can be left floating or
grounded to indicate that no EEPROM is present.
4.5.1
EEPROM Contents Description
When an EEPROM is present, the VSC8641 device looks for the command header,
0xBDBD at address 0 and 1 of the EEPROM. The address is incremented by 256 until
the header is found. If the header is not found or no EEPROM is connected, the
VSC8641 device bypasses the EEPROM read step.
When an EEPROM is present, the VSC8641 device waits for an acknowledgement for
approximately three seconds (in accordance with the ATMEL EEPROM protocol). If there
is no acknowledgement for three seconds, the VSC8641 device aborts its attempt to
connect to the EEPROM and reverts to its otherwise normal operating mode.
After the header value is found, the two-byte address value shown in the following table
indicates the EEPROM word address where the base address location for the device is
located. At the base address location, the next set of bytes indicates where the
configuration data contents to be programmed into the VSC8641 device are located. At
the programming location, the first two bytes represent the total number of bytes (11
bits long, with MSB first) where the Total_Number_Bytes[10:0] is equal to the number
of SMI writes multiplied by 3 (one byte for SMI port and register address and two bytes
Revision 4.3
August 2009
Page 70
VSC8641 Datasheet
Configuration
for data). Data is read from the EEPROM sequentially until all SMI write commands are
completed.
Table 52.
EEPROM Configuration Contents
10-bit Address
Content (Bits 7:0)
0
0xBD
1
0xBD
2
PHY_ADDR[4:0], Base_Address_Location[10:8]
3
Base_Address_Location[7:0] (K)
Address length not specified
Address length not specified
K
00000, Config Location[10:8]
K+1
Config_Location[7:0] (X)
Address length not specified
Address length not specified
X
00000, Total_Number_Bytes[10:8]
X+1
Total_Number_Bytes[7:0] (M)
X+2
Register address a
X+3
Data[15:8] to be written to register address a
X+4
Data[7:0] to be written to register address a
X+5
Register address b
X+6
Data[15:8] to be written to register address b
X+7
Data[7:0] to be written to register address b
Address length not specified
X+(M–2)
Register address x
X+(M–1)
Data[15:8] to be written to register address x
X+M
Data[7:0] to be written to register address x
Address length not specified
Address length not specified
Max Address
4.5.2
Read/Write Access to the EEPROM
The VSC8641 device also has the ability to read from and write to an EEPROM such as
an ATMEL AT24CXXX that is directly connected to its EECLK and EEDAT pins. If it is
required to be able to write to the EEPROM, refer to the EEPROM’s specific datasheet to
ensure that write protection on the EEPROM is not set.
The following illustration shows the interaction of the VSC8641 device and the EEPROM.
Revision 4.3
August 2009
Page 71
VSC8641 Datasheet
Configuration
Figure 18.
EEPROM Read and Write Register Flow
START
21E.11 = 0
Wait for Ready
Read Data = 22E.15:8
21E.11 = 1
Write EEPROM
Data
21E.13 = 1
Read or Write
Read EEPROM
Data
21E.10:0 = Write Address
21E.12 = 0
22E.7:0 = Data to Write
21E.11 = 1
21E.10:0 = Address to Read
21E.12 = 1
Wait for Ready
21E.11 = 0
21E.13 = 1
To read a value from a specific address of the EEPROM:
1.
Read the VSC8641 device register bit 21E.11 and ensure that it is set.
2.
Write the EEPROM address to be read to register bits 21E.10:0.
3.
Set both register bits 21E.12 and 21E.13 both to 1.
4.
When register bit 21E.11 changes to 1, read the 8-bit data value found at register
bits 22E.15:8. This is the contents of the address just read by the PHY.
To write a value to a specific address of the EEPROM:
Revision 4.3
August 2009
1.
Read the VSC8641 device register bit 21E.11 and ensure that it is set.
2.
Write the address to be written to register bits 21E.10:0.
3.
Set register bit 21E.12 to 0.
4.
Set register bits 22E.7:0 with the 8-bit value to be written to the EEPROM.
5.
Set register bit 21E.13 to 1.
6.
To avoid collisions during read and write transactions, always wait until register bit
21E.11 changes to 1 before performing another EEPROM read or write operation.
Page 72
VSC8641 Datasheet
Electrical Specifications
5
Electrical Specifications
This section provides the DC characteristics, AC characteristics, recommended
operating conditions, and stress ratings for the VSC8641 device. It includes information
on the various timing functions of the device.
5.1
DC Characteristics
In addition to any parameter-specific conditions, the specifications listed in the
following table may be considered valid only in the environment characterized by the
specifications listed as recommended operating conditions for the VSC8641 device. For
more information about the recommended operating conditions, see “Operating
Conditions,” page 91.
5.1.1
VDDIO at 3.3 V
In addition to any parameter-specific conditions, the specifications listed in the
following table may be considered valid only when all of these apply:
Table 53.
•
VDDIO is 3.3 V
•
VDD33 is 3.3 V
•
VDD12 is 1.2 V
•
VDD12A is 1.2 V
•
VDDREG is 3.3 V
DC Characteristics for VDD33, VDDIOMAC, or VDDIOMICRO at 3.3 V
Parameter
Revision 4.3
August 2009
Symbol
Minimum
Maximum
Unit
Condition
Output high voltage
VOH
2.4
3.6
V
IOH = –4 mA
Output low voltage
VOL
0
0.5
V
IOL = 4 mA
Input high voltage
VIH
2.0
5.0
V
For JTAG pins
Input high voltage
VIH
1.7
3.6
V
For GMII mode
Input high voltage
VIH
2.1
3.6
V
For all other input pins
Input low voltage
VIL
–0.3
0.9
V
Input leakage
current
IILEAK
–43
43
µA
Internal resistor included
Output leakage
current
IOLEAK
–43
43
µA
Internal resistor included
11
mA
Output low current
drive strength
IOL
Output high current
drive strength
IOH
–20
mA
Page 73
VSC8641 Datasheet
Electrical Specifications
5.1.2
VDDIO at 2.5 V
In addition to any parameter-specific conditions, the specifications listed in the
following table may be considered valid only when all of these apply:
Table 54.
•
VDDIO is 2.5 V
•
VDD33 is 3.3 V
•
VDD12 is 1.2 V
•
VDD12A is 1.2 V
•
VDDREG is 3.3 V
DC Characteristics for VDDIOMAC or VDDIOMICRO at 2.5 V
Parameter
5.2
Symbol
Minimum
Maximum
Unit
Output high voltage
VOH
2.0
2.8
V
Output low voltage
VOL
–0.3
0.4
V
IOL = 1.0 mA
Input high voltage
VIH
1.7
3.0
V
For GMII input
Input high voltage
VIH
2.0
3.0
V
For all other pins
Input low voltage
VIL
–0.3
0.7
V
Input leakage current
IILEAK
–35
35
µA
Internal resistor included
Output leakage
current
IOLEAK
–35
35
µA
Internal resistor included
9
mA
Output low current
drive strength
IOL
Output high current
drive strength
IOH
–11
Condition
IOH = –1.0 mA
mA
Current Consumption
The current consumption values listed in this section are based on nominal values and
the PHY operating with full-duplex enabled and a 64-bit random data pattern at 100%
utilization. Values are grouped by the type of link and whether the on-chip switching
regulator is enabled.
5.2.1
Consumption with 1000BASE-T Link
The following table shows the current consumption values with a 1000BASE-T link and
the on-chip switching regulator enabled.
Table 55.
Current Consumption: 1000BASE-T, Regulator Enabled
Parameter
Current with VDD33 at 3.3 V
Current with VDDREG
Revision 4.3
August 2009
Symbol
Typical
Unit
IVDD33
115 (RGMII mode)
114 (GMII mode)
mA
IVDDREG
75 (RGMII mode)
76 (GMII mode)
mA
Page 74
VSC8641 Datasheet
Electrical Specifications
Table 55.
Current Consumption: 1000BASE-T, Regulator Enabled (continued)
Parameter
Symbol
Typical
Unit
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
32 (RGMII mode)
29 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
23 (RGMII mode)
21 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
734 (RGMII mode)
722 (GMII mode)
mW
Total power at 2.5 V
686 (RGMII mode)
679 (GMII mode)
mW
The following table shows the current consumption values with a 1000BASE-T link and
the on-chip switching regulator disabled.
Table 56.
Current Consumption: 1000BASE-T, Regulator Disabled
Parameter
Symbol
Typical
Unit
IVDD33
115 (RGMII mode)
114 (GMII mode)
mA
IVDDREG
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDD12 at 1.2 V
IVDD12
136 (RGMII mode)
135 (GMII mode)
mA
Current with VDD12A at 1.2 V
IVDD12A
34 (RGMII mode)
36 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
32 (RGMII mode)
29 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
23 (RGMII mode)
21 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
689 (RGMII mode)
677 (GMII mode)
mW
Total power at 2.5 V
641 (RGMII mode)
634 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
Revision 4.3
August 2009
Page 75
VSC8641 Datasheet
Electrical Specifications
5.2.2
Consumption with 100BASE-TX Link
The following table shows the current consumption values with a 100BASE-TX link and
the on-chip switching regulator enabled.
Table 57.
Current Consumption: 100BASE-TX, Regulator Enabled
Parameter
Symbol
Typical
Unit
IVDD33
94 (RGMII mode)
92 (GMII mode)
mA
IVDDREG
35 (RGMII mode)
35 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
5 (RGMII mode)
6 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
3 (RGMII mode)
4 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
442 (RGMII mode)
438 (GMII mode)
mW
Total power at 2.5 V
433 (RGMII mode)
428 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
The following table shows the current consumption values with a 100BASE-TX link and
the on-chip switching regulator disabled.
Table 58.
Current Consumption: 100BASE-TX, Regulator Disabled
Parameter
Symbol
Typical
Unit
IVDD33
94 (RGMII mode)
92 (GMII mode)
mA
IVDDREG
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDD12 at 1.2 V
IVDD12
55 (RGMII mode)
53 (GMII mode)
mA
Current with VDD12A at 1.2 V
IVDD12A
24 (RGMII mode)
25 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
5 (RGMII mode)
6 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
3 (RGMII mode)
4 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
422 (RGMII mode)
417 (GMII mode)
mW
Total power at 2.5 V
413 (RGMII mode)
407 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
Revision 4.3
August 2009
Page 76
VSC8641 Datasheet
Electrical Specifications
5.2.3
Consumption with 10BASE-T Link
The following table shows the current consumption values with a 10BASE-T link and the
on-chip switching regulator enabled.
Table 59.
Current Consumption: 10BASE-T, Regulator Enabled
Parameter
Symbol
Typical
Unit
IVDD33
155 (RGMII mode)
152 (GMII mode)
mA
IVDDREG
19 (RGMII mode)
19 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
573 (RGMII mode)
563 (GMII mode)
mW
Total power at 2.5 V
573 (RGMII mode)
563 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
The following table shows the current consumption values with a 10BASE-T link and the
on-chip switching regulator disabled.
Table 60.
Current Consumption: 10BASE-T, Regulator Disabled
Parameter
Symbol
Typical
Unit
IVDD33
155 (RGMII mode)
152 (GMII mode)
mA
IVDDREG
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDD12 at 1.2 V
IVDD12
24 (RGMII mode)
17 (GMII mode)
mA
Current with VDD12A at 1.2 V
IVDD12A
18 (RGMII mode)
25 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
562 (RGMII mode)
552 (GMII mode)
mW
Total power at 2.5 V
562 (RGMII mode)
552 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
Revision 4.3
August 2009
Page 77
VSC8641 Datasheet
Electrical Specifications
5.2.4
Consumption with No Link and ActiPHY Enabled
The following table shows the current consumption values with no link, ActiPHY
enabled, and the on-chip switching regulator enabled.
Table 61.
Current Consumption: No Link, ActiPHY Enabled, Regulator Enabled
Parameter
Symbol
Typical
Unit
IVDD33
21 (RGMII mode)
21 (GMII mode)
mA
IVDDREG
21 (RGMII mode)
21 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
12 (RGMII mode)
2 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
8 (RGMII mode)
1 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
178 (RGMII mode)
146 (GMII mode)
mW
Total power at 2.5 V
158 (RGMII mode)
142 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
The following table shows the current consumption values with no link, ActiPHY
enabled, and the on-chip switching regulator disabled.
Table 62.
Current Consumption: No Link, ActiPHY Enabled, Regulator Disabled
Parameter
Symbol
Typical
Unit
IVDD33
21 (RGMII mode)
21 (GMII mode)
mA
IVDDREG
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDD12 at 1.2 V
IVDD12
27 (RGMII mode)
27 (GMII mode)
mA
Current with VDD12A at 1.2 V
IVDD12A
20 (RGMII mode)
21 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
12 (RGMII mode)
2 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
8 (RGMII mode)
1 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
165 (RGMII mode)
134 (GMII mode)
mW
Total power at 2.5 V
146 (RGMII mode)
129 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
Revision 4.3
August 2009
Page 78
VSC8641 Datasheet
Electrical Specifications
5.2.5
Consumption with No Link and ActiPHY Disabled
The following table shows the current consumption values with no link, ActiPHY
disabled, and the on-chip switching regulator enabled.
Table 63.
Current Consumption: No Link, ActiPHY Disabled, Regulator Enabled
Parameter
Symbol
Typical
Unit
IVDD33
107 (RGMII mode)
104 (GMII mode)
mA
IVDDREG
22 (RGMII mode)
22 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
12 (RGMII mode)
2 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
8 (RGMII mode)
1 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
466 (RGMII mode)
423 (GMII mode)
mW
Total power at 2.5 V
446 (RGMII mode)
419 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
The following table shows the current consumption values with no link, ActiPHY
disabled, and the on-chip switching regulator disabled.
Table 64.
Current Consumption: No Link, ActiPHY Disabled, Regulator Disabled
Parameter
Symbol
Typical
Unit
IVDD33
107 (RGMII mode)
104 (GMII mode)
mA
IVDDREG
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDD12 at 1.2 V
IVDD12
27 (RGMII mode)
27 (GMII mode)
mA
Current with VDD12A at 1.2 V
IVDD12A
23 (RGMII mode)
23 (GMII mode)
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
12 (RGMII mode)
2 (GMII mode)
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
8 (RGMII mode)
1 (GMII mode)
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
< 1 (RGMII mode)
< 1 (GMII mode)
mA
Total power at 3.3 V
453 (RGMII mode)
410 (GMII mode)
mW
Total power at 2.5 V
433 (RGMII mode)
406 (GMII mode)
mW
Current with VDD33 at 3.3 V
Current with VDDREG
Revision 4.3
August 2009
Page 79
VSC8641 Datasheet
Electrical Specifications
5.2.6
Consumption in Power-Down Mode
The following table shows the current consumption values in power-down mode
(register address 0.11 = 1) with the regulator enabled.
Table 65.
Current Consumption: Power-Down, Regulator Enabled
Parameter
Current with VDD33 at 3.3 V
Current with VDDREG
Current with VDD12 at 1.2 V
Current with VDD12A at 1.2 V
Current with VDDIOMAC at 3.3 V
Current with VDDIOMAC at 2.5 V
Symbol
Typical
Unit
IVDD33
15
mA
IVDDREG
15
mA
IVDD12
0
mA
IVDD12A
0
mA
IVDDIOMAC
0
mA
IVDDIOMAC
0
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
0
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
Total power at 3.3 V
0
mA
99
mW
The following table shows the current consumption values in power-down mode
(register address 0.11 = 1) with the regulator disabled.
Table 66.
Current Consumption: Power-Down, Regulator Disabled
Parameter
Current with VDD33 at 3.3 V
Symbol
Typical
IVDD33
15
mA
IVDDREG
0
mA
Current with VDD12 at 1.2 V
IVDD12
12
mA
Current with VDD12A at 1.2 V
IVDD12A
20
mA
Current with VDDIOMAC at 3.3 V
IVDDIOMAC
0
mA
Current with VDDIOMAC at 2.5 V
IVDDIOMAC
0
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
0
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
0
mA
87.9
mW
Current with VDDREG
Total power at 3.3 V
5.2.7
Unit
Consumption in Reset State
The following table shows the current consumption values in the reset state
(NRESET pin pulled low).
Table 67.
Current Consumption: Reset State
Parameter
Current with VDD33 at 3.3 V
Typical
Unit
IVDD33
7
mA
IVDDREG
0
mA
Current with VDD12 at 1.2 V
IVDD12
0
mA
Current with VDD12A at 1.2 V
IVDD12A
0
mA
IVDDIOMAC
0
mA
Current with VDDREG
Current with VDDIOMAC at 3.3 V
Revision 4.3
August 2009
Symbol
Page 80
VSC8641 Datasheet
Electrical Specifications
Table 67.
Current Consumption: Reset State (continued)
Parameter
Current with VDDIOMAC at 2.5 V
Symbol
Typical
Unit
IVDDIOMAC
0
mA
Current with VDDIOMICRO at 3.3 V
IVDDIOMICRO
0
mA
Current with VDDIOMICRO at 2.5 V
IVDDIOMICRO
Total power at 3.3 V
5.3
0
mA
23.1
mW
AC Characteristics
The AC specifications are grouped according to specific device pins and associated
timing characteristics.
5.3.1
Reference Clock Input
The following table lists the specifications for the reference clock input frequency
including various frequencies, duty cycle, and accuracy.
Table 68.
AC Characteristics for REFCLK Input
Parameter
Symbol
Minimum
Typical
Maximum
Unit
Frequency with 25 MHz input
fCLK25
25
MHz
Frequency with 125 MHz input
fCLK125
125
MHz
Frequency accuracy
fTOL
Duty cycle
%DUTY
40
50
ppm
60
%
Rise time with 25 MHz input (20% to 80%)
tR25
4
ns
Rise time with 125 MHz input (20% to
80%)
tR125
1
ns
When using the 25 MHz crystal clock input option, the additional specifications in the
following table are required.
Table 69.
AC Characteristics for REFCLK Input with 25 MHz Clock Input
Parameter
Minimum
Crystal parallel load capacitance
Crystal equivalent series resistance
5.3.2
Typical
18
10
Maximum
Unit
20
pF
30
Ω
Clock Output
The specifications in the following table show the AC characteristics for the clock output
of the VSC8641 device.
Table 70.
AC Characteristics for the CLKOUT Pin
Parameter
CLKOUT frequency
Revision 4.3
August 2009
Symbol
fCLK
Minimum
Typical
125.00
Maximum
Unit
Condition
MHz
125 MHz output
clock
Page 81
VSC8641 Datasheet
Electrical Specifications
Table 70.
AC Characteristics for the CLKOUT Pin (continued)
Parameter
Symbol
CLKOUT cycle time
tCYC
Frequency stability
fSTABILITY
Duty cycle
Clock rise and fall
times (20% to 80%)
Typical
Maximum
Unit
8.0
44
%DUTY
ns
50
tR and tF
Total jitter
5.3.3
Minimum
JCLK
217
50
ppm
56
%
1
ns
600
ps
Condition
125 MHz output
clock
Measured peakto-peak, time
interval error
JTAG Interface
The following table lists the characteristics for the JTAG testing feature. For information
about the JTAG interface timing, see Figure 19, page 83.
Table 71.
AC Characteristics for the JTAG Interface
Parameter
Revision 4.3
August 2009
Symbol
Minimum
Maximum
Unit
10
MHz
TCK frequency
fCLK
TCK cycle time
tCYC
100
ns
TCK time high
tWH
45
ns
TCK time low
tWL
45
ns
Setup time to TCK rising
tSU
10
ns
Hold time from TCK rising
tH
10
TCK to TDO valid
tCO
ns
15
ns
Page 82
VSC8641 Datasheet
Electrical Specifications
Figure 19.
JTAG Interface Timing
tCYC
TCK
tWL
tWH
tSU
tH
TDI
TMS
TDO
tCO
5.3.4
SMI Interface
Use the information in the following table when incorporating the VSC8641 device SMI
interface into your own design. For information about the SMI interface timing, see
Figure 20, page 84.
Table 72.
AC Characteristics for the SMI Interface
Parameter
Symbol
MDC frequency(1)
fCLK
Minimum
Typical
Maximum
Unit
2.5
12.5
MHz
MDC cycle time
tCYC
80
400
ns
MDC time high
tWH
20
50
ns
MDC time low
tWL
20
50
ns
Setup to MDC rising
tSU
10
Hold from MDC rising
tH
10
MDC rise time
tR
100
tCYC × 10%(1)
MDC fall time
tF
100
tCYC × 10%(1)
MDC to MDIO valid
tCO
Condition
ns
ns
10
300
ns
For MDC = 0 – 1 MHz
For MDC = 1 MHz – fCLK(MAX)
ns
Time dependant on value of
external pull-up resistor on
MDIO pin
1. For fCLK above 1 MHz, the maximum rise time and fall time is in relation to the frequency of the MDC clock
period. For example, if fCLK is 2 MHz, the maximum clock rise time and fall time is 50 ns.
Revision 4.3
August 2009
Page 83
VSC8641 Datasheet
Electrical Specifications
Figure 20.
SMI Interface Timing
tWH
tWL
MDC
tCYC
tSU
tH
MDIO
(write)
Data
tCO
MDIO
(read)
5.3.5
Data
Device Reset
The following specifications apply to the device reset functionality. For information
about the reset timing, see Figure 21, page 85.
Table 73.
AC Characteristics for Device Reset
Parameter
Symbol
Minimum
NRESET assertion time
tRESET
100
ns
Wait time between NRESET
de-assert and access of the
SMI interface
tWAIT
20
220
ms
ms
tSRESET_ASSERT
4
ms
tSRESET_DEASSERT
4
ms
tRST_RISE
0
25
ms
ms
Soft reset (pin) assertion
Soft reset (pin) deassertion
Reset rise time
Supply stable time
Maximum
Unit
tVDDSTABLE
10
ms
Wait time between soft
reset pin de-assert and
access of the SMI interface
tSWAIT
4
300
200
200
µs
µs
ms
ms
Soft reset MII register 0.15
assertion
tSREG_RESET
100
ns
Wait time between Soft
Reset (MII Register 0.15)
de-assert and access to the
SMI interface
tSREG_WAIT
4
300
200
200
µs
µs
ms
ms
Revision 4.3
August 2009
Condition
Register 21E.14 = 0
Register 21E.14 = 1
If REG_EN pin = 0
If REG_EN pin = 1
Measured from a 10% level to a
90% level
Registers
Registers
Registers
Registers
28.1
28.1
28.1
28.1
=
=
=
=
1,
0,
0,
1,
21E.14
21E.14
21E.14
21E.14
=
=
=
=
0
0
1
1
Registers
Registers
Registers
Registers
18.1
18.1
18.1
18.1
=
=
=
=
1,
0,
0,
1,
21E.14
21E.14
21E.14
21E.14
=
=
=
=
0
0
1
1
Page 84
VSC8641 Datasheet
Electrical Specifications
Figure 21.
Reset Timing
tVDDSTABLE
VDD33
REFCLK
tRST_RISE
tWAIT
tRESET
NRESET
tSRESET_DEASSERT
tSRESET_ASSERT
NSRESET
tSREG_WAIT
tSWAIT
tSREG_RESET
Soft Reset
(MII Register 0.15)
Undefined State
MDC
MDIO
Note The NRESET and NSRESET are mutually exclusive.
5.3.6
GMII Transmit
The following table lists the characteristics when using the device in GMII transmit
mode. For information about the GMII transmit timing, see Figure 22, page 86.
Table 74.
AC Characteristics for GMII Transmit
Parameter
Minimum
Typical
Maximum
Unit
100
ppm
125
fCLK
Frequency offset
tolerance
fTOL
–100
Pulse width high
tHIGH
2.5
ns
Pulse width low
tLOW
2.5
ns
Setup to
GTX_CLK rising
tSU
2.0
ns
Hold from
GTX_CLK rising
tH
0
ns
tR and tF
Condition
MHz
Clock frequency
GTX_CLK rise
and fall times
Revision 4.3
August 2009
Symbol
1.0
ns
Measured from
0.7 V to 1.9 V
Page 85
VSC8641 Datasheet
Electrical Specifications
Figure 22.
GMII Transmit Timing
fCLK
1.9 V
0.7 V
GTX_CLK
tHIGH
tLOW
tF
tR
TXD[7:0]
TX_EN
TX_ER
1.9 V
0.7 V
tH
tSU
5.3.7
GMII Receive
The following table lists the characteristics when using the device in GMII receive mode.
For information about the GMII receive timing, see Figure 23, page 87.
Table 75.
AC Characteristics for GMII Transmit
Parameter
Minimum
Typical
Maximum
125
Unit
Frequency offset
tolerance
fTOL
–100
Pulse width high
tHIGH
2.5
ns
Pulse width low
tLOW
2.5
ns
Setup to RX_CLK
rising
tSU
2.5
ns
Hold from
RX_CLK rising
tH
0.5
ns
tR and tF
Condition
MHz
fCLK
RX_CLK rise and
fall times
Revision 4.3
August 2009
Symbol
Clock frequency
100
1.0
ppm
ns
Measured from
0.7 V to 1.9 V
Page 86
VSC8641 Datasheet
Electrical Specifications
Figure 23.
GMII Receive Timing
fCLK
1.9 V
0.7 V
RX_CLK
tHIGH
tLOW
tf
RXD[7:0]
RX_DV
RX_ER
tr
1.9 V
0.7 V
tH
tSU
5.3.8
MII Transmit
The following table lists the characteristics when using the device in MII transmit mode.
For information about the MII transmit timing, see Figure 24, page 87.
Table 76.
AC Characteristics for MII Transmit
Parameter
Figure 24.
Symbol
Minimum
Maximum
Unit
TX_CLK to TXD[3:0], TX_EN, TX_ER Delay
tDELAY
0
25
ns
TX_CLK Duty Cycle
tDUTY
35
65
%
MII Transmit Timing
TX_CLK
TTX_TCLK-Duty
TTX_TCLK-Delay
TXD[3:0]
TX_EN
TX_ER
Revision 4.3
August 2009
Valid Data
Page 87
VSC8641 Datasheet
Electrical Specifications
5.3.9
MII Receive
The following table lists the characteristics when using the device in MII receive mode.
For information about the MII receive timing, see Figure 25, page 88.
Table 77.
AC Characteristics for MII Receive
Parameter
Figure 25.
Symbol
Minimum
Unit
Setup to RX_CLK rising
tSU
10
ns
Hold from RX_CLK rising
tH
10
ns
MII Receive Timing
RX_CLK
tSU
RXD[3:0]
RX_DV
RX_ER
5.3.10
tH
Valid Data
RGMII Uncompensated
The following table lists the characteristics when using the device in RGMII
uncompensated mode. For information about the RGMII uncompensated timing, see
Figure 26, page 89.
Table 78.
AC Characteristics for RGMII Uncompensated
Parameter
Symbol
Minimum
Clock
frequency
Maximum
125
25
2.5
Unit
Condition
MHz
1000BASE-T operation
100BASE-TX operation
10BASE-T operation
1000BASE-T
duty cycle
tDUTY1000
45
50
55
%
At room temperature
and nominal supply
and register 28E.13:12
set to 10 or 11
1000BASE-T
duty cycle
tDUTY1000
40
50
60
%
Register 28E.13:12 set
to 00 or 01
tDUTY10/100
40
50
60
%
Data to clock
output skew
(at PHY)
tSKEWT
–500
0
500
ps
Data to clock
output skew
(at receiver)
tSKEWR
1.0
1.8
2.6
ns
10/100BASE-T
duty cycle
Revision 4.3
August 2009
Typical
Page 88
VSC8641 Datasheet
Electrical Specifications
Table 78.
Figure 26.
AC Characteristics for RGMII Uncompensated (continued)
Parameter
Symbol
TX_CLK
switching
threshold
VTHRESH
TX_CLK rise
and fall times
tR and tF
Minimum
Typical
Maximum
1.25
1.65
Unit
V
V
750
Condition
VDDIOMAC = 2.5 V
VDDIOMAC = 3.3 V
ps
RGMII Uncompensated Timing
TSKEWT
TX_CLK (at Transmitter)
TXD[3:0]
TXD[3:0]
TX_CTL
TXEN
TX_CLK (at Receiver)
TXD[7:4]
TXERR
TSKEWR
80%
20%
VTHRESH
TR, TF
TSKEWT
RX_CLK (at Transmitter)
RXD[3:0]
RXD[3:0]
RX_CTL
RXDV
RX_CLK (at Receiver)
Revision 4.3
August 2009
RXD[7:4]
RXERR
TSKEWR
TCYC
Page 89
VSC8641 Datasheet
Electrical Specifications
5.3.11
RGMII Compensated
The following table lists the characteristics when using the device in RGMII
compensated mode. For information about the RGMII compensated timing, see
Figure 27, page 91.
Table 79.
Revision 4.3
August 2009
AC Characteristics for RGMII Compensated
Parameter
Symbol
Minimum
Typical
Maximum
Unit
Data to clock output
setup (at PHY
integrated delay)
tSETUPT
1.2
2.0
3
ns
Data to clock output
setup (at receiver
integrated delay)
tSETUPR
1.0
2.0
3
ns
Data to clock output
hold (at transmitter
integrated delay)
tHOLDT
1.2
2.0
3
ns
Data to clock output
hold (at PHY
integrated delay)
tHOLDR
1.0
2.0
3
ns
TX_CLK switching
threshold
vTHRESH
1.25
1.65
V
V
Condition
VDDIOMAC = 2.5 V
VDDIOMAC = 3.3 V
Page 90
VSC8641 Datasheet
Electrical Specifications
Figure 27.
RGMII Compensated Timing
Delay = 2.0 ns
TX_CLK with
Internal
Delay Added
TX_CLK (at Transmitter)
TXD[3:0]
TXD[3:0]
TSETUPT
TXD[7:4]
THOLDT
TX_CTL
TX_CLK (at Receiver)
TXEN
TXERR
THOLDR
VTHRESH
TSETUPR
Delay = 2.0 ns
RX_CLK with
Internal
Delay Added
RX_CLK (at Transmitter)
RXD[3:0]
RXD[3:0]
RXD[7:4]
TSETUPT
THOLDT
RX_CTL
RXEN
RXERR
THOLDR
RX_CLK (at Receiver)
5.4
Operating Conditions
The following table lists the recommended operating conditions for the VSC8641
device.
Table 80.
Recommended Operating Conditions
Parameter
Symbol
Minimum
Typical
Maximum
Unit
Power supply voltage for VDDIOMICRO
at 2.5 V
VDDIOMICRO
2.37
2.5
2.63
V
Power supply voltage for VDDIOMICRO
at 3.3 V
VDDIOMICRO
3.0
3.3
3.6
V
Power supply voltage for VDDIOMAC at
2.5 V
VDDIOMAC
2.37
2.5
2.63
V
Power supply voltage for VDDIOMAC at
3.3 V
VDDIOMAC
3.0
3.3
3.6
V
VDD33
3.0
3.3
3.6
V
VDDREG
3.0
3.3
3.6
V
VDD12
1.14
1.2
1.26
V
Power supply voltage for VDD33
Power supply voltage for VDDREG
Power supply voltage for VDD12
Revision 4.3
August 2009
Page 91
VSC8641 Datasheet
Electrical Specifications
Table 80.
Recommended Operating Conditions (continued)
Parameter
Symbol
Minimum
Typical
Maximum
1.2
Power supply voltage for VDD12A
Unit
VDD12A
1.14
1.26
V
VSC8641 operating temperature(1)
T
0
90
°C
VSC8641-03 operating
temperature(1)
T
–40
90
°C
1. Lower limit of specification is ambient temperature, and upper limit is case temperature.
5.5
Stress Ratings
This section contains the stress ratings for the VSC8641 device.
Warning Stresses listed in the following table may be applied to devices one at a time
without causing permanent damage. Functionality at or exceeding the values listed is
not implied. Exposure to these values for extended periods may affect device reliability.
Table 81.
Stress Ratings
Parameter
DC input voltage on VDDIOMICRO supply pin
DC input voltage on VDDIOMAC supply pin
DC input voltage on VDD33 supply pin
DC input voltage on VDDREG supply pin
DC input voltage on VDD12 supply pin
DC input voltage on VDD12A supply pin
Symbol
Minimum
Maximum
Unit
VDDIOMICRO
–0.5
4.0
V
VDDIOMAC
–0.5
4.0
V
VDD33
–0.5
4.0
V
VDDREG
–0.5
4.0
V
VDD12
–0.5
1.5
V
VDD12A
–0.5
1.5
V
DC input voltage on JTAG pins, 5 V tolerant
VDD(5 V)
–0.5
5.5
V
DC input voltage on any non-supply pin
VDD(PIN)
–0.5
VDD + 0.5
V
TS
–65
150
oC
Electrostatic discharge voltage, charged device
model
VESD_CDM
–500
500
V
Electrostatic discharge voltage, human body
model
VESD_HBM
–1750
1750
V
Storage temperature
Warning This device can be damaged by electrostatic discharge (ESD) voltage.
Vitesse recommends that all integrated circuits be handled with appropriate
precautions. Failure to observe proper handling and installation procedures may
adversely affect reliability of the device.
Revision 4.3
August 2009
Page 92
VSC8641 Datasheet
Pin Descriptions
6
Pin Descriptions
The VSC8641 device is available in two package types. VSC8641XJF is an 88-pin
package. VSC8641XKO and VSC8641XKO-03 are 100-pin packages.
This section contains the pin descriptions. The pin information is also provided as
attached Microsoft Excel files. This allows you to copy the information electronically. In
Adobe Reader, double-click the attachment icon.
The following table contains notations for definitions of the various pin types.
Table 82.
Pin Type Symbols
Symbol
I
Description
Input
Input with no on-chip pull-up or pull-down resistor.
I/O
Input and Output
Input and output signal with no on-chip pull-up or
pull-down resistor.
IPU
Input with pull-up
Input with on-chip 100 kΩ pull-up resistor to VDDIO.
Input with pull-down
Input with on-chip 100 kΩ pull-down resistor to VSS.
IPD/O
Bidirectional with
pull-down
Input and output signal with on-chip 100 kΩ pull-down
resistor to VSS.
IPU/O
Bidirectional with
pull-up
Input and output signal with on-chip 100 kΩ pull-up
resistor to VDDIO or VDD33.
Output
Output signal.
OZC
Impedance controlled
output
Integrated (on-chip) source series terminated, output
signal.
OD
Open drain
Open drain output.
OS
Open source
Open source output.
IPD
O
ADIFF
Analog differential
Analog differential signal pair for twisted pair interface.
ABIAS
Analog bias
Analog bias pin.
IA
Analog input
Analog Input for sensing variable voltage levels.
Input with pull-up
Input with on-chip 100 kΩ pull-up resistor to VDD33.
These pins are 5 V tolerant.
Crystal output
Crystal clock output pin. If not used, leave unconnected.
No connect
No connect pins must be left floating.
IPU5V
OCRYST
NC
Revision 4.3
August 2009
Pin Type
Page 93
VSC8641 Datasheet
Pin Descriptions
6.1
Pin Diagram (VSC8641XJF)
The following illustration shows the pin diagram for the VSC8641XJF device.
Note The exposed pad is internally connected to ground and should be connected to
VSS on the board as well.
Figure 28.
VSS
VSS
XTAL1/REFCLK
XTAL2
VSS
VDD33
TXVND
TXVPD
TXVNC
TXVPC
VDD33
VSS
TXVNB
TXVPB
TXVNA
TXVPA
VDD12A
VDD33
REF_REXT
REF_FILT
VSS
VSS
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
VDD33
1
66
VSS
VDD33
2
65
NC
TDO
3
64
PLLMODE
TDI
4
63
REG_OUT
VDD12
5
62
REG_OUT
TMS
6
61
VDDREG
TCK
7
60
REG_EN
NTRST
8
59
OSCEN/CLKOUT
NRESET
9
58
LED0
EEDAT
10
57
LED1
EECLK
11
56
LED2
VDDIOMICRO
12
55
LED3
VDD33
VSC8641XJF
Top View
MDINT
13
54
MDC
14
53
CMODE4
MDIO
15
52
CMODE3
VDD12
16
51
CMODE2
CRS
17
50
CMODE1
COL
18
49
CMODE0
VDDIOMAC
19
48
VDD12
VSS
20
47
TX_EN
RX_DV
21
46
VDDIOMAC
RX_ER
22
45
NSRESET
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
RXD7
RXD6
RXD5
RXD4
VDDIOMAC
RXD3
RXD2
RXD1
RXD0
RX_CLK
VDDIOMAC
TX_CLK
GTX_CLK
TXD7
TXD6
TXD5
TXD4
TXD3
TXD2
TXD1
TXD0
TX_ER
Revision 4.3
August 2009
Pin Diagram for VSC8641XJF
Page 94
VSC8641 Datasheet
Pin Descriptions
6.2
Pins By Function (VSC8641XJF)
This section contains the functional pin descriptions for the VSC8641XJF device.
6.2.1
Twisted Pair Interface
The following table lists the device pins associated with the device two-wire, twisted
pair interface.
Table 83.
Twisted Pair Interface Pins
Pin
6.2.2
Name
Type
Description
73
TXVPA
ADIFF
TX/RX channel A positive signal
74
TXVNA
ADIFF
TX/RX channel A negative signal
75
TXVPB
ADIFF
TX/RX channel B positive signal
76
TXVNB
ADIFF
TX/RX channel B negative signal
79
TXVPC
ADIFF
TX/RX channel C positive signal
80
TXVNC
ADIFF
TX/RX channel C negative signal
81
TXVPD
ADIFF
TX/RX channel D positive signal
82
TXVND
ADIFF
TX/RX channel D negative signal
GMII/RGMII MAC Interface
The following table lists the device pins associated with the GMII/RGMII MAC interface.
Note that the pins in this table are referenced to VDDIOMAC and can be set to a 2.5 V or
3.3 V power supply.
Table 84.
GMII/RGMII MAC Interface Pins
Pin
Name
Type
23
24
25
26
RXD7
RXD6
RXD5
RXD4
OZC
Description
GMII Mode:
Receive data [7:4] pins. These pins are
synchronously output on the rising edge of
RX_CLK.
RGMII Mode:
Not used. Leave unconnected.
28
29
30
31
RXD3
RXD2
RXD1
RXD0
OZC
GMII Mode:
Receive data [3:0] pins. These pins are
synchronously output on the rising edge of
RX_CLK.
RGMII Mode:
Multiplexed receive data. Bits[3:0] are
synchronously output on the rising edge of
RX_CLK and bits[7:4] on the falling edge of
RX_CLK.
32
Revision 4.3
August 2009
RX_CLK
OZC
Receive clock. Receive data is sourced from the
PHY synchronously on the rising edge of RX_CLK
and is the recovered clock from the media.
Page 95
VSC8641 Datasheet
Pin Descriptions
Table 84.
GMII/RGMII MAC Interface Pins (continued)
Pin
Name
Type
22
RX_ER
OZC
Description
GMII Mode: (RX_ER)
Receive error. This output signals a receive error
from the PHY and is synchronously output on the
rising edge of RX_CLK.
RGMII Mode: (RX_CTL)
Multiplexed receive data valid, receive error. This
output is sampled by the MAC on opposite edges of
RX_CLK to indicate two receive conditions from the
PHY:
1. On the rising edge of RX_CLK, this output
serves as RXDV, signaling valid data is available on
the RXD input data bus.
2. On the falling edge of RX_CLK, this output
signals a receive error from the PHY, based on a
logical derivative of RXDV and RXER, per the
RGMII specification.
21
RX_DV
OZC
GMII Mode:
Receive data valid. This output signals a receive
data valid from the PHY and is synchronously
output on the rising edge of RX_CLK.
RGMII Mode:
Not used. Leave unconnected.
36
37
38
39
TXD7
TXD6
TXD5
TXD4
IPD
GMII Mode:
Transmit data [7:4] pins. These pins are
synchronously input on the rising edge of
GTX_CLK.
RGMII Mode:
Not used. Leave unconnected.
40
41
42
43
TXD3
TXD2
TXD1
TXD0
IPD
GMII Mode:
Transmit data [3:0] pins. These pins are
synchronously input on the rising edge of
GTX_CLK.
RGMII Mode:
Multiplexed transmit data. Bits[3:0] are
synchronously input on the rising edge of
GTX_CLK and bits[7:4] on the falling edge of
GTX_CLK.
34
TX_CLK
35
GTX_CLK
OZC
Transmit clock. This clock is 2.5 MHz for 10 Mbps
mode or 25 MHz for 100 Mbps mode.
I
GMII Mode:
Gigabit transmit clock. This clock is 125 MHz for
1000 Mbps mode, with a ±50 ppm tolerance. If
left unconnected, this pin requires a pull-down
resistor to ground.
RGMII Mode:
The transmit clock is 125 MHz for 1000 Mbps
mode, 25 MHz for 100 Mbps mode, or 2.5 MHz for
10 Mbps mode, with a ±50 ppm tolerance.
Revision 4.3
August 2009
Page 96
VSC8641 Datasheet
Pin Descriptions
Table 84.
GMII/RGMII MAC Interface Pins (continued)
Pin
Name
Type
44
TX_ER
IPD
Description
GMII Mode: (TX_ER)
Transmit error. This input is sampled by the PHY on
the rising edge of GTX_CLK, indicating a transmit
error from the MAC.
RGMII Mode: (TX_CTL)
Multiplexed transmit enable, transmit error. This
input is sampled by the PHY on opposite edges of
GTX_CLK to indicate two transmit conditions of the
MAC:
1. On the rising edge of GTX_CLK, this input
serves as TXEN, indicating valid data is available
on the TXD input data bus.
2. On the falling edge of GTX_CLK, this input
signals a transmit error from the MAC, based on a
logical derivative of TXEN and TXER, per the RGMII
specification.
47
TX_EN
IPD
GMII Mode:
Transmit enable. This input is sampled by the PHY
on the rising edge of GTX_CLK, indicating valid
data is available on the TXD input data bus.
RGMII Mode:
Not used. Leave unconnected.
17
CRS
OZC
GMII Mode:
Transmit carrier sense. This output is asserted
when a valid carrier is detected on the copper
media interface.
RGMII Mode:
Not used. Leave unconnected.
18
COL
OZC
GMII Mode:
Transmit collision. This output is asserted when a
collision is detected on the copper media interface
in half duplex operation. For full-duplex operation,
this output is driven low.
RGMII Mode:
Not used. Leave unconnected.
45
Revision 4.3
August 2009
NSRESET
IPU
Soft Reset. Active low input that places the device
in a low-power state. Although the device is
powered down, the sticky serial management
interface registers retain their value.
Page 97
VSC8641 Datasheet
Pin Descriptions
Table 84.
GMII/RGMII MAC Interface Pins (continued)
Pin
Name
Type
Description
59
OSCEN/CLKOUT
IPU/O
OSCEN. This pin is sampled on the rising edge of
NRESET. If HIGH (or left floating), then the on-chip
oscillator circuit is enabled. If LOW, the oscillator
circuit is disabled and the device must be supplied
with a 25 MHz or 125 MHz reference clock to the
REFCLK pin.
CLKOUT. After NRESET is deasserted and OSCEN
state is established, this pin becomes the clock
output. The clock output can be enabled or
disabled through a CMODE pin setting. Also, it can
generate a reference clock frequency of 125 MHz.
This pin is not active when NRESET is asserted.
When disabled, the pin is held low.
6.2.3
Serial Management Interface (SMI)
The following table lists the device pins associated with the device serial management
interface (SMI). Note that the pins in this table except NRESET are referenced to
VDDIOMICRO and can be set to a 2.5 V, or 3.3 V power supply. The NRESET pin is
referenced to VDD33.
Table 85.
Revision 4.3
August 2009
SMI Pins
Pin
Name
14
MDC
Type
IPU
Description
Management data clock. A 0 MHz to 12.5 MHz
reference input is used to clock serial MDIO data into
and out of the PHY.
15
MDIO
I/O
Management data input/output pin. Serial data is
written or read from this pin bidirectionally between
the PHY and station manager, synchronously on the
positive edge of MDC. One external pull-up resistor
is required at the station manager, and its value
depends on the MDC clock frequency and the total
sum of the capacitive loads from the MDIO pins.
13
MDINT
OS/OD
Management interrupt signal. After reset, the device
configures this pin, along with others from other
devices, as active-low (open drain) or active-high
(open source) based on the polarity of an external
10 kΩ resistor connection. These pins can be tied
together in a wired-OR configuration with only a
single pull-up or pull-down resistor.
10
EEDAT
IPD/O
(Optional) EEPROM serial I/O data. Used to
configure PHYs in a system without a station
manager. Connect to the SDA pin of the ATMEL
“AT24CXXX” serial EEPROM device family.
The VSC8641 determines that an external EEPROM
is present by monitoring the EEDAT pin at power-up
or when NRESET is de-asserted. If EEDAT has a
4.7 kΩ external pull-up resistor, the VSC8641
assumes an EEPROM is present. The EEDAT pin can
be left floating or grounded to indicate no EEPROM.
Page 98
VSC8641 Datasheet
Pin Descriptions
Table 85.
6.2.4
SMI Pins (continued)
Pin
Name
Type
Description
11
EECLK
OZC
(Optional) EEPROM Serial Output Clock. Used to
configure PHYs in a system without a station
manager. Connect to the SCL pin of the ATMEL
“AT24CXXX” serial EEPROM device family.
9
NRESET
IPU
Device Reset. Active low input that powers down the
device and sets the register bits to their default
state.
JTAG
The following table lists the device pins associated with the device JTAG testing facility.
Table 86.
6.2.5
JTAG Pins
Pin
Name
Type
Description
4
TDI
IPU5V
JTAG test serial data input.
3
TDO
O
6
TMS
IPU5V
JTAG test mode select.
JTAG test serial data output.
7
TCK
IPU5V
JTAG test clock input.
8
NTRST
IPU5V
JTAG reset. If JTAG is not used, then tie this pin
to VSS (ground) with a pull-down resistor.
Miscellaneous
The following table lists the device pins associated with a particular interface or facility
on the device.
Table 87.
Revision 4.3
August 2009
Miscellaneous Pins
Pin
Name
Type
Description
53
52
51
50
49
CMODE4
CMODE3
CMODE2
CMODE1
CMODE0
IA
Configuration mode (CMODE) pins. For more information,
see “CMODE,” page 68.
86
XTAL1/REFCLK
I
Crystal oscillator input. If OSCEN=high, then a 25 MHz
parallel resonant crystal with ±50 ppm frequency tolerance
should be connected across XTAL1 and XTAL2. A 33 pF
capacitor should also tie the XTAL1 pin to ground.
Reference clock input. If OSCEN=low, the clock input
frequency can either be 25 MHz (PLLMODE=0) or 125 MHz
(PLLMODE is high).
85
XTAL2
OCRYST
Crystal oscillator output. The crystal should be connected
across XTAL1 and XTAL2. A 33 pF capacitor should also tie
the XTAL2 pin to ground. If not using a crystal oscillator,
this output pin can be left floating if driving XTAL1/REFCLK
with a reference clock.
Page 99
VSC8641 Datasheet
Pin Descriptions
Table 87.
6.2.6
Miscellaneous Pins (continued)
Pin
Name
Type
64
PLLMODE
I
PLL mode input select. Sampled on power-up or reset. If
PLLMODE is low, then REFCLK must be 25 MHz. If
PLLMODE is high, then REFCLK must be 125 MHz.
If a crystal or an external 25 MHz clock is used, PLLMODE
must be pulled low. If an external 125 MHz clock is used,
PLLMODE must be pulled high.
55
56
57
58
LED3
LED2
LED1
LED0
O
LED direct-drive outputs. All LED pins are active-low. For
more information about LED operation, see “LED
Interface,” page 31.
70
REF_REXT
ABIAS
Reference external connects to an external 2 kΩ (1%)
resistor to analog ground.
69
REF_FILT
ABIAS
Reference filter connects to an external 1 μF capacitor to
analog ground.
60
REG_EN
I
Regulator enable. Active high input enables the on-chip
switching regulator and generates a 1.2 V supply voltage.
62, 63
REG_OUT
ABIAS
Regulator output. When REG_EN is enabled, REG_OUT
supplies a 1.2 V supply that has been regulated from the
3.3 V supply. When connecting to the 1.2 V supply pins,
additional requirements are a 4.7 µH to 5.1 μH inductor in
series as well as 10 µF and 1 µF capacitors to ground. The
on-chip switching regulator is optional, and 1.2 V power
can be supplied externally.
65
NC
NC
Description
No connect. Do not connect them together or to ground.
Leave these pins unconnected (floating).
Power Supply
The following table lists the device power supply pins.
Table 88.
Power Supply Pins
Pin
Name
Type
Description
1, 2, 54, 71, 78, 83
VDD33
3.3 V
General 3.3 V supply.
61
VDDREG
3.3 V
On-chip switching regulator 3.3 V supply.
12
VDDIOMICRO
3.3 V
2.5 V
I/O micro power supply.
19, 27, 33, 46
VDDIOMAC
3.3 V
2.5 V
I/O MAC power supply.
5, 16, 48
VDD12
1.2 V
Internal digital core voltage.
72
VDD12A
1.2 V
1.2 V analog power requiring additional
PCB power supply filtering.
PAD (1)
20, 66, 67, 68, 77,
84, 87, 88
VSS
0V
General device ground.
1. Exposed pad on the bottom of the package.
Revision 4.3
August 2009
Page 100
VSC8641 Datasheet
Pin Descriptions
6.2.7
Power Supply and Associated Function
Although certain function pins may not be used for a specific application, all power
supply pins must be connected to their respective voltage input.
Table 89.
Revision 4.3
August 2009
Power Supply Pins and Associated Function Pins
Pins
Nominal Voltage
Associated Function Pins
VDD33
3.3 V
LED[2:0], CLKOUT, NRESET, JTAG (5), XTAL1, XTAL2,
CMODE, TXVP, TXVN, REF_FILT, REF_REXT, OSCEN,
PLLMODE, REG_EN, REF_CLK
VDDIOMICRO
2.5 V, 3.3 V
MDC, MDIO, MDINT, EECLK, EEDAT
VDDIOMAC
2.5 V, 3.3 V
RXD, RX_CTL, RX_CLK, TXD, TX_CTL, TX_CLK, NSRESET
Page 101
VSC8641 Datasheet
Pin Descriptions
6.3
Pins by Number (VSC8641XJF)
This section provides a numeric list of the VSC8641XJF pins.
Revision 4.3
August 2009
1
VDD33
39
TXD4
77
VSS
2
VDD33
40
TXD3
78
VDD33
3
TDO
41
TXD2
79
TXVPC
4
TDI
42
TXD1
80
TXVNC
5
VDD12
43
TXD0
81
TXVPD
6
TMS
44
TX_ER
82
TXVND
7
TCK
45
NSRESET
83
VDD33
8
NTRST
46
VDDIOMAC
84
VSS
9
NRESET
47
TX_EN
85
XTAL2
10
EEDAT
48
VDD12
86
XTAL1/REFCLK
11
EECLK
49
CMODE0
87
VSS
12
VDDIOMICRO
50
CMODE1
88
VSS
13
MDINT
51
CMODE2
14
MDC
52
CMODE3
15
MDIO
53
CMODE4
16
VDD12
54
VDD33
17
CRS
55
LED3
18
COL
56
LED2
19
VDDIOMAC
57
LED1
20
VSS
58
LED0
21
RX_DV
59
OSCEN /CLKOUT
22
RX_ER
60
REG_EN
23
RXD7
61
VDDREG
24
RXD6
62
REG_OUT
25
RXD5
63
REG_OUT
26
RXD4
64
PLLMODE
27
VDDIOMAC
65
NC
28
RXD3
66
VSS
29
RXD2
67
VSS
30
RXD1
68
VSS
31
RXD0
69
REF_FILT
32
RX_CLK
70
REF_REXT
33
VDDIOMAC
71
VDD33
34
TX_CLK
72
VDD12A
35
GTX_CLK
73
TXVPA
36
TXD7
74
TXVNA
37
TXD6
75
TXVPB
38
TXD5
76
TXVNB
Page 102
VSC8641 Datasheet
Pin Descriptions
6.4
Pins by Name (VSC8641XJF)
This section provides an alphabetical list of the VSC8641XJF pins.
Revision 4.3
August 2009
CMODE0
49
RXD7
23
VDDIOMICRO
12
CMODE1
50
TCK
7
VDDREG
61
CMODE2
51
TDI
4
VSS
20
CMODE3
52
TDO
3
VSS
66
CMODE4
53
TMS
6
VSS
67
COL
18
TX_CLK
34
VSS
68
CRS
17
TX_EN
47
VSS
77
EECLK
11
TX_ER
44
VSS
84
EEDAT
10
TXD0
43
VSS
87
GTX_CLK
35
TXD1
42
VSS
88
LED0
58
TXD2
41
XTAL1/REFCLK
86
LED1
57
TXD3
40
XTAL2
85
LED2
56
TXD4
39
LED3
55
TXD5
38
MDC
14
TXD6
37
MDINT
13
TXD7
36
MDIO
15
TXVNA
74
NC
65
TXVNB
76
NRESET
9
TXVNC
80
NSRESET
45
TXVND
82
NTRST
8
TXVPA
73
OSCEN /CLKOUT
59
TXVPB
75
PLLMODE
64
TXVPC
79
REF_FILT
69
TXVPD
81
REF_REXT
70
VDD12
5
REG_EN
60
VDD12
16
REG_OUT
62
VDD12
48
REG_OUT
63
VDD33
1
RX_CLK
32
VDD33
2
RX_DV
21
VDD33
54
RX_ER
22
VDD33
71
RXD0
31
VDD33
78
RXD1
30
VDD33
83
RXD2
29
VDD12A
72
RXD3
28
VDDIOMAC
19
RXD4
26
VDDIOMAC
27
RXD5
25
VDDIOMAC
33
RXD6
24
VDDIOMAC
46
Page 103
VSC8641 Datasheet
Pin Descriptions
6.5
Pin Diagram (VSC8641XKO, VSC8641XKO-03)
The following illustration shows the pin diagram for the VSC8641XKO and
VSC8641XKO-03 devices.
Note The exposed pad is internally connected to ground and should be connected to
VSS on the board as well.
Figure 29.
Pin Diagram for VSC8641XKO and VSC8641XKO-03
NC
NC
NC
NC
REF_FILT
REF_REXT
VDD33
VDD12A
TXVPA
TXVNA
TXVPB
TXVNB
VDD33
TXVPC
TXVNC
TXVPD
TXVND
VDD33
XTAL2
XTAL1/REFCLK
NC
NC
NC
NC
NC
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
NC
NC
VDD33
VDD33
TDO
TDI
VDD12
VDD12
TMS
TCK
NTRST
NRESET
EEDAT
EECLK
VDDIOMICRO
MDINT
MDC
MDIO
VDD12
VDD12
CRS
COL
VDDIOMAC
NC
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
VSC8641XKO
VSC8641XKO-03
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
NC
NC
NC
NC
PLLMODE
REG_OUT
REG_OUT
VDDREG
REG_EN
OSCEN/CLKOUT
LED0
LED1
LED2
LED3
VDD33
CMODE4
CMODE3
CMODE2
CMODE1
CMODE0
VDD12
TX_EN
VDDIOMAC
NC
NC
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
NSRESET
TX_ER
TXD0
TXD1
TXD2
TXD3
TXD4
TXD5
TXD6
TXD7
GTX_CLK
TX_CLK
VDDIOMAC
RX_CLK
RXD0
RXD1
RXD2
RXD3
VDDIOMAC
RXD4
RXD5
RXD6
RXD7
RX_ER
RX_DV
Revision 4.3
August 2009
Page 104
VSC8641 Datasheet
Pin Descriptions
6.6
Pins by Function (VSC8641XKO, VSC8641XKO-03)
This section contains the functional pin descriptions for the VSC8641XKO and
VSC8641XKO-03 devices.
6.6.1
Twisted Pair Interface
The following table lists the device pins associated with the device two-wire, twisted
pair interface.
Table 90.
6.6.2
Twisted Pair Interface Pins
Pin
Name
Type
Description
84
TXVPA
ADIFF
TX/RX channel A positive signal
85
TXVNA
ADIFF
TX/RX channel A negative signal
86
TXVPB
ADIFF
TX/RX channel B positive signal
87
TXVNB
ADIFF
TX/RX channel B negative signal
89
TXVPC
ADIFF
TX/RX channel C positive signal
90
TXVNC
ADIFF
TX/RX channel C negative signal
91
TXVPD
ADIFF
TX/RX channel D positive signal
92
TXVND
ADIFF
TX/RX channel D negative signal
GMII/RGMII MAC Interface
The following table lists the device pins associated with the GMII/RGMII MAC interface.
Note that the pins in this table are referenced to VDDIOMAC and can be set to a 2.5 V or
3.3 V power supply.
Table 91.
GMII/RGMII MAC Interface Pins
Pin
Name
Type
28
29
30
31
RXD7
RXD6
RXD5
RXD4
OZC
Description
GMII Mode:
Receive data [7:4] pins. These pins are
synchronously output on the rising edge of
RX_CLK.
RGMII Mode:
Not used. Leave unconnected.
33
34
35
36
RXD3
RXD2
RXD1
RXD0
OZC
GMII Mode:
Receive data [3:0] pins. These pins are
synchronously output on the rising edge of
RX_CLK.
RGMII Mode:
Multiplexed receive data. Bits[3:0] are
synchronously output on the rising edge of
RX_CLK and bits[7:4] on the falling edge of
RX_CLK.
37
Revision 4.3
August 2009
RX_CLK
OZC
Receive clock. Receive data is sourced from the
PHY synchronously on the rising edge of RX_CLK
and is the recovered clock from the media.
Page 105
VSC8641 Datasheet
Pin Descriptions
Table 91.
GMII/RGMII MAC Interface Pins (continued)
Pin
Name
Type
27
RX_ER
OZC
Description
GMII Mode: (RX_ER)
Receive error. This output signals a receive error
from the PHY and is synchronously output on the
rising edge of RX_CLK.
RGMII Mode: (RX_CTL)
Multiplexed receive data valid, receive error. This
output is sampled by the MAC on opposite edges of
RX_CLK to indicate two receive conditions from the
PHY:
1. On the rising edge of RX_CLK, this output
serves as RXDV, signaling valid data is available on
the RXD input data bus.
2. On the falling edge of RX_CLK, this output
signals a receive error from the PHY, based on a
logical derivative of RXDV and RXER, per the
RGMII specification.
26
RX_DV
OZC
GMII Mode:
Receive data valid. This output signals a receive
data valid from the PHY and is synchronously
output on the rising edge of RX_CLK.
RGMII Mode:
Not used. Leave unconnected.
41
42
43
44
TXD7
TXD6
TXD5
TXD4
IPD
GMII Mode:
Transmit data [7:4] pins. These pins are
synchronously input on the rising edge of
GTX_CLK.
RGMII Mode:
Not used. Leave unconnected.
45
46
47
48
TXD3
TXD2
TXD1
TXD0
IPD
GMII Mode:
Transmit data [3:0] pins. These pins are
synchronously input on the rising edge of
GTX_CLK.
RGMII Mode:
Multiplexed transmit data. Bits[3:0] are
synchronously input on the rising edge of
GTX_CLK and bits[7:4] on the falling edge of
GTX_CLK.
39
TX_CLK
40
GTX_CLK
OZC
Transmit clock. This clock is 2.5 MHz for 10 Mbps
mode or 25 MHz for 100 Mbps mode.
I
GMII Mode:
Gigabit transmit clock. This clock is 125 MHz for
1000 Mbps mode, with a ±50 ppm tolerance. If
left unconnected, this pin requires a pull-down
resistor to ground.
RGMII Mode:
The transmit clock is 125 MHz for 1000 Mbps
mode, 25 MHz for 100 Mbps mode, or 2.5 MHz for
10 Mbps mode, with a ±50 ppm tolerance.
Revision 4.3
August 2009
Page 106
VSC8641 Datasheet
Pin Descriptions
Table 91.
GMII/RGMII MAC Interface Pins (continued)
Pin
Name
Type
49
TX_ER
IPD
Description
GMII Mode: (TX_ER)
Transmit error. This input is sampled by the PHY on
the rising edge of GTX_CLK, indicating a transmit
error from the MAC.
RGMII Mode: (TX_CTL)
Multiplexed transmit enable, transmit error. This
input is sampled by the PHY on opposite edges of
GTX_CLK to indicate two transmit conditions of the
MAC:
1. On the rising edge of GTX_CLK, this input
serves as TXEN, indicating valid data is available
on the TXD input data bus.
2. On the falling edge of GTX_CLK, this input
signals a transmit error from the MAC, based on a
logical derivative of TXEN and TXER, per the RGMII
specification.
54
TX_EN
IPD
GMII Mode:
Transmit enable. This input is sampled by the PHY
on the rising edge of GTX_CLK, indicating valid
data is available on the TXD input data bus.
RGMII Mode:
Not used. Leave unconnected.
21
CRS
OZC
GMII Mode:
Transmit carrier sense. This output is asserted
when a valid carrier is detected on the copper
media interface.
RGMII Mode:
Not used. Leave unconnected.
22
COL
OZC
GMII Mode:
Transmit collision. This output is asserted when a
collision is detected on the copper media interface
in half duplex operation. For full-duplex operation,
this output is driven low.
RGMII Mode:
Not used. Leave unconnected.
50
Revision 4.3
August 2009
NSRESET
IPU
Soft Reset. Active low input that places the device
in a low-power state. Although the device is
powered down, the sticky serial management
interface registers retain their value.
Page 107
VSC8641 Datasheet
Pin Descriptions
Table 91.
GMII/RGMII MAC Interface Pins (continued)
Pin
Name
Type
Description
66
OSCEN/CLKOUT
IPU/O
OSCEN. This pin is sampled on the rising edge of
NRESET. If HIGH (or left floating), then the on-chip
oscillator circuit is enabled. If LOW, the oscillator
circuit is disabled and the device must be supplied
with a 25 MHz or 125 MHz reference clock to the
REFCLK pin.
CLKOUT. After NRESET is deasserted and OSCEN
state is established, this pin becomes the clock
output. The clock output can be enabled or
disabled through a CMODE pin setting. Also, it can
generate a reference clock frequency of 125 MHz.
This pin is not active when NRESET is asserted.
When disabled, the pin is held low.
6.6.3
Serial Management Interface (SMI)
The following table lists the device pins associated with the device serial management
interface (SMI). Note that the pins in this table except NRESET are referenced to
VDDIOMICRO and can be set to a 2.5 V, or 3.3 V power supply. The NRESET pin is
referenced to VDD33.
Table 92.
Revision 4.3
August 2009
SMI Pins
Pin
Name
17
MDC
Type
IPU
Description
Management data clock. A 0 MHz to 12.5 MHz reference input is
used to clock serial MDIO data into and out of the PHY.
18
MDIO
I/O
Management data input/output pin. Serial data is written or read
from this pin bidirectionally between the PHY and station
manager, synchronously on the positive edge of MDC. One
external pull-up resistor is required at the station manager, and
its value depends on the MDC clock frequency and the total sum
of the capacitive loads from the MDIO pins.
16
MDINT
OS/OD
Management interrupt signal. After reset, the device configures
this pin, along with others from other devices, as active-low
(open drain) or active-high (open source) based on the polarity
of an external 10 kΩ resistor connection. These pins can be tied
together in a wired-OR configuration with only a single pull-up or
pull-down resistor.
13
EEDAT
IPD/O
(Optional) EEPROM serial I/O data. Used to configure PHYs in a
system without a station manager. Connect to the SDA pin of
the ATMEL “AT24CXXX” serial EEPROM device family.
The VSC8641 determines that an external EEPROM is present by
monitoring the EEDAT pin at power-up or when NRESET is
de-asserted. If EEDAT has a 4.7 kΩ external pull-up resistor, the
VSC8641 assumes an EEPROM is present. The EEDAT pin can be
left floating or grounded to indicate no EEPROM.
14
EECLK
OZC
(Optional) EEPROM Serial Output Clock. Used to configure PHYs
in a system without a station manager. Connect to the SCL pin
of the ATMEL “AT24CXXX” serial EEPROM device family.
12
NRESET
IPU
Device Reset. Active low input that powers down the device and
sets the register bits to their default state.
Page 108
VSC8641 Datasheet
Pin Descriptions
6.6.4
JTAG
The following table lists the device pins associated with the device JTAG testing facility.
Table 93.
6.6.5
JTAG Pins
Pin
Name
Type
Description
6
TDI
IPU5V
JTAG test serial data input.
5
TDO
O
9
TMS
IPU5V
JTAG test mode select.
10
TCK
IPU5V
JTAG test clock input.
11
NTRST
IPU5V
JTAG reset. If JTAG is not used, then tie this pin
to VSS (ground) with a pull-down resistor.
JTAG test serial data output.
Miscellaneous
The following table lists the device pins associated with a particular interface or facility
on the device.
Table 94.
Revision 4.3
August 2009
Miscellaneous Pins
Pin
Name
60
59
58
57
56
CMODE4
CMODE3
CMODE2
CMODE1
CMODE0
Type
IA
Description
Configuration mode (CMODE) pins. For more information,
see “CMODE,” page 68.
95
XTAL1/REFCLK
I
Crystal oscillator input. If OSCEN=high, then a 25 MHz
parallel resonant crystal with ±50 ppm frequency tolerance
should be connected across XTAL1 and XTAL2. A 33 pF
capacitor should also tie the XTAL1 pin to ground.
Reference clock input. If OSCEN=low, the clock input
frequency can either be 25 MHz (PLLMODE=0) or 125 MHz
(PLLMODE is high).
94
XTAL2
OCRYST
Crystal oscillator output. The crystal should be connected
across XTAL1 and XTAL2. A 33 pF capacitor should also tie
the XTAL2 pin to ground. If not using a crystal oscillator,
this output pin can be left floating if driving XTAL1/REFCLK
with a reference clock.
71
PLLMODE
I
PLL mode input select. Sampled on power-up or reset. If
PLLMODE is low, then REFCLK must be 25 MHz. If
PLLMODE is high, then REFCLK must be 125 MHz.
If a crystal or an external 25 MHz clock is used, PLLMODE
must be pulled low. If an external 125 MHz clock is used,
PLLMODE must be pulled high.
62
63
64
65
LED3
LED2
LED1
LED0
O
LED direct-drive outputs. All LED pins are active-low. For
more information about LED operation, see “LED
Interface,” page 31.
81
REF_REXT
ABIAS
Reference external connects to an external 2 kΩ (1%)
resistor to analog ground.
80
REF_FILT
ABIAS
Reference filter connects to an external 1 μF capacitor to
analog ground.
Page 109
VSC8641 Datasheet
Pin Descriptions
Table 94.
6.6.6
Miscellaneous Pins (continued)
Pin
Name
67
REG_EN
69, 70
REG_OUT
1, 2,
24, 51,
52, 72,
73, 74,
75, 76,
77, 78,
79, 96,
97, 98,
99, 100
NC
Type
Description
I
Regulator enable. Active high input enables the on-chip
switching regulator and generates a 1.2 V supply voltage.
ABIAS
Regulator output. When REG_EN is enabled, REG_OUT
supplies a 1.2 V supply that has been regulated from the
3.3 V supply. When connecting to the 1.2 V supply pins,
additional requirements are a 4.7 µH to 5.1 μH inductor in
series as well as 10 µF and 1 µF capacitors to ground. The
on-chip switching regulator is optional, and 1.2 V power
can be supplied externally.
NC
No connect. Do not connect them together or to ground.
Leave these pins unconnected (floating).
Power Supply
The following table lists the device power supply pins.
Table 95.
Power Supply Pins
Pin
Name
Type
Description
3, 4, 61, 82, 88, 93
VDD33
3.3 V
General 3.3 V supply.
68
VDDREG
3.3 V
On-chip switching regulator 3.3 V supply.
15
VDDIOMICRO
3.3 V
2.5 V
I/O micro power supply.
23, 32, 38, 53
VDDIOMAC
3.3 V
2.5 V
I/O MAC power supply.
7, 8, 19, 20, 55
VDD12
1.2 V
Internal digital core voltage.
83
VDD12A
1.2 V
1.2 V analog power requiring additional PCB
power supply filtering.
25, PAD(1)
VSS
0V
General device ground.
1. Exposed pad on the bottom of the package.
Revision 4.3
August 2009
Page 110
VSC8641 Datasheet
Pin Descriptions
6.6.7
Power Supply and Associated Function
Although certain function pins may not be used for a specific application, all power
supply pins must be connected to their respective voltage input.
Table 96.
Revision 4.3
August 2009
Power Supply Pins and Associated Function Pins
Pins
Nominal Voltage
Associated Function Pins
VDD33
3.3 V
LED[2:0], CLKOUT, NRESET, JTAG (5), XTAL1, XTAL2,
CMODE, TXVP, TXVN, REF_FILT, REF_REXT, OSCEN,
PLLMODE, REG_EN, REF_CLK
VDDIOMICRO
2.5 V, 3.3 V
MDC, MDIO, MDINT, EECLK, EEDAT
VDDIOMAC
2.5 V, 3.3 V
RXD, RX_CTL, RX_CLK, TXD, TX_CTL, TX_CLK, NSRESET
Page 111
VSC8641 Datasheet
Pin Descriptions
6.7
Pins by Number (VSC8641XKO, VSC8641XKO-03)
This section provides a numeric list of the VSC8641XKO and VSC8641XKO-03 pins.
Revision 4.3
August 2009
1
NC
39
TX_CLK
77
NC
2
NC
40
GTX_CLK
78
NC
3
VDD33
41
TXD7
79
NC
4
VDD33
42
TXD6
80
REF_FILT
5
TDO
43
TXD5
81
REF_REXT
6
TDI
44
TXD4
82
VDD33
7
VDD12
45
TXD3
83
VDD12A
8
VDD12
46
TXD2
84
TXVPA
9
TMS
47
TXD1
85
TXVNA
10
TCK
48
TXD0
86
TXVPB
11
NTRST
49
TX_ER
87
TXVNB
12
NRESET
50
NSRESET
88
VDD33
13
EEDAT
51
NC
89
TXVPC
14
EECLK
52
NC
90
TXVNC
15
VDDIOMICRO
53
VDDIOMAC
91
TXVPD
16
MDINT
54
TX_EN
92
TXVND
17
MDC
55
VDD12
93
VDD33
18
MDIO
56
CMODE0
94
XTAL2
19
VDD12
57
CMODE1
95
XTAL1/REFCLK
20
VDD12
58
CMODE2
96
NC
21
CRS
59
CMODE3
97
NC
22
COL
60
CMODE4
98
NC
23
VDDIOMAC
61
VDD33
99
NC
24
NC
62
LED3
100 NC
25
VSS
63
LED2
26
RX_DV
64
LED1
27
RX_ER
65
LED0
28
RXD7
66
OSCEN/CLKOUT
29
RXD6
67
REG_EN
30
RXD5
68
VDDREG
31
RXD4
69
REG_OUT
32
VDDIOMAC
70
REG_OUT
33
RXD3
71
PLLMODE
34
RXD2
72
NC
35
RXD1
73
NC
36
RXD0
74
NC
37
RX_CLK
75
NC
38
VDDIOMAC
76
NC
Page 112
VSC8641 Datasheet
Pin Descriptions
6.8
Pins by Name (VSC8641XKO, VSC8641XKO-03)
This section provides an alphabetical list of the VSC8641XKO and VSC8641XKO-03
pins.
56
NTRST
11
TXVND
92
CMODE1
57
OSCEN/CLKOUT
66
TXVPA
84
CMODE2
58
PLLMODE
71
TXVPB
86
CMODE3
59
REF_FILT
80
TXVPC
89
CMODE4
60
REF_REXT
81
TXVPD
91
COL
22
REG_EN
67
VDD12
7
CRS
21
REG_OUT
69
VDD12
8
EECLK
14
REG_OUT
70
VDD12
19
EEDAT
13
RX_CLK
37
VDD12
20
GTX_CLK
40
RX_DV
26
VDD12
55
LED0
65
RX_ER
27
VDD33
3
LED1
64
RXD0
36
VDD33
4
LED2
63
RXD1
35
VDD33
61
LED3
62
RXD2
34
VDD33
82
MDC
17
RXD3
33
VDD33
88
MDINT
16
RXD4
31
VDD33
93
MDIO
18
RXD5
30
VDD12A
83
NC
1
RXD6
29
VDDIOMAC
23
NC
2
RXD7
28
VDDIOMAC
32
NC
24
TCK
10
VDDIOMAC
38
NC
51
TDI
6
VDDIOMAC
53
NC
52
TDO
5
VDDIOMICRO
15
NC
72
TMS
9
VDDREG
68
NC
73
TX_CLK
39
VSS
25
NC
74
TX_EN
54
XTAL1/REFCLK
95
NC
75
TX_ER
49
XTAL2
94
NC
76
TXD0
48
NC
77
TXD1
47
NC
78
TXD2
46
NC
79
TXD3
45
NC
96
TXD4
44
NC
97
TXD5
43
NC
98
TXD6
42
NC
99
TXD7
41
NC
100
TXVNA
85
NRESET
12
TXVNB
87
NSRESET
50
TXVNC
90
CMODE0
Revision 4.3
August 2009
Page 113
VSC8641 Datasheet
Package Information
7
Package Information
The VSC8641 device is available in two package types. VSC8641XJF is a lead(Pb)-free,
88-pin, plastic quad flat no-lead (QFN) package with an exposed pad, 10 mm × 10 mm
body size, 0.4 mm pin pitch, and 0.9 mm maximum height. VSC8641XKO and
VSC8641XKO-03 are packaged in a 100-pin, plastic low-profile quad flat package
(LQFP) with an exposed pad, 12 mm × 12 mm body size, 1.4 mm body thickness,
0.4 mm pin pitch, and 1.6 mm maximum height.
Lead(Pb)-free products from Vitesse comply with the temperatures and profiles defined
in the joint IPC and JEDEC standard IPC/JEDEC J-STD-020. For more information, see
the IPC and JEDEC standard.
This section provides the package drawings, thermal specifications, and moisture
sensitivity ratings for the devices.
7.1
Package Drawings
The following illustrations show the package drawings for the devices. The drawings
contain the top view, bottom view, side view, detail views, dimensions, tolerances, and
notes.
Revision 4.3
August 2009
Page 114
VSC8641 Datasheet
Package Information
Figure 30.
Package Drawing for VSC8641XJF
Top View
Bottom View
0.10 C B (2×)
D
Pin 1
identification
A
D1
88
67
1
Pin 1 identification
0.20 R
D2
L
67
66
88
1
66
5
E1
22
E2
E
45
23
44
B
0.42 ±0.18
45
0.10 C A (2×)
22
44
b
e
2
23
0.10 M C A B
Side View
Detail A
A2 A
12°
C
0.05 C
Detail A
Notes
1. All dimensions and tolerances are in millimeters (mm).
2. Dimension applies to plated terminal and is measured
0.13 mm to 0.23 mm from the terminal tip.
3. Package warpage maximum is 0.08 mm.
4. Package corners are R0.175 ±0.025 mm.
5. Embedded lead radius is 0.065 mm.
Revision 4.3
August 2009
Seating plane
A1 A3
Dimensions and Tolerances
Reference
A
A1
A2
A3
D
E
D1
E1
D2
E2
e
b
L
Minimum
7.10
7.10
0.13
0.30
Nominal
0.01
0.65
0.20 REF
10.00 BSC
10.00 BSC
9.75 BSC
9.75 BSC
7.30
7.30
0.40 BSC
0.18
0.40
Maximum
0.90
0.05
0.70
7.50
7.50
0.23
0.50
Page 115
VSC8641 Datasheet
Package Information
Figure 31.
Package Drawing for VSC8641XKO and VSC8641XKO-03
Top View
D
D1
D2
Bottom View
D
75
1
51
76
25
100
50
26
6.000
B
E
E1
E2
6.000
A
26
100
1
25
e
4×
b
bbb H A-B D
ddd M C A-B S D S
Side View
0
1
76
aaa C A-B D
4×
L1
A1
ccc C
See Detail A
Seating
C plane
Detail A
-2
0
R1
R2
H
S
0
0.25
L
Gage plane
c
3
Notes
1. All dimensions and tolerances are in millimeters (mm).
2. Dimensions D1 and E1 do not include mold protrusion.
Allowable protrusion is 0.25 mm per side. D1 and E1
are maximum plastic body size dimensions including
mold mismatch.
3. Dimension b does not include dambar protrusion.
Allowable dambar protrusion does not cause the lead
width to exceed the maximum b dimension by more
than 0.08 mm.
Revision 4.3
August 2009
75
51
Exposed
pad
0.05 S
A2 A
0
50
Dimensions and Tolerances
Reference Minimum Nominal Maximum
A
1.60
A1
0.15
0.05
1.40
A2
1.45
1.35
14.00
D
12.00
D1
14.00
E
12.00
E1
R2
0.08
0.20
R1
0.08
0
0o
3.5o
7o
0
-1
0o
0
-2
11o
12o
13o
0
-3
11o
12o
13o
c
0.09
0.20
L
0.45
0.60
0.75
L1
1.00
S
0.20
b
0.13
0.16
0.23
e
0.40
D2
9.60
E2
9.60
aaa
0.20
bbb
0.20
ccc
0.08
ddd
0.07
Page 116
VSC8641 Datasheet
Package Information
7.2
Thermal Specifications
Thermal specifications for this device are based on the JEDEC standard EIA/JESD51-2
and have been modeled using a four-layer test board with two signal layers, a power
plane, ad a ground plane (2s2p PCB). For more information, see the JEDEC standard.
Table 97.
Thermal Resistances
θJA (°C/W) vs. Airflow (ft/min)
θJC
θJB
0
100
200
VSC8641XJF
7 (1)
3.2 (2)
16.7
24
22
19.5
VSC8641XKO
14.7(1)
6.4(2)
19
29
26
25
VSC8641XKO-03
14.7(1)
6.4(2)
19
29
26
25
Part Order Number
1. Simulated on the top of the mold compound with the exposed pad soldered to a ground pad on
the PCB.
2. Calculated on the exposed pad soldered to a ground pad on the PCB.
To achieve results similar to the modeled thermal resistance measurements, the
guidelines for board design described in the JEDEC standard EIA/JESD51 series must be
applied. For information about specific applications, see the following:
EIA/JESD51-5, Extension of Thermal Test Board Standards for Packages with Direct
Thermal Attachment Mechanisms
EIA/JESD51-7, High Effective Thermal Conductivity Test Board for Leaded Surface
Mount Packages
EIA/JESD51-9, Test Boards for Area Array Surface Mount Package Thermal
Measurements
EIA/JESD51-10, Test Boards for Through-Hole Perimeter Leaded Package Thermal
Measurements
EIA/JESD51-11, Test Boards for Through-Hole Area Array Leaded Package Thermal
Measurements
7.3
Moisture Sensitivity
This device is rated moisture sensitivity level 3 or better as specified in the joint IPC
and JEDEC standard IPC/JEDEC J-STD-020. For more information, see the IPC and
JEDEC standard.
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Design Considerations
8
Design Considerations
This section explains various issues associated with the VSC8641 device.
8.1
RX_CLK Can Reach as High as 55% Duty Cycle
Issue: When register 23, bit 8 = 0 (no internal clock skew) for RGMII, then the RX_CLK
duty cycle has been measured as high as 55%.
Implications: There is a possibility that the duty cycle can go beyond this value, which
then violates what is specified in the datasheet. This has only been observed when the
skew setting is set to 0.
Workaround: Avoid using an RGMII skew setting of 0.
8.2
First SMI Write Fails after Software Reset
Issue: After applying software reset (using either register 0, bit 15 or the NSRESET
pin), the first subsequent SMI write operation into register 4 (auto-negotiation
advertisement) or register 9 (1000BASE-T control) does not work. This issue only
occurs if the first SMI write after software reset is into register 4 or 9. This issue does
not occur if any kind of SMI transaction (either read or write) is applied to any register
between the time of the software reset and the SMI write into register 4 or 9.
Implications: The PHY may operate unexpectedly, because settings for registers 4
and 9 remain at the reset value. There are no such implications after either hardware
reset or power-down events.
Workaround: Writing “0x0000” into register 31 after every software reset avoids this
issue, and subsequent SMI writes into register 4 or 9 succeed.
8.3
Link-Up Issue In Forced 100BASE-TX Mode
Issue: While in the forced 100BASE-TX mode with the automatic crossover detection
feature (HP Auto-MDIX) enabled, it can take up to several minutes for the link-up
process between the VSC8641 device and a link partner that also has its automatic
crossover detection feature enabled. The problem has not been observed in any other
operation modes.
Implications: While working against some link partners, such as those by Marvell, it can
take up to several minutes for the link-up process to complete.
Workaround: When forcing 100BASE-TX mode, use the following script to alter the
internal method that the VSC8641 uses to perform crossover detection. For more
information, see PHY API Software and Programmers Guide, which is available on the
Vitesse Web site at www.vitesse.com.
PhyWrite (PortNo, reg_num(dec), 16_bit_unsigned_data(hex))
PhyWriteMsk (PortNo, reg_num(dec), 16_bit_unsigned_data(hex), mask(hex))
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PhyWrite (PortNo, 31, 0x52B5); // Select internal register page
PhyWrite (PortNo, 16, 0xA7F8); // Request read of internal register
PhyWriteMsk (PortNo, 17, 0x0018, 0x0018); // Set for forced 100BASE-TX
PhyWriteMsk (PortNo, 18, 0, 0); // Necessary read & re-write register 18
PhyWrite (PortNo, 16, 0x87F8); // Write back modified internal register
PhyWrite (PortNo, 31, 0); // Select main register page
When returning from forced 100BASE-TX mode to auto-negotiation mode, use the
following script to restore the standard method that VSC8641 uses to perform
crossover detection:
PhyWrite (PortNo, 31, 0x52B5); // Select internal register page
PhyWrite (PortNo, 16, 0xA7F8); // Request read of internal register
PhyWriteMsk (PortNo, 17, 0x0000, 0x0018); // Set for auto-negotiation
PhyWriteMsk (PortNo, 18, 0, 0); // Necessary read & re-write register 18
PhyWrite (PortNo, 16, 0x87F8); // Write-back modified internal register
PhyWrite (PortNo, 31, 0); // Select main register page
Note It is not important which order is used for writes to the SMI register with respect
to writes to Register 0, which disable and enable the auto-negotiation feature.
8.4
Default 10Base-T Settings Are Marginal and Cause
MAU Test Failure
Issue: Default 10Base-T settings are marginal for PHY silicon and magnetic module
variations.
Implications: It often causes the output 10Base-T signal to violate the IEEE waveform
templates.
Workaround: During device initialization, use the following script. For more information,
see PHY API Software and Programmers Guide, which is available on the Vitesse Web
site at www.vitesse.com.
PhyWrite (PortNo, reg_num(dec), 16_bit_unsigned_data(hex))
PhyRead (PortNo, reg_num(dec))
~ -- Logical NOT
& -- Logical AND
| -- Logical OR
= -- Assign value to variable
PhyWrite (PortNo, 31, 0x52b5); // Select internal register page
PhyWrite (PortNo, 18, 0x9e); // Necessary write of internal register
PhyWrite (PortNo, 17, 0xdd39); // Necessary write of internal register
PhyWrite (PortNo, 16, 0x87aa); // Necessary write of internal register
PhyWrite (PortNo, 16, 0xa7b4); // Necessary write of internal register
reg = PhyRead (PortNo, 18); // Read internal reg. and assign it to var.
PhyWrite (PortNo, 18, reg); // Necessary write of internal register
reg = PhyRead (PortNo, 17); // Read internal reg. and assign it to var.
reg = (reg & ~0x003f) | 0x003c;// Modify variable value
PhyWrite (PortNo, 17, reg); // Write back modified internal register
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PhyWrite (PortNo, 16, 0x87b4);
PhyWrite (PortNo, 16, 0xa794);
reg = PhyRead (PortNo, 18); //
PhyWrite (PortNo, 18, reg); //
// Necessary write
// Necessary write
Read internal reg.
Necessary write of
of internal register
of internal register
and assign it to var.
internal register
reg = PhyRead (PortNo, 17); // Read internal reg. and assign it to var.
reg = (reg & ~0x003f) | 0x003e;// Modify variable value
PhyWrite (PortNo, 17, reg); // Write back modified internal register
PhyWrite (PortNo, 16, 0x8794); // Necessary write of internal register
PhyWrite (PortNo, 18, 0xf7); // Necessary write of internal register
PhyWrite (PortNo, 17, 0xbe36); // Necessary write of internal register
PhyWrite (PortNo, 16, 0x879e); // Necessary write of internal register
PhyWrite (PortNo, 16, 0xa7a0); // Necessary write of internal register
reg = PhyRead (PortNo, 18); // Read internal reg. and assign it to var.
PhyWrite (PortNo, 18, reg); // Necessary write of internal register
reg = PhyRead (PortNo, 17); // Read internal reg. and assign it to var.
reg = (reg & ~0x003f) | 0x0034;// Modify variable value
PhyWrite (PortNo, 17, reg); // Write back modified internal register
PhyWrite (PortNo, 16, 0x87a0); // Necessary write of internal register
PhyWrite (PortNo, 18, 0x3c); // Necessary write of internal register
PhyWrite (PortNo, 17, 0xf3cf); // Necessary write of internal register
PhyWrite (PortNo, 16, 0x87a2); // Necessary write of internal register
PhyWrite (PortNo, 18, 0x3c); // Necessary write of internal register
PhyWrite (PortNo, 17, 0xf3cf); // Necessary write of internal register
PhyWrite (PortNo, 16, 0x87a4); // Necessary write of internal register
PhyWrite (PortNo, 18, 0x3c); // Necessary write of internal register
PhyWrite (PortNo, 17, 0xd287); // Necessary write of internal register
PhyWrite (PortNo, 16, 0x87a6); // Necessary write of internal register
PhyWrite (PortNo, 16, 0xa7a8); // Necessary write of internal register
reg = PhyRead (PortNo, 18); // Read internal reg. and assign it to var.
PhyWrite (PortNo, 18, reg); // Necessary write of internal register
reg = PhyRead (PortNo, 17); // Read internal reg. and assign it to var.
reg = (reg & ~0x0fff) | 0x0125;// Modify variable value
PhyWrite (PortNo, 17, reg); // Write back modified internal register
PhyWrite (PortNo, 16, 0x87a8); // Necessary write of internal register
PhyWrite (PortNo, 31, 0); // Select main register page
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8.5
On-Chip Pull-up Resistor Violation
Issue: According to the IEEE standard 802.3, the MDIO pin on a slave device should be
an open-drain pad type and drive a low value onto the MDIO shared bus. The MDIO
shared bus should be pulled high with a pull-up resistor on the PCB or SMI bus master.
The VSC8641 device includes a 100 kΩ pull-up on-chip resistor that violates this IEEE
specification.
Implication: The VSC8641 device requires an off-chip and on-chip pull-up resistor for
the interface to operate correctly. The typical value of the off-chip resistor is relatively
small at
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