DS125BR401EVM User’s Guide
User's Guide
Literature Number: SNLU121
November 2012
User's Guide
SNLU121 – November 2012
DS125BR401EVM Evaluation Kit
The DS125BR401EVM – SMA evaluation kit provides a complete high band-width platform to evaluate the
signal integrity and signal conditioning features of the Texas Instruments signal conditioning products –
with Equalization and De-emphasis. SMA edge launch connectors are used as the input and the output
connections for this evaluation board. Commercially available adaptor boards can be purchased to
facilitate connection to cables or backplane interconnects.
Topic
1
2
3
4
5
6
7
8
2
...........................................................................................................................
Page
Features ............................................................................................................. 3
4-Level IO Control ............................................................................................... 5
Switch Connection Overview ................................................................................ 6
Quick Start Guide ................................................................................................ 7
SMBus Slave Mode of the EQ, VOD, and De-Emphasis level: .................................. 10
Bill of Materials for DS125BR401EVM: ................................................................. 11
Schematic for DS125BR401EVM: ......................................................................... 12
EVM Layout ...................................................................................................... 13
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Features
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1
Features
•
•
•
•
•
•
•
•
•
•
•
4 Lane Repeater up to 12.5 Gbps
Low 65 mW/channel power consumption, with option to power down unused channels
Transparent management of link training protocol for PCIe, SAS, and 10G-KR
Receive Equalization up to 30 dB at 12.5 Gbps
Settable transmit de-emphasis driver to -12 dB
Transmit output voltage control: 700 – 1300 mV
Programmable via pin selection, EEPROM, or SMBus interface
Single supply operation: VIN = 3.3V±10% or VDD = 2.5V ±5%
-40°C to +85°C Operation
5 kV HBM ESD rating
High speed signal flow–thru pin-out package: 54-pin QFN (10 mm x 5.5 mm, 0.5 mm pitch)
Applications
FR-4 Backplane Traces and High Speed Cable
Ordering Information
EVM ID
DEVICE ID
DEVICE PACKAGE
DS125BR401EVM
DS125BR401SQE/NOPB
QFN-54
Figure 1. DS125BREVK REV. 1
DS125BR401/DS125BR800 Top Assembly
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Features
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Figure 2. DS125BREVK REV. 1
DS125BR401/DS125BR800 Bottom Assembly
4
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4-Level IO Control
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2
4-Level IO Control
Many of the control pins on the DS125BR401 have more than two valid levels. Table 1 below shows how
to access each of these levels with the switch banks on the back side of the EVM.
Table 1. Switches to set the 4-Level input control pins
4-Level Input Settings
Setting for 3 pin switches (3-2-1)
0 - Tie 1kΩ to GND
ON - OFF - OFF
R - Tie 20kΩ to GND
OFF - ON - OFF
F - FLOAT (open)
OFF - OFF - OFF
1 - Tie 1kΩ to VIH
OFF - OFF - ON
The following switches are used to set the input condition for the 4-level inputs:
• SW1, SW2, SW3, SW5, SW6, SW8, SW9
There are 3 switches connected to an input signal pin. Each switch when set to the ON position sets the
pin to one of the 4-level setting. The 6 pin switches are assigned similar to the 3 pin switches. The only
difference is 2 signal pins are connected and thus 6-5-4 is for the one signal pin and 3-2-1 is for another
signal pin.
NOTE: Only 1 switch at the ON position is allowed. Activating more than one switch concurrently
results in an indeterminate voltage level.
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Switch Connection Overview
3
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Switch Connection Overview
Table 2. Connection and Control Description
Component
Name
J1 to J8
IN_B2+,
IN_B3+,
IN_A0+,
IN_A1+,
J9 to J16
OUT_B2+,
OUT_B3+,
OUT_A0+,
OUT_A1+,
IN_B2-,
IN_B3-,
IN_A0-,
IN_A1-,
High-speed differential inputs
OUT_B2-,
OUT_B3-,
OUT_A0-,
OUT_A1-,
High-speed differential outputs
J19
VIN or VDD
DC Power - VIN or VDD to DS125BR401SQ
J20
VIN or VDD
Jumper – VIN or VDD to VIH power
J17
SDA, SCL
Optional SMBUS access pins.
See the datasheet for additional information on SMBUS.
J18
EEPROM
Optional socket for EEPROM
SW1
EQB[1:0] or
AD[3:2]
SW2
ENSMB
SW3
DEMA[1:0]
PIN MODE – DE control for channel A outputs
SW4
SDA/SCL
“ON” position connects SDA and SCL lines to the device pin.
SW5
DEMB[1:0] or
AD[1:0]
SW6
SD_TH and LPBK - RES
SW7
VDD_SEL and
RESET
SW8
EQA[1:0]
SW9
INPUT_EN and
MODE
SW10
6
Function
READ_EN
PIN MODE – EQ control for channel B inputs
SMBUS MODE – AD[3:2] device address bits
ENSMB = LOW – PIN MODE
ENSMB = HIGH – SMBUS (slave mode)
ENSMB = FLOAT – SMBUS (master mode – load configuration from
EEPROM)
PIN MODE – DE control for channel B outputs
SMBUS MODE – AD[1:0] device address bits
SD_TH – Signal detect threshold level (FLOAT = Default level)
LPBK function for BR401 only (FLOAT = Normal operation)
VDD_SEL – Enable or disable the internal 3.3V to 2.5V regulator.
RESET – Enable or disable the device (LOW – enable)
PIN MODE – EQ control for channel A inputs
INPUT_EN – Enable or disable the internal 50 ohm to VDD terminations
MODE – Tie 1kΩ to GND = GEN 1,2 and SAS 1,2
Float = Auto Mode Select (for PCIe and SAS-3)
Tie 20kΩ to GND = SAS-3 and GEN-3 without De-emphasis
Tie 1kΩ to VDD = SAS-3 and GEN-3 with De-emphasis
ENSMB = FLOAT – SMBUS (master mode – load configuration from
EEPROM)
SW6: SD_TH becomes the READ_EN pin.
To start the loading at power up, set SW6 pin 3 to “ON” position (pull to
GND).
To manually control the start, set SW6 pin 1 to “ON” position (pull to VDD)
and push the SW10 button for the high to low transition to start the loading.
When the loading is complete the LED – D1 light should turn OFF.
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Quick Start Guide
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Quick Start Guide
1. Connect J19: VIN = 3.3V or VDD = 2.5V and GND.
• For VIN = 3.3V:
Set SW7 pin1 (VDD_SEL) to the ON position (enable internal LDO regulator) and float VDD at J19.
• For VIN = 2.5V:
Set SW7 pin1 (VDD_SEL) to the OFF positions (disable internal LDO regulator) and float VIN at
J19.
2. Set jumper – J20 for VIH connection to VIN or VDD.
3. Connect 50 Ohm SMA cables to the board.
• The input signals J5 to J12 can be connected from a pattern generator.Set SW7 pin1 (VDD_SEL)
to the ON position (enable internal LDO regulator) and float VDD at J19.
• The output signals J1 to J4 and J13 to J16 can be connected to a scope.
Table 3. SMA Channel Connections
A/B Channels
B-Channels
A-Channels
Input Channel
Output Channel
J1 – OUT_B2+, J2 – OUT_B2-
J9 – IN_B2+, J10 – IN_B2-
J3 – OUT_B3+, J4 – OUT_B3-
J11 – IN_B3+, J12 – IN_B3-
J5 – IN_A0+, J6 – IN_A0-
J13 – OUT_A0+, J14 – OUT_A0-
J7 – IN_A1+, J8 – IN_A1-
J15 – OUT_A1+, J16 – OUT_A1-
4. Set the control pins for normal operation
• SW7 – RESET = 0 (enables the device): set switch pin2 to the ON position.
• SW9 – INPUT_EN = 1 (50 ohm input termination): set switches (3-2-1) = (OFF-OFF-ON).
• SW9 – MODE = VDD (enables SAS-3 / PCIe GEN3 mode): set switches (6-5-4) = (OFF-OFF-ON).
• SW6 – SD_TH = F (default signal detect threshold level): set switches (3-2-1) = (OFF-OFF-OFF).
• SW6 – LPBK - RES = F (normal operation): set switches (6-5-4) = (OFF-OFF-OFF).
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Quick Start Guide
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5. Set the input equalization level.
• For external pin mode control of the equalization level:
• Set ENSMB = 0 (1kΩ to GND) by using the SW2 (3-2-1) = (ON-OFF-OFF).
• SW4 pin1,2 must be set to the OFF positions, so the SMBUS signals are disconnected.
• Refer to Table 1 for information on the 3 switch settings for the 4 level input.
Example:
• Set EQB[1:0] with SW1 for the B bank of inputs (top 4 inputs of DS125BR401).
• SW1 (6-5-4), (3-2-1) = (OFF-ON-OFF), (OFF-ON-OFF) = EQB[1:0] = R,R (Level 6).
• Set EQA[1:0] with SW8 for the A bank of inputs (bottom 4 inputs of DS125BR401).
• SW8 (6-5-4), (3-2-1) = (OFF-ON-OFF), (OFF-ON-OFF) = EQA[1:0] = R,R (Level 6).
Table 4. EQ Settings available with PIN MODE
Level
8
EQA/B[1:0]
SW1 - EQB[1:0] or SW8 - EQA[1:0]
6
5
4
EQ (dB) @ 6 GHz
3
2
1
1
0, 0
ON
OFF
OFF
ON
OFF
OFF
3.1
2
0, R
ON
OFF
OFF
OFF
ON
OFF
6.7
3
0, F
ON
OFF
OFF
OFF
OFF
OFF
8.4
4
0, 1
ON
OFF
OFF
OFF
OFF
ON
9.1
5
R, 0
OFF
ON
OFF
ON
OFF
OFF
13.7
6
R, R
OFF
ON
OFF
OFF
ON
OFF
16.2
7
R, F
OFF
ON
OFF
OFF
OFF
OFF
15.9
8
R, 1
OFF
ON
OFF
OFF
OFF
ON
17.0
9
F, 0
OFF
OFF
OFF
ON
OFF
OFF
20.7
10
F, R
OFF
OFF
OFF
OFF
ON
OFF
21.8
11
F, F
OFF
OFF
OFF
OFF
OFF
OFF
23.6
12
F, 1
OFF
OFF
OFF
OFF
OFF
ON
24.7
13
1, 0
OFF
OFF
ON
ON
OFF
OFF
28.0
14
1, R
OFF
OFF
ON
OFF
ON
OFF
29.2
15
1, F
OFF
OFF
ON
OFF
OFF
OFF
30.9
16
1, 1
OFF
OFF
ON
OFF
OFF
ON
31.9
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Quick Start Guide
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6. Set the output VOD and De-emphasis level.
• For external pin mode control for the VOD and De-emphasis level:
• Set ENSMB = 0 (1kΩ to GND) by using the SW2 (3-2-1) = (ON-OFF-OFF).
• SW4 pin1,2 must be set to the OFF positions, so the SMBUS signals are disconnected.
• Refer to Table 1 for information on the 3 switch settings for the 4 level input.
Example:
• Set DEMB[1:0] with SW5 for the B bank of outputs (top 4 outputs of DS125BR401).
• SW5 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMB[1:0] = 0,1 (VOD=1.0V, DE=0 dB).
• Set DEMA[1:0] with SW3 for the A bank of outputs (bottom 4 outputs of DS125BR401).
• SW3 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMA1:0] = 0,1 (VOD=1.0V, DE=0 dB).
Table 5. DE and VOD Settings available in PIN MODE
Level
EQA/B[1:0]
SW1 - EQB[1:0] or SW8 - EQA[1:0]
6
5
4
GEN1 and GEN2
3
2
1
Inner Amplitude
(VPP)
DE (dB)
0
1
0, 0
ON
OFF
OFF
ON
OFF
OFF
0.8
2
0, R
ON
OFF
OFF
OFF
ON
OFF
0.9
0
3
0, F
ON
OFF
OFF
OFF
OFF
OFF
0.6
-3.5
4
0, 1
ON
OFF
OFF
OFF
OFF
ON
1.0
0
5
R, 0
OFF
ON
OFF
ON
OFF
OFF
0.7
-3.5
6
R, R
OFF
ON
OFF
OFF
ON
OFF
0.5
-6
7
R, F
OFF
ON
OFF
OFF
OFF
OFF
1.1
0
8
R, 1
OFF
ON
OFF
OFF
OFF
ON
0.7
-3.5
9
F, 0
OFF
OFF
OFF
ON
OFF
OFF
0.6
-6
10
F, R
OFF
OFF
OFF
OFF
ON
OFF
1.2
0
11
F, F
OFF
OFF
OFF
OFF
OFF
OFF
0.8
-3.5
12
F, 1
OFF
OFF
OFF
OFF
OFF
ON
0.6
-6
13
1, 0
OFF
OFF
ON
ON
OFF
OFF
1.3
0
14
1, R
OFF
OFF
ON
OFF
ON
OFF
0.9
-3.5
15
1, F
OFF
OFF
ON
OFF
OFF
OFF
0.7
-6
16
1, 1
OFF
OFF
ON
OFF
OFF
ON
0.5
-9
NOTE: The De-Emphasis levels are also available in SAS-3 / GEN-3 mode when MODE = 1
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SMBus Slave Mode of the EQ, VOD, and De-Emphasis level:
5
SMBus Slave Mode of the EQ, VOD, and De-Emphasis level:
•
•
•
•
•
10
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Set ENSMB = 1 (1kΩ to VIH) by using the SW2 (3-2-1) = (OFF-OFF-ON).
Set SW4 pin1,2 to the ON position so the SMBUS signals are connected.
Set SW3 pin1 thru pin6 switches to the OFF position so they do not connect to the SDA and SCL line.
Set the SW1 and SW5 for the AD[3:0] pins. AD[3:0]=0000 sets device slave address = B0’hex.
Connect SDA, SCL and GND to J17. Please refer to datasheet for register map for EQ, VOD and
DEM.
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Bill of Materials for DS125BR401EVM:
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Bill of Materials for DS125BR401EVM:
Table 6. DS125BR401EVM BOM
Item
Qty
1
1
C1
445-3448-1-ND
C1608Y5V0J106Z
CAP CER 10UF 6.3V Y5V 0603
2
1
C2
445-1322-1-ND
C1608X5R0J105K
CAP CER 1.0UF 6.3V X5R 0603
5
C3, C4, C5, C6,
C7
445-4711-1-ND
C0603X5R0J104M
CAP CER .10UF 6.3V X5R 0201
4
16
C11,
C14,
C17,
C20,
C23,
C26
587-2483-1-ND
LMK063BJ224MP-F
CAP CER .22UF 10V X5R 0201
5
1
D1
511-1592-1-ND
SML-P12PTT86
6
16
J1, J2, J3, J4, J5,
J6, J7, J8, J9,
J10, J11, J12,
J13, J14, J15,
J16
J801-ND
142-0761-881
CONN JACK SMA 50 OHMS PC MOUNT
7
1
J17
WM6504-ND
22-28-4043
CONN HEADER 4POS .100 VERT GOLD
8
2
J19, J20
WM6503-ND
22-28-4033
CONN HEADER 3POS .100 VERT GOLD
9
1
J18
3M5473-ND
4808-3004-CP
10
31
R1, R2, R3, R4,
R8, R11, R13,
R14, R16, R17,
R19, R20, R22,
R23, R25, R26,
R28, R29, R31,
R32, R34, R35,
R37, R38, R40,
R41, R43, R44,
R46, R47, R49
P1.00KLCT-ND
ERJ-2RKF1001X
RES 1.00K 1/10W 1% 0402
11
1
R7
P220LCT-ND
ERJ-2RKF2200X
RES 220 1/10W 1% 0402
12
13
R12,
R21,
R30,
R39,
R48
P20.0KLCT-ND
ERJ-2RKF2002X
RES 20.0K 1/10W 1% 0402
13
2
R5, R6
P4.70KLCT-ND
ERJ-2RKF4701X
RES 4.70K OHM 1/10W 1% 0402 SMD
14
6
SW1, SW3, SW5,
SW6, SW8, SW9
CT2196MST-ND
219-6MST
SWITCH TAPE SEAL 6 POS SMD
15
1
SW2
CT2193MST-ND
219-3MST
SWITCH TAPE SEAL 3 POS SMD
16
2
SW4, SW7
CT2192MST-ND
219-2MST
SWITCH TAPE SEAL 2 POS SMD
17
1
SW10
P12225SCT-ND
EVQ-21505R
18
1
U1
3
Reference
C12,
C15,
C18,
C21,
C24,
R15,
R24,
R33,
R42,
C13,
C16,
C19,
C22,
C25,
R18,
R27,
R36,
R45,
Digikey PN
NA
Manufacture PN
Descriptions
LED GRN 0.2MM 13MCD 0402 SMD
SOCKET IC 8-POS .3"
SWITCH LT 6MM 160GF 5MM HEIGHT
DS125BR401SQ/NOPB BUFFER - REPEATER
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Schematic for DS125BR401EVM:
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Schematic for DS125BR401EVM:
Figure 3. DS125BR401EVM Schematic
Note: The DS125BR401 and DS125BR800 share a common EVM PCB Assembly.
12
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EVM Layout
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EVM Layout
The following Figures show the DS125BR401EVM board layout. The EVM controls signal integrity
functions via a combination of switches and jumpers.
The DS125BR401 is very compact and low power. The QFN package offers an exposed thermal pad to
enhance electrical and thermal performance. This must be soldered to the copper landing on the PWB.
Figure 4. Top Assembly Layer
Figure 5. Bottom Assembly Layer
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