CP2200

CP2200/1 SINGLE-CHIP ETHERNET CONTROLLER Ethernet Controller Integrated IEEE 802.3 MAC and 10 BASE-T PHY Fully compatible with 100/1000 BASE-T networks Full/Half duplex with auto-negotiation Automatic polarity detection and correction Automatic retransmission on collision Automatic padding and CRC generation Supports broadcast and multi-cast MAC addressing Software Support Royalty-free TCP/IP stack with device drivers TCP/IP Stack Configuration Wizard Hardware diagnostic software and example code Example Applications Remote sensing and monitoring Inventory management VoIP phone adapters Point-of-sale devices Network clocks Embedded Web Server Remote Ethernet-to-UART bridge Parallel Host Interface (30 Mbps Transfer Rate) 8-bit multiplexed or non-multiplexed mode Only 11 I/O pins required in multiplexed mode Intel® or Motorola® Bus Format Interrupt on received packets and Wake-on-LAN Supply Voltage 3.1 to 3.6 V 8 kB Flash Memory 8192 bytes ISP non-volatile memory Factory pre-programmed unique 48-bit MAC Address No external EEPROM required Package Pb-free 48-pin TQFP (9x9 mm footprint) Pb-free 28-pin QFN (5x5 mm footprint) Other Features LED output drivers (Link/Activity) Dedicated 2 kB RAM transmit buffer and 4 kB RAM receive FIFO buffer Power-on Reset 5 V Tolerant I/O Ordering Part Number CP2200-GQ (48-pin) CP2201-GM (28-pin) Temperature Range: –40 to +85 °C 20 MHz XTAL CP2200 LED Control 8 kB Flash Clock Parallel Bus Host Interface 2 kB Tx Buffer Ethernet MAC 4 kB Rx FIFO Ethernet PHY ACT LED TX+/TX- RJ-45 RX+/RXLINK LED Figure 1. Example System Diagram Rev. 1.0 5/07 Copyright © 2007 by Silicon Laboratories CP2200/1 C P2200/1 2 Rev. 1.0 C P2200/1 TABLE OF CONTENTS Section Page 1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 2. Typical Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 3. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 4. Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 5. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.2. Reset Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 6.3. Interrupt Request Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.4. Clocking Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.5. LED Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 6.6. Sending and Receiving Packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7. Internal Memory and Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.1. Random Access to RAM Transmit and Receive Buffers . . . . . . . . . . . . . . . . . . . . . . 23 7.2. Internal Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8. Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30 9. Reset Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 9.1. Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 9.2. Power-fail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 9.3. Oscillator-Fail Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 9.4. External Pin Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 9.5. Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 9.6. Determining the Source of the Last Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 9.7. De-Selecting Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 10. Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 10.1. Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.2. Link Detection Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.3. Memory Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.4. Shutdown Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.5. Disabling Secondary Device Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 11. Transmit Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 11.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 11.2. Transmitting a Packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 11.3. Overriding Transmit Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 11.4. Transmit Buffer and AutoWrite Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 11.5. Transmit Status and Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 12. Receive Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 12.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 12.2. Reading a Packet Using the Autoread Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 12.3. Timing and Buffer Overflow Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 12.4. Initializing the Receive Buffer, Filter and Hash Table . . . . . . . . . . . . . . . . . . . . . . . 59 Rev. 1.0 3 C P2200/1 12.5. Receive Status and Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 12.6. Advanced Receive Buffer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 12.7. Receive Buffer Advanced Status and Control Registers . . . . . . . . . . . . . . . . . . . . .67 13. Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 13.1. Programming the Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 13.2. Reading the Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 13.3. Flash Access Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 14. Media Access Controller (MAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 14.1. Initializing the MAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78 14.2. Accessing the Indirect MAC Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 14.3. Indirect MAC Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 15. Physical Layer (PHY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 15.1. Auto-Negotiation and Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 15.2. Auto-Negotiation Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 15.3. Loopback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 15.4. Link Integrity Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 15.5. Receiver Smart Squelch and Automatic Polarity Correction . . . . . . . . . . . . . . . . . . 89 15.6. Transmitter Jabber Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89 15.7. Initializing the Physical Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 16. Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96 16.1. Non-Multiplexed Intel Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 16.2. Multiplexed Intel Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98 16.3. Non-Multiplexed Motorola Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 16.4. Multiplexed Motorola Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108 4 Rev. 1.0 C P2200/1 1. System Overview The CP2200/1 is a single-chip Ethernet controller containing an integrated IEEE 802.3 Ethernet Media Access Controller (MAC), 10BASE-T Physical Layer (PHY), and 8 kB Non-Volatile Flash Memory available in a compact 5 x 5 mm QFN-28 package (sometimes called “MLF” or “MLP”) and a 48-pin TQFP package. The CP2200/1 can add Ethernet connectivity to any microcontroller or host processor with 11 or more Port I/O pins. The 8-bit parallel interface bus supports both Intel and Motorola bus formats in multiplexed and non-multiplexed mode. The data transfer rate in non-multiplexed mode can exceed 30 Mbps. The on-chip Flash memory may be used to store user constants, web server content, or as general purpose nonvolatile memory. The Flash is factory preprogrammed with a unique 48-bit MAC address stored in the last six memory locations. Having a unique MAC address stored in the CP2200/1 often removes the serialization step from the product manufacturing process of most embedded systems. The CP2200/1 has four power modes with varying levels of functionality that allow the host processor to manage the overall system power consumption. The optional interrupt pin also allows the host to enter a “sleep” mode and awaken when a packet is received or when the CP2200/1 is plugged into a network. Auto-negotiation allows the device to automatically detect the most efficient duplex mode (half/full duplex) supported by the network. The Ethernet Development Kit (Ethernet-DK) bundles a C8051F120 MCU Target Board, CP2200 Ethernet Development Board (AB4), the Silicon Laboratories IDE, all necessary debug hardware, and a TCP/IP Configuration Wizard. The Ethernet Development Kit includes all hardware, software, and examples necessary to design an embedded system using the CP2200. The CP2200 Ethernet Development Board is also compatible with the C8051F020TB and C8051F340TB. Individual target boards may be purchased online by visiting www.silabs.com. Rev. 1.0 5 C P2200/1 2. Typical Connection Diagram Figure 2 and Figure 3 show typical connection diagrams for the 48-pin CP2200 and 28-pin CP2201. +3VD 0.1 uF 0.1 uF 0.1 uF 10 uF +3VD AV+ VDD1 VDD2 4.7 kΩ 20 MHz 22 pF 10 MΩ 22 pF XTAL1 XTAL2 RST MUXEN MOTEN Integrated RJ-45 Jack MCU A15 A[7:0] D[7:0] RD WR Optional CP2200 CS A[7:0] D[7:0] RD WR 8 8 LINK ACT ACT LINK 8Ω TX+ 0.001 uF 0.001 uF TXP 1:2.5 RJ-45 1 TX– 8Ω 0.1 uF TXN TCT RXP RXN RCT 1:1 2 3 4 5 6 7 8 INT Optional INT DGND1 DGND2 RX+ RX– 0.1 uF 100 Ω GND AGND Chassis Ground Note: The CP220x should be placed within 1 inch of the transformer for optimal performance. Figure 2. Typical Connection Diagram (Non-Multiplexed) 6 Rev. 1.0 C P2200/1 +3VD 0.1 uF 0.1 uF 0.1 uF 10 uF +3VD AV+ VDD1 VDD2 4.7 kΩ 20 MHz 22 pF 10 MΩ 22 pF XTAL1 XTAL2 RST MOTEN MCU 8 CS CP2201 LA LINK/ACTIVITY AD[7:0] AD[7:0] TX+ 8Ω 0.001 uF 0.001 uF Integrated RJ-45 Jack TXP 1:2.5 RD WR ALE INT Optional RD WR ALE INT RJ-45 1 TX– 8Ω 0.1 uF TXN TCT RXP RXN RCT 1:1 2 3 4 5 6 7 8 RX+ DGND1 DGND2 GND AGND 0.1 uF 100 Ω RX– Chassis Ground Note: The CP220x should be placed within 1 inch of the transformer for optimal performance. Figure 3. Typical Connection Diagram (Multiplexed) Rev. 1.0 7 C P2200/1 3. Absolute Maximum Ratings Table 1. Absolute Maximum Ratings Parameter Ambient temperature under bias Storage Temperature Voltage on any I/O Pin or RST with respect to GND Voltage on VDD with respect to GND Maximum Total current through VDD and GND Maximum output current sunk by RST or any I/O pin Conditions Min –55 –65 –0.3 –0.3 — — Typ — — — — — — Max 125 150 5.8 4.2 500 100 Units °C °C V V mA mA Note: Stresses above those listed may cause permanent damage to the device. This is a stress rating only, and functional operation of the devices at or exceeding the conditions in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. 8 Rev. 1.0 C P2200/1 4. Electrical Characteristics Table 2. Global DC Electrical Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameter Supply Voltage Supply Current in Normal Mode (Transmitting) Supply Current in Normal Mode (No Network Traffic) Supply Current with Transmitter and Receiver Disabled (Memory Mode) Supply Current in Reset Supply Current in Shutdown Mode Specified Operating Temperature Range Conditions Min 3.1 Typ 3.3 75 60 47 15 6.5 — Max 3.6 155 — — — — +85 Units V mA mA mA mA mA °C VDD = 3.3 V VDD = 3.3 V VDD = 3.3 V VDD = 3.3 V VDD = 3.3 V — — — — — –40 Table 3. Digital I/O DC Electrical Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameters Output High Voltage (VOH) Conditions IOH = –3 mA IOH = –10 µA IOH = –10 mA IOL = 8.5 mA IOL = 10 µA IOL = 25 mA Min VDD – 0.7 VDD – 0.1 — — — — 2.0 — — Typ — — VDD – 0.8 — — 1.0 — — 25 Max — — — 0.6 0.1 — — 0.8 50 UNITS V Output Low Voltage (VOL) V Input High Voltage (VIH) Input Low Voltage (VIL) Input Leakage Current V V µA Rev. 1.0 9 C P2200/1 5. Pinout and Package Definitions Table 4. CP2200/1 Pin Definitions Name Pin Numbers 48-pin AV+ AGND VDD1 DGND1 VDD2 DGND2 RST 5 4 13 14 30 31 15 28-pin 3 2 8 9 19 20 10 D I/O Power In 3.1–3.6 V Analog Power Supply Voltage Input. Analog Ground Power In 3.1–3.6 V Digital Power Supply Voltage Input. Digital Ground Power In 3.1–3.6 V Digital Power Supply Voltage Input. Digital Ground Device Reset. Open-drain output of internal POR and VDD monitor. An external source can initiate a system reset by driving this pin low for at least 15 µs. Link LED. Push-pull output driven high when valid 10BASE-T link pulses are detected (Link Good) and driven low when valid 10BASE-T link pulses are not detected (Link Fail). Activity LED. Push-pull output driven high for 50 ms when any packet is transmitted or received and driven low all other times. Link or Activity LED. Push-pull output driven high when valid link pulses are detected (Link Good) and driven low otherwise (Link Fail). The output is toggled for each packet transmitted or received, then returns to its original state after 50 ms. Crystal Input. This pin is the return for the external oscillator driver. This pin can be overdriven by an external CMOS clock. Crystal Output. This pin is the excitation driver for a quartz crystal. 10BASE-T Transmit, Differential Output (Positive). 10BASE-T Transmit, Differential Output (Negative). 10BASE-T Receive, Differential Input (Positive). 10BASE-T Receive, Differential Input (Negative). Motorola Bus Format Enable. This pin should be tied directly to VDD for Motorola bus format or directly to GND for Intel bus format. Multiplexed Bus Enable. This pin should be tied directly to VDD for multiplexed bus mode or directly to GND for non-multiplexed bus mode. Interrupt Service Request. This pin provides notification to the host. Type Description LINK 3* — D Out ACT LA 2* — — 1* D Out D Out XTAL1 XTAL2 TX+ TX– RX+ RX– MOTEN MUXEN 46 45* 9 10 7 6 43 44 28 27* 6 7 5 4 26 — A In A Out A Out A Out A In A In D In D In INT 42 25 D Out *Note: Pins can be left unconnected when not used. 10 Rev. 1.0 C P2200/1 Table 4. CP2200/1 Pin Definitions (Continued) Name Pin Numbers 48-pin CS RD/(DS) WR/(R/W) D0/AD0 D1/AD1 D2/AD2 D3/AD3 D4/AD4 D5/AD5 D6/AD6 D7/AD7 A0 A1 A2 A3/ALE/(AS) 41 39 40 16 17 18 19 20 21 22 23 27* 28* 29* 32 28-pin 24 22 23 11 12 13 14 15 16 17 18 — — — — D In D In D In D I/O D I/O D I/O D I/O D I/O D I/O D I/O D I/O D In D In D In D In Device Chip Select. Read Strobe (Intel Mode) or Data Strobe (Motorola Mode) Write Strobe (Intel Mode) or Read/Write Strobe (Motorola Mode) Bit 0, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 1, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 2, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 3, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 4, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 5, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 6, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 7, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus Bit 0, Non-Multiplexed Address Bus Bit 1, Non-Multiplexed Address Bus Bit 2, Non-Multiplexed Address Bus Bit 3, Non-Multiplexed Address Bus ALE Strobe (Multiplexed Intel Mode) Address Strobe (Multiplexed Motorola Mode) ALE Strobe (Intel Mode) Address Strobe (Motorola Mode) Bit 4, Parallel Interface Non-Multiplexed Address Bus Bit 5, Parallel Interface Non-Multiplexed Address Bus Bit 6, Parallel Interface Non-Multiplexed Address Bus Bit 7, Parallel Interface Non-Multiplexed Address Bus These pins should be left unconnected or tied to VDD. Type Description ALE/(AS) A4 A5 A6 A7 NC — 33* 34* 37* 38* 1, 8, 11,12 24–26 35,36 47, 48 21 — — — — — D In D In D In D In D In *Note: Pins can be left unconnected when not used. Rev. 1.0 11 C P2200/1 WR/(R/W) XTAL1 XTAL2 RD/(DS) MOTEN MUXEN INT NC NC CS A7 38 48 47 46 45 44 43 42 41 40 39 NC ACT LINK AGND AV+ RXRX+ NC TX+ TXNC NC 37 A6 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 NC NC A5 A4 A3/ALE/(AS) DGND2 VDD2 A2 A1 A0 NC NC CP2200 Top View 31 30 29 28 27 26 25 13 14 15 16 17 18 19 20 21 22 23 DGND1 D1/AD1 D2/AD2 D5/AD5 D6/AD6 D3/AD3 D7/AD7 VDD1 RST Figure 4. 48-pin TQFP Pinout Diagram 12 D0/AD0 Rev. 1.0 D4/AD4 NC 24 C P2200/1 D D1 Table 5. TQFP-48 Package Dimensions A A1 A2 b D D1 E e E1 Min — 0.05 0.95 0.17 — — — — — MM Typ — — 1.00 0.22 9.00 7.00 9.00 0.50 7.00 Max 1.20 0.15 1.05 0.27 — — — — — E1 E 48 PIN 1 IDENTIFIER A2 1 e A A1 b Figure 5. 48-pin TQFP Package Dimensions Rev. 1.0 13 C P2200/1 WR/(R/W) 23 RD/(DS) 22 MOTEN XTAL1 XTAL2 INT 25 28 27 26 GND LA AGND AV+ RXRX+ TX+ TX1 2 3 4 5 6 24 CS 21 20 19 ALE/(AS) DGND2 VDD2 AD7 AD6 AD5 AD4 CP2201 Top View 18 17 16 GND 7 15 10 11 12 13 AD2 RST AD0 AD1 Figure 6. QFN-28 Pinout Diagram (Top View) 14 DGND1 VDD1 Rev. 1.0 AD3 14 8 9 C P2200/1 Bottom View L 7 Table 6. QFN-28 Package Dimensions 15 10 12 13 11 14 8 9 6 5 4 e D2 2 b D2 16 17 R 18 19 20 6xe E E2 2 1 DETAIL 1 28 27 26 25 24 23 22 E2 2 3 21 6xe D Side View A2 A A A1 A2 A3 b D D2 E E2 e L N ND NE R AA BB CC DD Min 0.80 0 0 — 0.18 — 2.90 — 2.90 — 0.45 — — — 0.09 — — — — MM Typ 0.90 0.02 0.65 0.25 0.23 5.00 3.15 5.00 3.15 0.5 0.55 28 7 7 — 0.435 0.435 0.18 0.18 Max 1.00 0.05 1.00 — 0.30 — 3.35 — 3.35 — 0.65 — — — — — — — — A3 DETAIL 1 AA BB Figure 7. QFN-28 Package Drawing DD CC Rev. 1.0 A1 e 15 C P2200/1 Top View 0.50 mm 0.20 mm 0.20 mm 0.30 mm 0.85 mm 0.50 mm D2 0.35 mm 0.50 mm 0.20 mm Optional GND Connection b 0.10 mm L E2 0.20 mm 0.30 mm e 0.50 mm 0.10 mm 0.35 mm 0.85 mm E Figure 8. Typical QFN-28 Landing Diagram 16 Rev. 1.0 D C P2200/1 Top View 0.50 mm 0.20 mm 0.20 mm 0.30 mm 0.85 mm 0.50 mm 0.60 mm 0.60 mm 0.70 mm 0.30 mm 0.20 mm 0.40 mm D2 0.35 mm 0.50 mm 0.20 mm b 0.10 mm L e E2 0.20 mm 0.30 mm 0.50 mm 0.10 mm 0.35 mm 0.85 mm E Figure 9. Typical QFN-28 Solder Paste Diagram Rev. 1.0 D 17 C P2200/1 6. Functional Description 6.1. Overview In most systems, the CP2200/1 is used for transmitting and receiving Ethernet packets, non-volatile data storage, and controlling Link and Activity LEDs. The device is controlled using direct and indirect internal registers accessible through the parallel host interface. All digital pins on the device are 5 V tolerant. 6.2. Reset Initialization After every CP2200/1 reset, the following initialization procedure is recommended to ensure proper device operation: Step 1: Wait for the reset pin to rise. This step takes the longest during a power-on reset. Step 2: Wait for Oscillator Initialization to complete. The host processor will receive notification through the interrupt request signal once the oscillator has stabilized. Step 3: Wait for Self Initialization to complete. The INT0 interrupt status register on page 31 should be checked to determine when Self Initialization completes. Step 4: Disable interrupts (using INT0EN and INT1EN on page 33 and page 36) for events that will not be monitored or handled by the host processor. By default, all interrupts are enabled after every reset. Step 5: Initialize the physical layer. See “15.7. Initializing the Physical Layer” on page 90 for a detailed physical layer initialization procedure. Step 6: Enable the desired Activity, Link, or Activity/Link LEDs using the IOPWR register on page 45. Step 7: Initialize the media access controller (MAC). See “14.1. Initializing the MAC” on page 78 for a detailed MAC initialization procedure. Step 8: Configure the receive filter. See “12.4. Initializing the Receive Buffer, Filter and Hash Table” on page 59 for a detailed initialization procedure. Step 9: The CP2200/1 is ready to transmit and receive packets. 6.3. Interrupt Request Signal The CP2200/1 has an interrupt request signal (INT) that can be used to notify the host processor of pending interrupts. The INT signal is asserted upon detection of any enabled interrupt event. Host processors that cannot dedicate a port pin to the INT signal can periodically poll the interrupt status registers to see if any interrupt generating events have occurred. If the /INT signal is not used, pending interrupts such a Receive FIFO Full must still be serviced. The 14 interrupt sources are listed below. Interrupts are enabled on reset and can be disabled by software. Pending interrupts can be cleared (allowing the INT signal to de-assert) by reading the self-clearing interrupt registers. See “8. Interrupt Sources” on page 30 for a complete description of the CP2200/1 interrupts. End of Packet Reached Receive FIFO Empty Receive FIFO Full Oscillator Initialization Complete Self Initialization Complete Flash Write/Erase Complete Packet Transmitted Packet Received “Wake-on-LAN” Wakeup Event Link Status Changed Jabber Detected Auto-Negotiation Failed Remote Fault Notification Auto-Negotiation Complete 18 Rev. 1.0 C P2200/1 6.4. Clocking Options The CP2200/1 can be clocked from an external parallel-mode crystal oscillator or CMOS clock. Figure 10 and Figure 11 show typical connections for both clock source types. If a crystal oscillator is chosen to clock the device, the crystal is started once the device is released from reset and remains on until the device reenters the reset state or loses power. XTAL1 20 MHz 10 M Ω XTAL2 Figure 10. Crystal Oscillator Example Important note on external crystals: Crystal oscillator circuits are quite sensitive to PCB layout. The crystal should be placed as close as possible to the XTAL pins on the device. The traces should be as short as possible and shielded with a ground plane from any other traces that could introduce noise or interference. 20 MHz CMOS Clock XTAL1 XTAL2 No Connect Figure 11. External CMOS Clock Example Table 7 lists the clocking requirements of the CP2200/1 when using a crystal oscillator or CMOS clock. Table 8 shows the electrical characteristics of the XTAL1 pin. These characteristics are useful when selecting an external CMOS clock. Rev. 1.0 19 C P2200/1 Table 7. Clocking Requirements VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameters Frequency Frequency Error Duty Cycle Conditions Min — — 45 Typ 20 — 50 Max — UNITS MHz ppm % ±50 55 Table 8. Input Clock Pin (XTAL1) DC Electrical Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameters XTAL1 Input Low Voltage XTAL1 Input High Voltage Conditions Min — 2.0 Typ — — Max 0.7 — UNITS V V 20 Rev. 1.0 C P2200/1 6.5. LED Control The CP2200/1 can be used to control link status and activity LEDs. The CP2200 (48-pin TQFP) has two push-pull LED drivers that can source up to 10 mA each. The CP2201 (28-pin QFN) has a single push-pull LED driver that turns the LED on or off based on the link status and blinks the LED when activity is detected on a good link. Table 9 shows the function of the LED signals available on the CP2200/1. Table 9. LED Control Signals Signal LINK ACT LA Device CP2200 CP2200 CP2201 Description Asserted when valid link pulses are detected. Asserted for 50 ms for each packet transmitted or received. Asserted when valid link pulses are detected and toggled for 50 ms for each packet transmitted or received. Figure 12 shows a typical LED connection for the CP2200. The CP2201 uses an identical connection for the LA (link/activity) pin. The LED drivers are enabled and disabled using the IOPWR register on page 45. LINK ACT Figure 12. LED Control Example (CP2200) Rev. 1.0 21 C P2200/1 6.6. Sending and Receiving Packets After reset initialization is complete, the CP2200/1 is ready to send and receive packets. Packets are sent by loading data into the transmit buffer using the AutoWrite register and writing ‘1’ to TXGO. See “11.2. Transmitting a Packet” on page 48 for detailed information on how to transmit a packet using the transmit interface. A Packet Transmitted interrupt will be generated once transmission is complete. Packet reception occurs automatically when reception is enabled in the MAC and the receive buffer is not full. Once a packet is received, the host processor is notified by generating a Packet Received interrupt. The host may read the packet using the AutoRead interface. See “12.2. Reading a Packet Using the Autoread Interface” on page 58 and “12.4. Initializing the Receive Buffer, Filter and Hash Table” on page 59 for additional information on using and initializing the receive interface. 22 Rev. 1.0 C P2200/1 7. Internal Memory and Registers The CP2200/1 is controlled through direct and indirect registers accessible through the parallel host interface. The host interface provides an 8-bit address space, of which there are 114 valid direct register locations (see Table 11 on page 25). All remaining addresses in the memory space are reserved and should not be read or written. The direct registers provide access to the RAM buffers, Flash memory, indirect MAC configuration registers, and other status and control registers for various device functions. Figure 13 shows the RAM and Flash memory organization. The transmit and receive RAM buffers share the same address space and are both accessed using the RAMADDRH:RAMADDRL pointer. Each of the buffers has a dedicated data register. The Flash memory has a separate address space and a dedicated address pointer and data register. See “13. Flash Memory” on page 73 for detailed information on how to read and write to Flash. Transmit Buffer (2K) 0x0000 – 0x07FF Receive Buffer (4K) 0x0000 – 0x0FFF Flash Memory (8K) 0x0000 – 0x1FFF RAMADDRH:RAMADDRL FLASHADDRH:FLASHADDRL Figure 13. RAM Buffers and Flash Memory Organization 7.1. Random Access to RAM Transmit and Receive Buffers The most common and most efficient methods for accessing the transmit and receive buffers are the AutoWrite and AutoRead interfaces. These interfaces allow entire packets to be written or read at a time. In very few cases, the transmit and receive buffers may need to be accessed randomly. An example of this is a system in which a specific byte in the packet is checked to determine whether to read the packet or discard it. The following procedure can be used to read or write data to either RAM buffer: Step 1: Write the address of the target byte to RAMADDRH:RAMADDRL. Step 2: Transmit Buffer: Read or write 8-bit data to RAMTXDATA to read or write from the target byte in the transmit buffer. Receive Buffer: Read or write 8-bit data to RAMRXDATA to read or write from the target byte in the receive buffer. Note: Reads and writes of the RAM buffers using the random access method are independent of the AutoRead and AutoWrite interfaces. Each of the interfaces has a dedicated set of address and data registers. See “11.2. Transmitting a Packet” on page 48 and “12.2. Reading a Packet Using the Autoread Interface” on page 58 for additional information about the AutoRead and AutoWrite interfaces. Rev. 1.0 23 C P2200/1 Register 1. RAMADDRH: RAM Address Pointer High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x08 Bits7–0: RAMADDRH: RAM Address Register High Byte Holds the most significant eight bits of the target RAM address. Register 2. RAMADDRL: RAM Address Pointer Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x09 Bits7–0: RAMADDRL: RAM Address Register Low Byte Holds the least significant eight bits of the target RAM address. Register 3. RAMTXDATA: RAM Transmit Buffer Data Register R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x04 Bits7–0: RAMTXDATA: Transmit Buffer Data Register Read: Returns data in the transmit buffer at location RAMADDRH:RAMADDRL. Write: Writes data to the transmit buffer at location RAMADDRH:RAMADDRL. Register 4. RAMRXDATA: RAM Receive Buffer Data Register R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x02 Bits7–0: RAMRXDATA: Receive Buffer Data Register Read: Returns data in the receive buffer at location RAMADDRH:RAMADDRL. Write: Writes data to the receive buffer at location RAMADDRH:RAMADDRL. 24 Rev. 1.0 C P2200/1 7.2. Internal Registers The CP2200/1 has 114 direct internal registers and 9 indirect registers. The registers are grouped into ten categories based on function. Table 10 lists the register groups and provides links to the detailed register descriptions for each group. Table 11 lists all direct registers available on the device. Table 10. CP2200/1 Register Groups RAM Access Registers Interrupt Status and Control Registers Reset Source Registers Power Mode Registers Transmit Status and Control Registers Receive Interface Status and Control Registers Receive Buffer Status and Control Registers FLASH Access Registers MAC Access Registers MAC Indirect Registers PHY Status and Control Registers Section 7.1 on page 23 Section 8 on page 30 Section 9 on page 37 Section 10 on page 43 Section 11.5 on page 49 Section 12.5 on page 60 Section 12.7 on page 67 Section 13.3 on page 75 Section 14.2 on page 78 Section 14.3 on page 80 Section 15 on page 88 Table 11. Direct Registers Register CPADDRH CPADDRL CPINFOH CPINFOL CPLENH CPLENL CPTLB FLASHADDRH FLASHADDRL FLASHAUTORD FLASHDATA FLASHERASE FLASHKEY FLASHSTA Address 0x21 0x22 0x1D 0x1E 0x1F 0x20 0x1A 0x69 0x68 0x05 0x06 0x6A 0x67 0x7B Description Current RX Packet Address High Byte Current RX Packet Address Low Byte Current RX Packet Information High Byte Current RX Packet Information Low Byte Current RX Packet Length High Byte Current RX Packet Length Low Byte Current RX Packet TLB Number Flash Address Pointer High Byte Flash Address Pointer Low Byte Flash AutoRead w/ increment Flash Read/Write Data Register Flash Erase Flash Lock and Key Flash Status Page No. page 65 page 65 page 63 page 64 page 64 page 64 page 67 page 76 page 76 page 77 page 77 page 77 page 76 page 75 Rev. 1.0 25 C P2200/1 Table 11. Direct Registers Register INT0 INT0EN INT0RD INT1 INT1EN INT1RD IOPWR MACADDR MACDATAH MACDATAL MACRW OSCPWR PHYCF PHYCN PHYSTA RAMADDRH RAMADDRL RAMRXDATA RAMTXDATA RSTEN RSTSTA RXAUTORD RXCN RXFIFOHEADH RXFIFOHEADL RXFIFOSTA RXFIFOTAILH RXFIFOTAILL RXFILT Address 0x63 0x64 0x76 0x7F 0x7D 0x7E 0x70 0x0A 0x0B 0x0C 0x0D 0x7C 0x79 0x78 0x80 0x08 0x09 0x02 0x04 0x72 0x73 0x01 0x11 0x17 0x18 0x5B 0x15 0x16 0x10 Description Interrupt Status Register 0 (Self-Clearing) Interrupt Enable Register 0 Interrupt Status Register 0 (Read-Only) Interrupt Status Register 1 (Self-Clearing) Interrupt Enable Register 1 Interrupt Status Register 1 (Read-Only) Port Input/Output Power MAC Address Pointer MAC Data Register High Byte MAC Data Register Low Byte MAC Read/Write Initiate Oscillator Power Physical Layer Configuration Physical Layer Control Physical Layer Status RAM Address Pointer High Byte RAM Address Pointer Low Byte RXFIFO RAM Data Register TXBUFF RAM Data Register Reset Enable Register Reset Source Status Register RXFIFO AutoRead w/ increment Receive Control Receive Buffer Head Pointer High Byte Receive Buffer Head Pointer Low Byte Receive Buffer Status Receive Buffer Tail Pointer High Byte Receive Buffer Tail Pointer Low Byte Receive Filter Configuration Page No. page 31 page 33 page 32 page 34 page 36 page 35 page 45 page 79 page 79 page 79 page 79 page 46 page 92 page 91 page 93 page 24 page 24 page 24 page 24 page 42 page 41 page 62 page 61 page 71 page 71 page 72 page 71 page 71 page 62 26 Rev. 1.0 C P2200/1 Table 11. Direct Registers Register RXHASHH RXHASHL RXSTA SWRST TLB0ADDRH TLB0ADDRL TLB0INFOH TLB0INFOL TLB0LENH TLB0LENL TLB1ADDRH TLB1ADDRL TLB1INFOH TLB1INFOL TLB1LENH TLB1LENL TLB2ADDRH TLB2ADDRL TLB2INFOH TLB2INFOL TLB2LENH TLB2LENL TLB3ADDRH TLB3ADDRL TLB3INFOH TLB3INFOL TLB3LENH TLB3LENL TLB4ADDRH Address 0x0E 0x0F 0x12 0x75 0x27 0x28 0x23 0x24 0x25 0x26 0x2D 0x2E 0x29 0x2A 0x2b 0x2C 0x33 0x34 0x2F 0x30 0x31 0x32 0x39 0x3A 0x35 0x36 0x37 0x38 0x3F Description Receive Hash Table High Byte Receive Hash Table Low Byte Receive Status Software Reset Register TLB0 Address High Byte TLB0 Address Low Byte TLB0 Information High Byte TLB0 Information Low Byte TLB0 Length High Byte TLB0 Length Low Byte TLB1 Address High Byte TLB1 Address Low Byte TLB1 Information High Byte TLB1 Information Low Byte TLB1 Length High Byte TLB1 Length Low Byte TLB2 Address High Byte TLB2 Address Low Byte TLB2 Information High Byte TLB2 Information Low Byte TLB2 Length High Byte TLB2 Length Low Byte TLB3 Address High Byte TLB3 Address Low Byte TLB3 Information High Byte TLB3 Information Low Byte TLB3 Length High Byte TLB3 Length Low Byte TLB4 Address High Byte Page No. page 62 page 63 page 61 page 40 page 70 page 70 page 68 page 69 page 69 page 70 page 70 page 70 page 68 page 69 page 69 page 70 page 70 page 70 page 68 page 69 page 69 page 70 page 70 page 70 page 68 page 69 page 69 page 70 page 70 Rev. 1.0 27 C P2200/1 Table 11. Direct Registers Register TLB4ADDRL TLB4INFOH TLB4INFOL TLB4LENH TLB4LENL TLB5ADDRH TLB5ADDRL TLB5INFOH TLB5INFOL TLB5LENH TLB5LENL TLB6ADDRH TLB6ADDRL TLB6INFOH TLB6INFOL TLB6LENH TLB6LENL TLB7ADDRH TLB7ADDRL TLB7INFOH TLB7INFOL TLB7LENH TLB7LENL TLBVALID TXAUTOWR TXBUSY TXCN TXENDH TXENDL Address 0x40 0x3B 0x3C 0x3D 0x3E 0x45 0x46 0x41 0x42 0x43 0x44 0x4B 0x4C 0x47 0x48 0x49 0x4A 0x51 0x52 0x4D 0x4E 0x4F 0x50 0x1C 0x03 0x54 0x53 0x57 0x58 Description TLB4 Address Low Byte TLB4 Information High Byte TLB4 Information Low Byte TLB4 Length High Byte TLB4 Length Low Byte TLB5 Address High Byte TLB5 Address Low Byte TLB5 Information High Byte TLB5 Information Low Byte TLB5 Length High Byte TLB5 Length Low Byte TLB6 Address High Byte TLB6 Address Low Byte TLB6 Information High Byte TLB6 Information Low Byte TLB6 Length High Byte TLB6 Length Low Byte TLB7 Address High Byte TLB7 Address Low Byte TLB7 Information High Byte TLB7 Information Low Byte TLB7 Length High Byte TLB7 Length Low Byte TLB Valid Indicators Transmit Data AutoWrite Transmit Busy Indicator Transmit Control Transmit Data Ending Address High Byte Transmit Data Ending Address Low Byte Page No. page 70 page 68 page 69 page 69 page 70 page 70 page 70 page 68 page 69 page 69 page 70 page 70 page 70 page 68 page 69 page 69 page 70 page 70 page 70 page 68 page 69 page 69 page 70 page 68 page 53 page 51 page 51 page 53 page 53 28 Rev. 1.0 C P2200/1 Table 11. Direct Registers Register TXPAUSEH TXPAUSEL TXPWR TXSTA0 TXSTA1 TXSTA2 TXSTA3 TXSTA4 TXSTA5 TXSTA6 TXSTARTH TXSTARTL VDMCN Address 0x55 0x56 0x7A 0x62 0x61 0x60 0x5F 0x5E 0x5D 0x5C 0x59 0x5A 0x13 Description Transmit Pause High Byte Transmit Pause Low Byte Transmitter Power Transmit Status Vector 0 Transmit Status Vector 1 Transmit Status Vector 2 Transmit Status Vector 3 Transmit Status Vector 4 Transmit Status Vector 5 Transmit Status Vector 6 Transmit Data Starting Address High Byte Transmit Data Starting Address Low Byte VDD Monitor Control Register Page No. page 52 page 52 page 46 page 57 page 56 page 56 page 55 page 55 page 54 page 54 page 52 page 52 page 39 Rev. 1.0 29 C P2200/1 8. Interrupt Sources The CP2200/1 can alert the host processor when any of the 14 interrupt source events listed in Table 12 triggers an interrupt. The CP2200/1 alerts the host by setting the appropriate flags in the interrupt status registers and driving the INT pin low. The INT pin will remain asserted until all interrupt flags for enabled interrupts have been cleared by the host. Interrupt flags are cleared by reading the self-clearing interrupt status registers, INT0 and INT1. Interrupts can be disabled by clearing the corresponding bits in INT0EN and INT1EN. If the host processor does not utilize the INT pin, it can periodically read the interrupt status registers to determine if any interrupt-generating events have occurred. The INT0RD and INT1RD read-only registers provide a method of checking for interrupts without clearing the interrupt status registers. Table 12. Interrupt Source Events Event End of Packet Receive FIFO Empty Self Initialization Complete Description The last byte of a packet has been read from the receive buffer using the AutoRead interface. The last packet in the receive buffer has been unloaded or discarded. The device is ready for Reset Initialization. See “6.2. Reset Initialization” on page 18. Pending Flag INT0.7 INT0.6 INT0.5 INT0.4 INT0.3 INT0.2 INT0.1 Enable Flag INT0EN.7 INT0EN.6 INT0EN.5 INT0EN.4 INT0EN.3 INT0EN.2 INT0EN.1 Oscillator Initialization Complete The external oscillator has stabilized. Flash Write/Erase Complete Packet Transmitted Receive FIFO Full A Flash write or erase operation has completed. The transmit interface has transmitted a packet. The receive buffer is full or the maximum number of packets has been exceeded. Decode the RXFIFOSTA status register to determine the receive buffer status. A packet has been added to the receive buffer. The device has been connected to a network. The device has been connected or disconnected from the network. The transmit interface has detected and responded to a jabber condition. See IEEE 802.3 for more information about jabber conditions. An auto-negotiation attempt has failed. Software should check for a valid link and re-try auto-negotiation. Packet Received “Wake-on-LAN” Wakeup Event Link Status Changed Jabber Detected INT0.0 INT1.5 INT1.4 INT1.3 INT0EN.0 INT1EN.5 INT1EN.4 INT1EN.3 Auto-Negotiation Failed Reserved Auto-Negotiation Complete INT1.2 INT1EN.2 An auto-negotiation attempt has completed. This interrupt only indicates completion, and not success. Occasionally, Auto-Negotiation attempts will not complete and/or fail; therefore, a 3 to 4 second timeout should be implemented. A successful auto-negotiation attempt is one that completes without failure. INT1.0 INT1EN.0 30 Rev. 1.0 C P2200/1 Register 5. INT0: Interrupt Status Register 0 (Self-Clearing) RC RC RC RC Bit4 RC Bit3 RC RC RC Reset Value EOPINT Bit7 RXEINT Bit6 SELFINT Bit5 OSCINT FLWEINT TXINT Bit2 RXFINT Bit1 RXINT Bit0 00000000 Address: 0x63 Note: Reading this register will clear all INT0 interrupt flags. Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: EOPINT: End of Packet Interrupt Flag 0: The last byte of a packet has not been read since the last time EOPINT was cleared. 1: The last byte of a packet has been read. RXEINT: Receive FIFO Empty Interrupt Flag 0: The receive FIFO has not been empty since the last time RXEINT was cleared. 1: The receive FIFO is empty. SELFINT: Self Initialization Complete Interrupt Flag 0: Self Initialization has not completed since the last time SELFINT was cleared. 1: Self Initialization has completed. OSCINT: Oscillator Initialization Complete Interrupt Flag 0: Oscillator Initialization has not completed since the last time OSCINT was cleared. 1: Oscillator Initialization has completed. FLWEINT: Flash Write/Erase Operation Complete Interrupt Flag 0: A Flash write or erase operation has not completed since the last time FLWEINT was cleared. 1: A Flash write or erase operation has completed. TXINT: Packet Transmitted Interrupt Flag 0: A packet transmission has not completed since the last time TXINT was cleared. 1: A packet has been transmitted. RXFINT: Receive FIFO Full Interrupt Flag 0: The receive FIFO has not been full since the last time RXFINT was cleared. 1: The receive FIFO is full. RXINT: Packet Received Interrupt Flag 0: A packet has not been added to the receive buffer since the last time RXINT was cleared. 1: A packet has been added to the receive buffer. Rev. 1.0 31 C P2200/1 Register 6. INT0RD: Interrupt Status Register 0 (Read-Only) R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value Address: EOPINTR RXEINTR SELFINTR OSCINTR FLWEINTR TXINTR RXFINTR RXINTR 00000000 0x76 Note: Reading this register will not clear INT0 interrupt flags. Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: EOPINTR: End of Packet Read-Only Interrupt Flag 0: The last byte of a packet has not been read since the last time EOPIF was cleared. 1: The last byte of a packet has been read. RXEINTR: Receive FIFO Empty Read-Only Interrupt Flag 0: The receive FIFO has not been empty since the last time RXFIFOE was cleared. 1: The receive FIFO is empty. SELFINTR: Self Initialization Complete Read-Only Interrupt Flag 0: Self Initialization has not completed since the last time SELFINT was cleared. 1: Self Initialization has completed. OSCINTR: Oscillator Initialization Complete Read-Only Interrupt Flag 0: Oscillator Initialization has not completed since the last time OSCINT was cleared. 1: Oscillator Initialization has completed. FLWEINTR: Flash Write/Erase Operation Complete Read-Only Interrupt Flag 0: A Flash write or erase operation has not completed since the last time FLWEINT was cleared. 1: A Flash write or erase operation has completed. TXINTR: Packet Transmitted Read-Only Interrupt Flag 0: A packet transmission has not completed since the last time TXINT was cleared. 1: A packet has been transmitted. RXFINTR: Receive FIFO Full Read-Only Interrupt Flag 0: The receive FIFO has not been full since the last time RXFINT was cleared. 1: The receive FIFO is full. RXINTR: Packet Received Read-Only Interrupt Flag 0: A packet has not been added to the receive buffer since the last time RXINT was cleared. 1: A packet has been added to the receive buffer. 32 Rev. 1.0 C P2200/1 Register 7. INT0EN: Interrupt Enable Register 0 R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W R/W Bit0 Reset Value Address: EEOPINT ERXEINT ESELFINT EOSCINT EFLWEINT ETXINT ERXFINT Bit1 ERXINT 00000000 0x64 Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: EEOPINT: Enable End of Packet Interrupt 0: Disable End of Packet Interrupt. 1: Enable End of Packet Interrupt. ERXEINT: Enable Receive FIFO Empty Interrupt 0: Disable Receive FIFO Empty Interrupt. 1: Enable Receive FIFO Empty Interrupt. ESELFINT: Enable Self Initialization Complete Interrupt 0: Disable Self Initialization Complete Interrupt. 1: Enable Self Initialization Complete Interrupt. EOSCINT: Enable Oscillator Initialization Complete Interrupt 0: Disable Oscillator Initialization Complete Interrupt. 1: Enable Oscillator Initialization Complete Interrupt. EFLWEINT: Enable Flash Write/Erase Operation Complete Interrupt 0: Disable Flash Write/Erase Operation Complete Interrupt. 1: Enable Flash Write/Erase Operation Complete Interrupt. ETXINT: Enable Packet Transmitted Interrupt 0: Disable Packet Transmitted Interrupt. 1: Enable Packet Transmitted Interrupt. ERXFINT: Enable Receive FIFO Full Interrupt 0: Disable Receive FIFO Full Interrupt. 1: Enable Receive FIFO Full Interrupt. ERXINT: Enable Packet Received Interrupt 0: Disable Packet Received Interrupt. 1: Enable Packet Received Interrupt. Rev. 1.0 33 C P2200/1 Register 8. INT1: Interrupt Status Register 1 (Self-Clearing) R/W R/W RC Bit5 RC Bit4 RC RC RC RC Bit0 Reset Value Address: — Bit7 — Bit6 WAKEINT LINKINT JABINT Bit3 Reserved Bit2 RFINT Bit1 ANCINT 00000000 0x7F Note: Reading this register will clear all INT1 interrupt flags. Bits 7–6: UNUSED. Read = 00b, Write = don’t care. Bit 5: WAKEINT: “Wake-on-Lan” Interrupt Flag 0: The device has not been connected to a network since the last time WAKEINT was cleared. 1: The device has been connected to a network since the last time WAKEINT was cleared. Bit 4: LINKINT: Link Status Changed Interrupt Flag 0: The link status has not changed since the last time LINKINT was cleared. 1: The link status has changed (device has been connected or removed from a network). Bit 3: JABINT: Jabber Detected Interrupt Flag 0: A jabber condition has not been detected since the last time JABINT was cleared. 1: A jabber condition has been detected. Bit 2: ANFINT: Auto-Negotiation Failed Interrupt Flag 0: Auto-Negotiation has not failed since the last time ANFINT was cleared. 1: Auto-Negotiation has failed. Bit 1: Reserved: Read = 0. Bit 0: ANCINT: Auto-Negotiation Complete Interrupt 0: Auto-Negotiation has not completed since the last time ANCINT was cleared. 1: Auto-Negotiation has completed. 34 Rev. 1.0 C P2200/1 Register 9. INT1RD: Interrupt Status Register 1 (Read-Only) R/W R/W R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value Address: — Bit7 — Bit6 WAKEINTR LINKINTR JABINTR ANFINTR Reserved ANCINTR 00000000 0x7E Note: Reading this register will not clear INT1 interrupt flags. Bits 7–6: UNUSED. Read = 00b, Write = don’t care. Bit 5: WAKEINTR: “Wake-on-Lan” Read-Only Interrupt Flag 0: The device has not been connected to a network since the last time WAKEINT was cleared. 1: The device has been connected to a network since the last time WAKEINT was cleared. Bit 4: LINKINTR: Link Status Changed Read-Only Interrupt Flag 0: The link status has not changed since the last time LINKINT was cleared. 1: The link status has changed (device has been connected or removed from a network). Bit 3: JABINTR: Jabber Detected Read-Only Interrupt Flag 0: A jabber condition has not been detected since the last time JABINT was cleared. 1: A jabber condition has been detected. Bit 2: ANFINTR: Auto-Negotiation Failed Read-Only Interrupt Flag 0: Auto-Negotiation has not failed since the last time ANFINT was cleared. 1: Auto-Negotiation has failed. Bit 1: Reserved: Read = 0b. Bit 0: ANCINTR: Auto-Negotiation Complete Read-Only Interrupt Flag 0: Auto-Negotiation has not completed since the last time ANCINT was cleared. 1: Auto-Negotiation has completed. Rev. 1.0 35 C P2200/1 Register 10. INT1EN: Interrupt Enable Register 1 R/W R/W R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value Address: — Bit7 — Bit6 EWAKEINT ELINKINT EJABINT EANFINT Reserved EANCINT 00000000 0x7D Bits 7–6: UNUSED. Read = 00b, Write = don’t care. Bit 5: EWAKEINT: Enable “Wake-on-Lan” Interrupt 0: Disable “Wake-on-Lan” Interrupt. 1: Enable “Wake-on-Lan” Interrupt. Bit 4: ELINKINT: Enable Link Status Changed Interrupt 0: Disable Link Status Changed Interrupt. 1: Enable Link Status Changed Interrupt. Bit 3: EJABINT: Enable Jabber Detected Interrupt 0: Disable Jabber Detected Interrupt. 1: Enable Jabber Detected Interrupt. Bit 2: EANFINT: Enable Auto-Negotiation Failed Interrupt 0: Disable Auto-Negotiation Failed Interrupt. 1: Enable Auto-Negotiation Failed Interrupt. Bit 1: Reserved: Read = 0b. Must write 0b. Bit 0: EANCINT: Enable Auto-Negotiation Complete Interrupt 0: Disable Auto-Negotiation Complete Interrupt. 1: Enable Auto-Negotiation Complete Interrupt. 36 Rev. 1.0 C P2200/1 9. Reset Sources Reset circuitry allows the CP2200/1 to be easily placed in a predefined default condition. Upon entry to this reset state, the following events occur: All direct and indirect registers are initialized to their defined reset values. Digital pins (except /RST) are forced into a high impedance state with a weak pull-up to VDD. Analog pins (TX+/TX–, RX+/RX–) are forced into a high impedance state without a weak pull-up. The external oscillator is stopped and /RST driven low (except on a software reset). All interrupts are enabled. The contents of the transmit and receive buffers are unaffected by a reset as long as the device has maintained sufficient supply voltage. However, since the buffer pointers are reset to their default values, the data is effectively lost unless the host processor has kept track of the starting address and length of each packet in the buffer. The CP2200/1 has five reset sources that place the device in the reset state. The method of entry to the reset state determines the amount of time spent in reset and the behavior of the /RST pin. Each of the following reset sources is described in the following sections: Power-On Power-Fail Oscillator-Fail External /RST Pin Software Command Upon exit from the reset state, the device automatically starts the external oscillator and waits for it to settle (this step is skipped on software reset). Once the crystal oscillator settles, the Oscillator Initialization Complete interrupt occurs (interrupt pin asserted), and the host processor may now access the internal registers to poll for the Self Initialization Complete Interrupt. If the host does not have access to the interrupt signal, it should wait approximately 1 ms after the rising edge of reset pin prior to polling the internal registers. Note that the reset pin could remain low up to 100 ms depending on the power supply ramp time. The device is fully functional after the Self Initialization has completed. See “6.2. Reset Initialization” on page 18 for the recommended initialization procedure following a device reset. Rev. 1.0 37 C P2200/1 9.1. Power-On Reset During power-up, the CP2200/1 is held in the reset state, and the /RST pin is driven low until VDD settles above VRST. A delay (TPORDelay) occurs between the time VDD reaches VRST and the time the device is released from reset; the typical delay is 5 ms. Refer to Table 13 for the Electrical Characteristics of the power supply monitor circuit. volts VDD V RST 1.0 VD D t Logic HIGH /RST T PORDelay VDD Monitor Reset Logic LOW Power-On Reset Figure 14. Reset Timing 38 Rev. 1.0 C P2200/1 9.2. Power-fail When a power-down transition or power irregularity causes VDD to drop below VRST, the power supply monitor will drive the /RST pin low and return the CP2200/1 to the reset state. When VDD returns to a level above VRST, the CP2200/1 will be released from the reset state as shown in Figure 14. The power supply monitor circuit (VDD Monitor) is enabled and selected as a reset source by hardware following every power-on reset. To prevent the device from being held in reset when VDD drops below VRST, the VDD Monitor may be deselected as a reset source (see RSTEN on page 42) and disabled (see VDMCN on page 39). It is recommended to leave the VDD Monitor enabled and selected as a reset source at all times. Register 11. VDMCN: VDD Monitor Control Register R/W Bit7 R/W Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value Address: VDMEN VDDSTAT Reserved Reserved Reserved Reserved Reserved Reserved 00000000 0x13 VDMEN: VDD Monitor Enable This bit can be used to disable or enable the VDD Monitor Circuit. Note: The VDD Monitor circuit is enabled and selected as a reset source following every power-on reset. If the VDD Monitor is disabled and then reenabled during device operation, it must be allowed to stabilize before it is selected as a reset source. Selecting the VDD Monitor as a reset source before it has stabilized will generate a system reset. See Table 13 on page 42 for the minimum VDD Monitor turn-on time. 0: VDD Monitor Disabled. 1: VDD Monitor Enabled. Bit6: VDDSTAT: VDD Status This bit indicates the current power supply status (VDD Monitor output). 0: VDD voltage is at or below the VDD Monitor threshold. 1: VDD voltage is above the VDD Monitor threshold. Bits 5–0: RESERVED. Read = varies; Write = don’t care. Bit 7: 9.3. Oscillator-Fail Reset If the system clock derived from the oscillator fails for any reason after oscillator initialization is complete, the reset circuitry will drive the /RST pin low and return the CP2200/1 to the reset state. The CP2200/1 will remain in the reset state for approximately 1 ms then exit the reset state in the same manner as that for the power-on reset. 9.4. External Pin Reset The external /RST pin provides a means for external circuitry to force the CP2200/1 into a reset state. Asserting the /RST pin low will cause the CP2200/1 to enter the reset state. It is recommended to provide an external pull-up and/or decoupling capacitor of the /RST pin to avoid erroneous noise-induced resets. The CP2200/1 will exit the reset state approximately 4 µs after a logic high is detected on /RST. Rev. 1.0 39 C P2200/1 9.5. Software Reset The software reset provides the host CPU the ability to reset the CP2200/1 through the parallel host interface. Writing a ‘1’ to RESET (SWRST.2) will force the device to enter the reset state with the exception that the external oscillator will not be stopped. As soon as the device enters the reset state, it will immediately exit the reset state and start device calibration; the Oscillator Initialization Complete interrupt is not be generated. After Self Initialization is complete, the device is fully functional. Note: The software reset is enabled after every reset; however, it may be de-selected as a reset source (see the register description for RSTEN on page 42). Register 12. SWRST: Software Reset Register R\W R\W R/W R/W R/W W R/W R/W Reset Value — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 RESET Bit2 — Bit1 — Bit0 00000000 Address: 0x75 Bits 7–3: UNUSED. Read = 00000b, Write = don’t care. Bit 2: RESET: Software Reset Initiate Writing a ‘1’ to this bit will generate a software reset. Bits 1–0: UNUSED. Read = 00b, Write = don’t care. 40 Rev. 1.0 C P2200/1 9.6. Determining the Source of the Last Reset The RSTSTA register can be used to determine the cause of the last reset. Note: If the PORSI bit is set to logic 1, all other bits in RSTSTA are undefined. It is impossible to differentiate between a power-on, power-fail, and oscillator-fail reset by reading the RSTSTA register. Register 13. RSTSTA: Reset Source Status Register R/W R/W R/W R/W R/W R R R Reset Value — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 SWRSI Bit2 PORSI Bit1 PINRSI Bit0 00000000 Address: 0x73 Bits 7–3: UNUSED. Read = 00000b, Write = don’t care. Bit 2: SWRSI: Software Reset Indicator 0: Source of last reset was not a write to RESET (SWRESET.2). 1: Source of last reset was a write to RESET (SWRESET.2). Bit 1: PORSI: Power-On / Power-Fail / Oscillator-Fail Reset Indicator 0: Source of last reset was not a power-on, power-fail, or oscillator-fail event. 1: Source of last reset was a power-on, power-fail, or oscillator-fail event. Bit 0: PINRSI: External Pin Reset Indicator 0: Source of last reset was not the /RST pin. 1: Source of last reset was the /RST pin. Rev. 1.0 41 C P2200/1 9.7. De-Selecting Interrupt Sources The power-fail (VDD Monitor) reset is automatically enabled after every power-on reset. The software reset is enabled after every device reset, regardless of the reset source. The RSTEN register can be used to prevent either of these two reset sources from generating a device reset. Register 14. RSTEN: Reset Enable Register R/W R/W R/W R/W R/W R/W Bit2 R/W Bit1 R/W Reset Value — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 ESWRST EPFRST — Bit0 00000100 Address: 0x72 Bits 7–3: UNUSED. Read = 00000b, Write = don’t care. Bit 2: ESWRST: Enable Software Reset 0: Software reset is not selected as a reset source. 1: Software reset is selected as a reset source. Bit 1: EPFRST: Enable Power Fail Reset 0: The power fail detection circuitry (VDD Monitor) is not selected as a reset source. 1: The power fail detection circuitry (VDD Monitor) is selected as a reset source. Bit 0: UNUSED. Read = 0b, Write = don’t care. Table 13. Reset Electrical Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameters RST Output Low Voltage RST Input High Voltage RST Input Low Voltage RST Input Pullup Current VDD POR Threshold (VRST) Minimum /RST Low Time to Generate a System Reset VDD Monitor Turn-on Time VDD Monitor Supply Current Conditions IOL = 8.5 mA Min — 0.7 x VDD — — 2.2 15 100 — Typ — — — 25 2.4 — — 20 Max 0.6 — 0.3 x VDD 50 2.6 — — 50 UNITS V V V µA V µs µs 42 Rev. 1.0 C P2200/1 10. Power Modes The CP2200/1 has four power modes that can be used to minimize overall system power consumption. The power modes vary in device functionality and recovery methods. Each of the following power modes is explained in the following sections: Normal Mode (Device Fully Functional) Link Detection Mode (Transmitter Disabled) Memory Mode (Transmitter and Receiver Disabled) Shutdown Mode (Oscillator Output Disabled) The power modes above are achieved by disabling specific primary functions of the CP2200/1. Figure 15 shows how power is distributed throughout the CP2200/1. To further reduce power consumption in any of the power modes, secondary device functions may be turned off individually. The secondary device functions that may be turned off are: Link/Activity LED Drivers Weak pull-ups to VDD VDD Monitor VDD VDMCN.7 PHYCN.7 Weak Pullups All Digital Pins Link LED VDD Monitor Activity LED System Clock (Oscillator) OSCPWR.0 IOPWR PHY LINK (LA) Pin ACT Pin TXEN (PHYCN.6) Transmitter Parallel Host Interface TX and RX Buffers RXEN (PHYCN.5) Receiver MAC Flash Memory Figure 15. Power and Clock Distribution Control Rev. 1.0 43 C P2200/1 10.1. Normal Mode Normal Mode should is used whenever the host is sending or receiving packets. In this mode, the CP2200/01 is fully functional. Typical Normal Mode power consumption is listed in Table 2 on page 9. Note: When in normal mode, the transmitter has a power saving mode which is enabled on reset. This power saving mode disables the transmitter's output driver and placed the TX+/- pins in high impedance when the CP220x is not transmitting link pulses or data. To meet the minimum transmitter loss requirements in IEEE 802.3, this power saving mode should be disabled. See Register 17, “TXPWR: Transmitter Power Register,” on page 46 for details. 10.2. Link Detection Mode In Link Detection Mode, the transmitter and link pulse generation logic is disabled. The CP2200/1 will appear to be “offline” because link pulses will not be generated. The most common way to use Link Detection Mode is enabling the Wake-on-LAN interrupt, placing the CP2200/01 into Link Detection Mode, then placing the MCU in a low power mode until the system is plugged into a network. Note: When using link detection mode, the user should ensure that the link partner is always transmitting link pulses. An example of this type of device would be a hub or a switch. Some notebook PCs implement a power saving feature in which they stop transmitting link pulses if a valid link is not detected. This would create a situation where both link partners are waiting for each other to start transmitting link pulses. Note: A minimum transmitter return loss is specified in IEEE 802.3. If the transmitter is disabled, the TX± pins are placed in high impedance mode and do not create the minimum return loss. The transmitter should not be disabled if the device is considered "on a network" and valid link pulses are being received. From Normal Mode, the device can be placed in Link Detection Mode by clearing TXEN (PHYCN.6) to “0”. To return the device to Normal Mode, disable the physical layer by clearing PHYCN to 0x00, then re-enable the physical layer using the startup procedure in Section 15.7 on page 90. 10.3. Memory Mode In Memory Mode, the physical layer (receiver and transmitter) is placed in a low-power state, and the CP2200/1 can neither send nor receive packets. The only primary functions of the device that remain functional are the Flash memory and RAM buffers. The RAM buffers are only accessible using the Random Access method described in Section 7.1 on page 23. The device can be placed in Memory Mode by clearing the three most significant bits of the PHYCN register to ‘000’. The device can be returned to normal mode by setting the three most significant bits of the PHYCN register to ‘111’ and waiting the appropriate physical layer turn-on times for both the transmitter and the receiver. The physical layer electrical characteristics including turn-on time are specified in Table 22 on page 93. To return the device to Normal Mode, disable the physical layer by clearing PHYCN to 0x00, then re-enable the physical layer using the startup procedure in Section 15.7 on page 90. 10.4. Shutdown Mode Shutdown Mode is the lowest power mode for the CP2200/1. All primary and secondary functions are disabled, and the system clock is disconnected from the oscillator. The device can recover from Shutdown Mode only through a power-on or pin reset. The device can be placed in Shutdown Mode using the following procedure: Step 1: Disable the PHY by clearing the three most significant bits of PHYCN to ‘000’. Step 2: Disable the LED drivers by clearing bits 2 and 3 of IOPWR to ‘00’. Step 3: Disable the VDD Monitor (optional) by clearing VDMEN (VDMCN.7) to ‘0’. Step 4: Disconnect the oscillator output from the rest of the device by clearing OSCOE (OSCPWR.0) to ‘0’. This step should be performed last because the device will no longer respond until the next pin or power-on reset. 44 Rev. 1.0 C P2200/1 10.5. Disabling Secondary Device Functions The LED Drivers, weak pull-ups, and VDD Monitor can be disabled to minimize power consumption. The typical supply current for the VDD Monitor is specified in Table 13 on page 42. Disabling weak pull-ups will save current if the MOTEN and MUXEN pins are tied to ground, but will cause the address and data pins to float (causing undefined device behavior and increased power consumption) if they are not externally driven or pulled to a defined logic level using pull-up or pull-down resistors. The internal weak pull-ups should not be disabled unless all digital pins are externally driven to a logic high or logic low state. Register 15. IOPWR: Port Input/Output Power Register R/W R/W R/W R/W R/W R/W R/W R/W Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 — Bit4 ACTEN Bit3 LINKEN Bit2 WEAKD Bit1 Reserved 00000000 0x70 Bits 7–4: UNUSED. Read = 0000b, Write = don’t care. Bit 3 ACTEN: Activity LED Enable 0: Activity LED disabled. 1: Activity LED enabled. Bit 2 LINKEN: Link LED Enable (Link/Activity LED on CP2201) 0: Link (Link/Activity) LED disabled. 1: Link (Link/Activity) LED enabled. Bit 1: WEAKD: Weak Pull-up Disable 0: Weak pull-ups are enabled. 1: Weak pull-ups are disabled. Bit 0: Reserved. Read = 0b; Must write 0b. Rev. 1.0 45 C P2200/1 Register 16. OSCPWR: Oscillator Power Register R/W R/W R/W R/W Bit4 R/W Bit3 R/W Bit2 R Bit1 R/W Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 Reserved Reserved Reserved Reserved OSCOE 00000010 0x7C Bits 7–5: Bit 4–2: Bit 1: Bit 0: UNUSED. Read = 0000b, Write = don’t care. RESERVED. Read = 100b; Must write x00b. UNUSED. Read = 1b; Write = don’t care. OSCOE: Oscillator Output Enable This bit controls the output of the external oscillator. It does not affect the external crystal driver. 0: Oscillator output disabled. The device will no longer respond until the next reset. 1: Oscillator output enabled. Register 17. TXPWR: Transmitter Power Register R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value Address: PSAVED Reserved Reserved Reserved Reserved Reserved Reserved Reserved 00000000 0x7A PSAVED. Transmitter Power Save Mode Disable Bit 0: Enable transmitter power saving mode. 1: Disable transmitter power saving mode. Bits 6–0: Reserved. Read = varies; Must write 0000000b. Bit 7: 46 Rev. 1.0 C P2200/1 11. Transmit Interface 11.1. Overview The CP2200/1 provides a simple interface for transmitting Ethernet packets requiring the host to only load the source and destination addresses, length/type, and data into the transmit buffer. All other IEEE 802.3 requirements, such as the preamble, start frame delimiter, CRC, and padding (full-duplex only), are automatically generated. Figure 16 shows a typical Ethernet packet. Preamble and Start Frame Delimiter (8 bytes) Destination MAC Address (6 bytes) Source MAC Address (6 bytes) Length/Type (2 bytes) Data (46 to 1500 bytes) (Automatically padded with zeros if less than 46 bytes) CRC (4 bytes) Ethernet Frame (minimum 64 bytes) Obtained from Transmit Buffer Figure 16. Typical Ethernet Packet Rev. 1.0 47 C P2200/1 11.2. Transmitting a Packet Once reset initialization is complete (See ), the CP2200/1 is ready to transmit Ethernet packets. The following procedure can be used to transmit a packet: Step 1: Wait for the previous packet to complete (TXBUSY == 0x00). The worst case time to transmit a packet is 500 ms in half-duplex mode with exponential backoff. Step 2: Set the TXSTARTH:TXSTARTL transmit buffer pointer to 0x0000. Step 3: If the last packet was aborted ((TXSTA3 & 0xF8) != 0x00), then this packet must be loaded into the transmit buffer using the Random Memory Access Method: a. Set RAMADDRH:RAMADDRL to 0x0000. b. Write the first data byte to RAMTXDATA. c. Increment RAMADDRH:RAMADDRL. d. Write another data byte to RAMTXDATA. e. Repeat steps c and d until the entire packet is loaded. f. Pad small packets to at least 64 bytes. g. Set TXENDH:TXENDL to the address of the last byte added. This value must be greater than or equal to 0x0040. Step 4: If the last packet was successfully transmitted ((TXSTA2 & 0x80) == 0x80), then this packet may be loaded into the transmit buffer using the AutoWrite Interface: a. Write all data bytes to the TXAUTOWR register, one byte at time. b. If the MAC is in half-duplex mode, pad small packets to at least 64 bytes. Step 5: Set the TXSTARTH:TXSTARTL transmit buffer pointer back to 0x0000. Step 6: Write a ‘1’ to the TXGO bit (TXCN.0) to begin transmission. Note: Step 4 may be skipped if Step 3 is always performed. 11.3. Overriding Transmit Configuration Options The global transmit configuration options are set in the MAC registers. The transmit interface allows the host processor to customize packet transmission on a per-packet basis by overriding the global MAC settings. The following options can be overridden by the transmit interface: Short Frame Padding—When enabled, ensures that no frame smaller than 64 bytes is transmitted. The frame size does not include the 8 byte preamble; however, the 4-byte CRC field is included. CRC Generation—When enabled, a 32-bit CRC will be calculated and appended to the Ethernet frame. Pause packet transmission (Full Duplex Mode)—When enabled, an Ethernet PAUSE packet with a pause value of TXPAUSEH:TXPAUSEL is transmitted. The pause value is in units of 512 bit times (51.2 µs). Application of Back Pressure (Half Duplex Mode). Switching between Half/Full Duplex Modes. Note: This setting does not affect the physical layer. 11.4. Transmit Buffer and AutoWrite Interface The transmit buffer provides the AutoWrite interface to efficiently load the buffer with an entire packet. The interface consists of three registers: TXSTART, TXEND, and TXAUTOWR. The TXSTART register points to the address of the next available byte and can be reset to the first byte of the buffer. TXEND points to the last byte added to the buffer. TXAUTOWR is the data register. Each write to TXAUTOWR sets TXEND to the address of the byte written and increments TXSTART. After the packet is loaded into the buffer, TXSTART is reset to 0x0000 to mark the starting point of the packet. TXEND will continue to point to the last byte in the packet. Note: The AutoWrite Interface cannot be used following an aborted packet. This only applies if the device is in half-duplex mode. 48 Rev. 1.0 C P2200/1 11.5. Transmit Status and Control Registers The CP2200 transmit interface is controlled and managed through the registers in Table 14. After each packet is transmitted, information about the last transmitted packet can be obtained from the 52-bit transmit status vector accessible through the TXSTA0 — TXSTA6 registers. The transmit status vector is described in Table 15. Table 14. Transmit Status and Control Register Summary Register TXCN Long Name Transmit Control Address 0x53 Description Contains the transmit configuration option override bits and the TXGO bit used to start packet transmission. Read-only register returning 0x01 when transmit interface is currently transmitting a packet and 0x00 when transmit interface is not transmitting. 16-bit pause value used for PAUSE packet transmission. The pause value is in units of 512 bit times (51.2μs). Starting address of outgoing packet in the transmit buffer. Packets added to the transmit buffer must start at 0x0000. Address of last byte added to the transmit buffer. This register is managed by hardware. Writes to this register add a byte to the transmit buffer, set TXEND to the address of the written byte, and increment TXSTART. 52-bit transmit status vector containing information about the last transmitted packet including collision count, successful transmission, total bytes transmitted, etc. TXBUSY Transmit Busy Indicator 0x54 TXPAUSEH TXPAUSEL TXSTARTH TXSTARTL TXENDH TXENDL Transmit Pause High and Low Bytes 0x55 0x56 0x59 0x5A 0x57 0x58 0x03 Transmit Data Starting Address High and Low Bytes Transmit Data Ending Address High and Low Bytes TXAUTOWR Transmit Data AutoWrite TXSTA6 TXSTA5 TXSTA4 TXSTA3 TXSTA2 TXSTA1 TXSTA0 Transmit Status Vector 0x5C 0x5D 0x5E 0x5F 0x60 0x61 0x62 Rev. 1.0 49 C P2200/1 Table 15. Transmit Status Vector Description Bit 51 50 49 48 47-32 31 30 29 28 27 26 25 24 23 22 21 20 19-16 15-0 Field Name Transmitted VLAN Frame Back Pressure Applied Transmitted PAUSE Frame Transmitted Control Frame Total Bytes Transmitted Transmit Under-Run Jumbo Packet Detected Late Collision Detected Excessive Collisions Detected Excessive Delay Detected Delay Detected Transmitted Broadcast Packet Transmitted Multicast Packet Transmit Successful Type Field Detected Length Check Error CRC Error Transmit Collision Count Transmit Byte Count Description Last frame transmitted had length/type field of 0x8100 (VLAN protocol Identifier). Back pressure was applied during transmission. Last frame transmitted was a valid PAUSE control frame. Last frame transmitted was a control frame. Number of bytes transmitted on wire including all bytes from collided attempts. Last packet was aborted due to a data under-run condition. Last packet was aborted due to the detection of a Jumbo packet (oversized frame). Jumbo packets are not supported. Last packet was aborted due to a collision occurring after the 51.2 µs collision window. Last packet was aborted due to detection of 16 or more collisions. Aborted due to a delay longer than 2.42ms. Last packet was transmitted, but had delay (less than 2.42 ms). Last packet transmitted had a broadcast destination address. Last packet transmitted had a multicast destination address. Last packet was successfully transmitted. Last packet’s length/type field had a value greater than 1500. Last packet’s length/type field had a value less than or equal to 1500 which did not match the actual frame length. Last packet’s CRC field did not match the internally generated CRC. Number of collisions encountered during transmission of the last packet. Number of bytes in last frame not counting collided bytes. 50 Rev. 1.0 C P2200/1 Register 18. TXCN: Transmit Control Register R/W R/W R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 W Reset Value OVRRIDE Bit7 — Bit6 CRCENOV PADENOV TXPPKT BCKPRES FDPLXOV TXGO Bit0 00000000 Address: 0x53 Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: OVRRIDE: Default Override 0: Settings for bits 5, 4, 3, 2, and 1 in TXCN will be ignored. MAC settings will take effect. 1: Settings for bits 5, 4, 3, 2, and 1 in TXCN will be applied. MAC settings will be overridden. UNUSED. Read = 0b, Write = don’t care. CRCENOV: CRC Enable 0: Disable CRC append on transmission. 1: Enable CRC append on transmission. PADENOV: Pad Enable 0: Disable padding of short frames. 1: Enable padding of short frames. TXPPKT: Transmit a PAUSE control packet 0: Normal packet transmission. Packet data will be obtained from the transmit buffer. 1: A PAUSE control packet with the value of TXPAUSEH:TXPAUSEL will be transmitted. Data in the transmit buffer will not be accessed. PAUSE control packets are only valid in full-duplex mode. BCKPRES: Apply Back Pressure 0: Normal packet transmission. Back pressure will not be applied. 1: Back pressure will be applied on transmission (only valid in half duplex mode). FDPLXOV: Full Duplex Operation Note: The transmit interface, MAC, and physical layer must be configured to the same duplex mode. 0: Transmit interface operates in half duplex mode. 1: Transmit interface operates in full duplex mode. TXGO: Transmit Packet Set this bit to ‘1’ to begin transmission of a packet. Note: TXGO should not be set to one if both TXSTART and TXEND are zero (i.e., no data has been added to the buffer). Bit 2: Bit 1: Bit 0: Register 19. TXBUSY: Transmit Busy Indicator R R R R R R R R Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 — Bit2 — Bit1 TXBUSY 00000000 0x54 Bits 7–1: UNUSED. Read = 0000000b, Write = don’t care. Bit 0: TXBUSY: Packet Transmit Status 0: Packet Transmit is not in progress. 1: Packet Transmit is in progress. Rev. 1.0 51 C P2200/1 Register 20. TXPAUSEH: Transmit Pause High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x55 Bits 7–0: TXPAUSEH: Transmit Pause High Byte High byte of the 16-bit pause value sent in a PAUSE control packet. The pause value is in units of 512 bit times (512 bit times = 51.2 µs). Register 21. TXPAUSEL: Transmit Pause Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x56 Bits 7–0: TXPAUSEL: Transmit Pause Low Byte Low byte of the 16-bit pause value sent in a PAUSE control packet. The pause value is in units of 512 bit times (512 bit times = 51.2 µs). Register 22. TXSTARTH: Transmit Data Starting Address High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x59 Bits 7–0: TXSTARTH: Transmit Data Starting Address High Byte High byte of the starting address of outgoing packet in the transmit buffer. Note: Outgoing packets must start at 0x0000. Register 23. TXSTARTL: Transmit Data Starting Address Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x5A Bits 7–0: TXSTARTL: Transmit Data Starting Address Low Byte Low byte of the starting address of outgoing packet in the transmit buffer. Note: Outgoing packets must start at 0x0000. 52 Rev. 1.0 C P2200/1 Register 24. TXENDH: Transmit Data Ending Address High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x57 Bits 7–0: TXENDH: Transmit Data Ending Address High Byte High byte of the address of the last byte added to the transmit buffer. Register 25. TXENDL: Transmit Data Ending Address Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x58 Bits 7–0: TXENDL: Transmit Data Ending Address Low Byte Low byte of the address of the last byte added to the transmit buffer. Register 26. TXAUTOWR: Transmit Data AutoWrite R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x03 Bits 7–0: TXSTARTL: Transmit Data Starting Address Low Byte Writes to this register add a single byte to the transmit buffer and set the TXEND pointer to the address of the byte currently being written. Rev. 1.0 53 C P2200/1 Register 27. TXSTA6: Transmit Status Vector 6 R/W R/W R/W R/W R Bit3 R Bit2 R R Reset Value — Bit7 — Bit6 — Bit5 — Bit4 TXVLAN BCKPRES TXPF Bit1 TXCF Bit0 00000000 Address: 0x5C Note: This register contains bits 51–48 of the Transmit Status Vector. Bits 7–4: UNUSED. Read = 0000b, Write = don’t care. Bit 3. TXVLAN: Transmitted VLAN Frame 0: Transmitted frame had length/type field of 0x8100. 1: Transmitted frame did not have a length/type field of 0x8100. Bit 2: BCKPRES: Back Pressure Applied 0: Back pressure was not applied during transmission. 1: Back pressure was applied during transmission. Bit 1: TXPF: Transmitted PAUSE Frame 0: Transmitted frame was not a PAUSE control frame. 1: Transmitted frame was a valid PAUSE control frame. Bit 0: TXCF: Transmitted Control Frame 0: Transmitted frame was not a control frame. 1: Transmitted frame was a control frame. Register 28. TXSTA5: Transmit Status Vector 5 R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x5D Note: This register contains bits 47–40 of the Transmit Status Vector. Bits 7–0: TXSTA5: Total Bytes Transmitted High Byte The most significant 8-bits of the total number of bytes transmitted on the wire, including all bytes from collided attempts. 54 Rev. 1.0 C P2200/1 Register 29. TXSTA4: Transmit Status Vector 4 R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x5E Note: This register contains bits 40-32 of the Transmit Status Vector. Bits 7-0: TXSTA4: Total Bytes Transmitted Low Byte The least significant 8-bits of the total number of bytes transmitted on the wire, including all bytes from collided attempts. Register 30. TXSTA3: Transmit Status Vector 3 R Bit7 R Bit6 R Bit5 R R R R Bit1 R Bit0 Reset Value Address: TXURUN TXJUMBO TXLTCL TXEXCL Bit4 TXEXDE Bit3 TXDE Bit2 TXBCAST TXMCAST 00000000 0x5F Note: This register contains bits 31–24 of the Transmit Status Vector. Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: TXURUN: Transmit Under-Run 0: Transmit under-run did not occur. 1: Packet aborted due to data under-run condition. TXJUMBO: Jumbo Packet Detected 0: Transmitted packet was not oversized. 1: Packet aborted due to its excessive size. TXLTCL: Late Collision Detected 0: Late collision was not detected. 1: Packet aborted due to the detection of a collision after the 51.2 us collision window. TXEXCL: Excessive Collisions Detected 0: Number of collisions on transmission was less than 16. 1: Packet aborted due to detection of 16 or more collisions. TXEXDE: Excessive Delay Detected 0: Packet was transmitted without an excessive delay (greater than 2.42 ms). Please check other flags for information. 1: Packet was aborted due to an excessive delay (greater than 2.42 ms). TXDE: Delay Detected 0: Packet was transmitted with no delay or was aborted. Please check other flags for information. 1: Packet was transmitted, but had some delay (less than 2.4 ms). TXBCAST: Transmitted Broadcast Packet 0: Transmitted packet did not have a broadcast destination address. 1: Transmitted packet had a broadcast destination address. TXMCAST: Transmitted Multicast Packet 0: Transmitted packet did not have a multicast destination address. 1: Transmit packet had a multicast destination address. Bit 2: Bit 1: Bit 0: Rev. 1.0 55 C P2200/1 Register 31. TXSTA2: Transmit Status Vector 2 R R Bit6 R Bit5 R Bit4 R Bit3 R R R Bit0 Reset Value Address: TXOK Bit7 TXTYPE TXLCERR TXCRCER TXCOL3 TXCOL2 Bit2 TXCOL1 Bit1 TXCOL0 00000000 0x60 Note: This register contains bits 23–16 of the Transmit Status Vector. Bit 7: TXOK: Transmit Successful 0: Transmission was aborted. 1: Transmission was successful. Bit 6: TXLOOR: Type Field Detected 0: Last packet’s type/length field was used as a length. 1: Last packet’s type/length field was used as a type. Bit 5: TXLCERR: Length Check Error 0: Last packet’s length field matched the actual frame length. 1: Last packet’s length field did not match the actual frame length. Bit 4: TXCRCER: CRC Error 0: Last packet’s CRC matched the internally generated CRC. 1: Last packet’s CRC did not match the internally generated CRC. Bits 3–0: TXCOL3-0: Transmit Collision Count Number of collisions encountered during transmission of the last packet. Note: This bit field does not overflow and will remain at 1111b (15 collisions) if 15 or more collisions are encountered. Register 32. TXSTA1: Transmit Status Vector 1 R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x61 Note: This register contains bits 15–8 of the Transmit Status Vector. Bits 7–0: TXSTA1: Transmit Byte Count High Byte The most significant 8-bits of the number of bytes in the last transmitted frame. Does not include bytes transmitted due to collided attempts. 56 Rev. 1.0 C P2200/1 Register 33. TXSTA0: Transmit Status Vector 0 R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x62 Note: This register contains bits 15–8 of the Transmit Status Vector. Bits 7–0: TXSTA0: Transmit Byte Count Low Byte The least significant 8-bits of the number of bytes in the last transmitted frame. Does not include bytes transmitted due to collided attempts. Rev. 1.0 57 C P2200/1 12. Receive Interface 12.1. Overview The CP2200/1 has a 4k circular receive FIFO buffer and an 8 entry translation look-aside buffer (TLB) capable of storing up to 8 packets at a time. Each TLB entry holds the starting address, length, and other information about a single received packet. Once a packet is received, the host microcontroller is notified using the interrupt request pin. The host microcontroller may then copy the contents of the packet to its local memory through the host interface or skip the packet by writing ‘1’ to RXSKIP (RXCN.1). Skipped packets remain in memory but will be overwritten as new packets arrive. The receive interface has an advanced receive filter and hash table to prevent unwanted packets from reaching the receive buffer. For all packet types not supported by the receive filter, the CP2200/1 allows the host microcontroller complete random access to the receive buffer. The host microcontroller can check specific bytes in the packet to determine whether or not to copy the packet. . Host Interface Registers Autoread Interface: A utoread Data Register P acket Skip Bit Current Packet: P acket Address P acket Length P acket Information 4 KB Receive Buffer with 8-entry TLB Programmable Receive Filter and Hash Table Figure 17. Receive Interface Block Diagram 12.2. Reading a Packet Using the Autoread Interface Once reset initialization is complete (Section 6.2 on page 18) and the receive buffer, filter, and hash table (Section 12.4) are initialized, the CP2200/1 is ready to receive Ethernet packets. After receiving notification of a new packet, the following procedure can be used to read the packet: Step 1: Read RXVALID (CPINFOH.7) and RXOK (CPINFOL.7) to check if the current packet was received correctly. The host processor may optionally use the packet starting address CPADDR to read specific bytes in the packet and determine whether to copy or skip the current packet. The random access method described in Section 7.1 on page 23 can be used to access the buffer. Step 2: If RXVALID or RXOK is 0, or to skip the packet, write a ‘1’ to RXSKIP (RXCN.1). If RXVALID and RXOK are 1, read the length of the current packet from CPLENH:CPLENL. Step 3: Read the entire packet, one byte at a time, by reading RXAUTORD. Step 4: If the entire packet was read, write a ‘1’ to RXCLRV (RXCN.2). If there are any unread bytes remaining in the current buffer, write a ‘1’ to RXSKIP (RXCN.1). 12.3. Timing and Buffer Overflow Considerations For 10 Base-T Ethernet, a minimum-sized packet of 64 bytes is received in 51.2 us. The maximum number of packets that can be held by the receive buffer is eight. To ensure that pointer corruption does not occur, software should disable packet reception (RXINH = 1) after the seventh packet has arrived in the receive buffer. If the ability to service the packet received interrupt is longer than 51.2us, then software should use the random access method to retrieve data from the receive buffer. The random access method described in Section 7.1 on page 23. 58 Rev. 1.0 C P2200/1 Note: The value of CPADDRH:CPADDRL may be invalid if an overflow event occurs. After an overflow, the FIFOHEADH:FIFOHEADL pointer should be used to determine the starting address of the current packet. CPLEN will always remain valid even after an overflow event. Note: If the Receive FIFO Full Interrupt is triggered, the interrupt flag must be cleared to re-enable packet reception. The Receive FIFO Full Interrupt is triggered based on the size of packets or on the number of packets. If triggered based on the number of packets, then pointer corruption has occurred. 12.4. Initializing the Receive Buffer, Filter and Hash Table After a device reset, the receive buffer is empty and the filter is configured to accept broadcast packets and multicast packets matching a hash value of 0x0400. This hash value allows PAUSE control packets to pass through the receive filter. The receive buffer does not require any additional initialization. The receive filter can be configured to accept or ignore broadcast packets, multicast packets, runt packets (Ethernet Frame smaller than 64 bytes), and packets with a CRC error. The receive filter is configured using the RXFILT register. The device can be configured to accept broadcast packets and packets addressed to the controller’s MAC address without using the hash table. If multicast packets need to be accepted, then the hash table can be programmed to accept packets addressed to specific address ranges. The CP2200/1 implements a 16-bit hash table to represent all possible addresses in the 64-bit address space. Each of the possible 65536 possible values for the hash table represent a range of MAC addresses. If all 16 bits are set to ‘1’, all multicast addresses will be accepted. If all 16-bits are set to ‘0’, then all multicast addresses will be rejected.The following procedure can be used to determine which bits to set for a specific address: Step 1: Perform a 32-bit CRC on the 6-bytes of the address using 0xC704DD7B as the polynomial. Step 2: Record the least significant 4 bits of the CRC result (Hash Index). Step 3: The Hash Index determines the bit that should be set in the hash table that will allow the address to be received. For example, if the least significant 4-bits of the CRC result are 101b (5d), then setting bit 5 of the 16-bit hash table will allow all MAC addresses whose CRC result is 5d to be accepted. Rev. 1.0 59 C P2200/1 12.5. Receive Status and Control Registers The CP2200/1 receive interface is controlled and managed through the registers in Table 16. The current packet registers provide information about the next packet to be unloaded from the receive buffer (the oldest packet received). Table 16. Receive Status and Control Register Summary Register RXCN RXSTA Long Name Receive Interface Control Receive Interface Status Address 0x11 0x12 Description Contains receive interface control bits such as RXSKIP, RXCLRV, RXRST, and RXINH. Indicates when the receive interface is busy receiving a frame and when the current packet has been completely read from the buffer. Provides an efficient method of reading entire packets sequentially from the receive buffer. Specifies the type of packets can pass through the receive filter. 16-bit Hash Table used to filter multicast packets. Specifies information about the current packet such as broadcast/multicast, CRC errors, etc. Specifies the length of the current packet in the receive buffer (in bytes). Specifies the starting address of the current packet in the receive buffer. RXAUTORD Receive AutoRead RXFILT RXHASHH RXHASHL CPINFOH CPINFOL CPLENH CPLENL CPADDRH CPADDRL Receive Filter Configuration Multicast Hash Table Current Packet Information Current Packet Length Current Packet Address 0x01 0x10 0x0E 0x0F 0x1D 0x1E 0x1F 0x20 0x21 0x22 60 Rev. 1.0 C P2200/1 Register 34. RXCN: Receive Interface Control R/W R/W R/W R/W R/W W W Bit1 W Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 — Bit4 RXINH Bit3 RXCLRV Bit2 RXSKIP RXCLEAR 00000000 0x11 Bits 7–4: UNUSED. Read = 0000b, Write = don’t care. Bit 3: RXINH: Receive Inhibit Setting this bit to ‘1’ temporarily inhibits new packet reception. If a packet is currently being received, reception will continue until the packet is received. Once set, this bit must be cleared to ‘0’ by software to resume packet reception. Bit 2: RXCLRV: Valid Bit Clear Writing a ‘1’ to this bit clears the valid bit of the current packet, freeing up the buffer for new packets. This action should only be started after all bytes of the current packet have been read (CPEND = 1). If the packet is not completely read, RXSKIP should be used to discard the remaining bytes. Bit 1: RXSKIP: Skip Current Packet Writing a ‘1’ to this bit updates discards the current packet by clearing its valid bit and advances the AutoRead buffer pointer to the beginning of the next packet. Bit 0: RXCLEAR: Receive Buffer Clear Writing a ‘1’ to this bit discards all packets in the receive buffer and resets all buffer pointers and valid bits to zero. Note: Any packets currently in the buffer will remain in memory, however, all information such as the starting address and length of each packet will be lost. Any new packets that arrive will overwrite the existing data. Register 35. RXSTA: Receive Interface Status R/W R/W R/W R/W R/W R/W R R Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 — Bit2 CPEND Bit1 RXBUSY 00000000 0x12 Bits 7–2: UNUSED. Read = 000000b, Write = don’t care. Bit 1: CPEND: Current Packet End Reached This bit is automatically cleared by hardware when the valid bit for the current packet is cleared (see RXCLRV description) or the current packet is discarded (see RXSKIP description). 0: The last byte of the current packet has not been read using the AutoRead interface. 1: The last byte of the current packet has been read using the AutoRead interface. Bit 0: RXBUSY: Receiving Packet 0: Receive interface is idle. 1: Receive interface is currently receiving a packet. Rev. 1.0 61 C P2200/1 Register 36. RXAUTORD: Receive AutoRead Data Register R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x01 Bits 7–0: RXAUTORD: Receive AutoRead Data Register Reads from this register read a single byte from the receive buffer and adjust the receive buffer pointer RXFIFOHEAD accordingly. Register 37. RXFILT: Receive Filter Configuration R/W R/W R/W R/W R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 — Bit4 IGNRUNT IGNERR IGNBCST IGNMCST 00001100 0x10 Bits 7–4: UNUSED. Read = 0000b, Write = don’t care. Bit 3: IGNRUNT: Ignore Runt Packets 0: Runt packets are not ignored. 1: Runt packets are ignored. Bit 2: IGNERR: Ignore FCS Error Packets 0: Packets with FCS error are not ignored. 1: Packets with FCS error are ignored. Bit 1: IGNBCST: Ignore Broadcast Packets 0: Broadcast packets are not ignored. 1: Broadcast packets are ignored. Bit 0: IGNMCST: Ignore Multicast Packets 0: Multicast packets are not ignored. 1: Multicast packets are ignored. Register 38. RXHASHH: Multicast Hash Table High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000100 Address: 0x0E Bits 7–0: RXHASHH: Multicast Hash Table High Byte High Byte of 16-bit multicast hash table. 62 Rev. 1.0 C P2200/1 Register 39. RXHASHL: Multicast Hash Table Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x0F Bits 7–0: RXHASHL: Multicast Hash Table Low Byte Low Byte of 16-bit multicast hash table. Register 40. CPINFOH: Current Packet Information High Byte R Bit7 R Bit6 R R R R R R Reset Value RXVALID RXVLAN RXUCF Bit5 RXPCF Bit4 RXCF Bit3 RXADATA Bit2 BCAST Bit1 MCAST Bit0 00000000 Address: 0x1D Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: RXVALID: Current packet valid 0: The current packet TLB slot is empty. 1: There is a packet in the current packet TLB slot. RXVLAN: VLAN Type Detected 0: VLAN tagged frame not detected. 1: VLAN tagged frame detected. RXUNSUP: Unsupported Control Frame 0: Unsupported control frame not detected. 1: Unsupported control frame detected. RXPCF: Pause Control Frame 0: Pause control frame not detected. 1: Pause control frame detected. RXCF: Control Frame 0: Control frame not detected. 1: Control frame detected. RXADATA: Additional Data Received 0: Normal Operation. 1: 1 to 7 additional bits of data received following receipt of the packet. BCAST: Broadcast Packet 0: Current packet is not a broadcast packet. 1: Current packet is a broadcast packet. MCAST: Multicast Packet 0: Current packet is not a multicast packet. 1: Current packet is a multicast packet. Rev. 1.0 63 C P2200/1 Register 41. CPINFOL: Current Packet Information Low Byte R R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R R Bit0 Reset Value Address: RXOK Bit7 LENGTH LENERR CRCERR Reserved Reserved RXLEN Bit1 RXDROP 00000000 0x1E Bit 7: RXOK: Receive OK 0: Receive not OK. 1: Receive OK. Bit 6: LENGTH: Length/Type Field Detection 0: The length/type field of the current packet contains the packet length. 1: The length/type field of the current packet contains the packet type. Bit 5: LENERR: Length Check Error 0: No errors detected in length field. 1: The length field does not match actual packet length. Bit 4: CRCERR: CRC Error 0: CRC check passed. 1: CRC check failed. Bits 3–2: Reserved: Read = varies. Bit 1: RXLEN: Receive Length 0: Normal Operation. 1: The data received is not long enough to form a valid packet. Bit 0: RXDROP: Packet Dropped 0: Normal operation. 1: A packet has been dropped. Register 42. CPLENH: Current Packet Length High Byte R R R R R R R R Reset Value — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 — Bit2 — Bit1 — Bit0 00000000 Address: 0x1F Bits 7–0: CPLENH: Current Packet Length High Byte High byte of the current packet length. Register 43. CPLENL: Current Packet Length Low Byte R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x20 Bits 7–0: CPLENL: Current Packet Length Low Byte Low byte of the current packet length. 64 Rev. 1.0 C P2200/1 Register 44. CPADDRH: Current Packet Address High Byte R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x21 Note: The contents of this register are invalid following a buffer overflow event. Bits 7–0: CPADDRH: Current Packet Address High Byte High byte of the current packet starting address in the receive FIFO buffer. Register 45. CPADDRL: Current Packet Address Low Byte R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x22 Note: The contents of this register are invalid following a buffer overflow event. Bits 7–0: CPADDRL: Current Packet Address Low Byte Low byte of the current packet starting address in the receive FIFO buffer. Rev. 1.0 65 C P2200/1 12.6. Advanced Receive Buffer Operation Receive buffer operation is automatically handled by hardware and does not require any assistance from the host processor. Note: The information in this section is provided for reference purposes only and will typically not be used except when debugging a problem and additional control over the receive buffer is required. Figure 18 shows a detailed block diagram of the receive buffer. As packets arrive and pass through the receive filter, they are added to the circular receive buffer at the address pointed to by the tail pointer. The FIFO tail pointer is incremented after each byte is received. As soon as a new packet arrives, the receive buffer controller searches for an unused TLB slot to store data about the received packet. If an unused TLB slot is found, it is claimed and assigned to the packet currently being received by setting the slot’s valid bit to ‘1’. A Packet Received interrupt will be generated after the entire packet is copied to the buffer. If all 8 slots are full (valid bits for all slots are set to ‘1’), then the packet will be dropped and a Receive FIFO Full interrupt will be generated. Each TLB slot holds information about its assigned packet such as starting address in the buffer, length, and information about the packet such as the type (broadcast, multicast, unicast) and any errors that occurred during reception (CRC error, incomplete packet, etc.). The receive buffer controller rotates through the TLB slots in a circular fashion. For debugging purposes, the host processor may access any TLB slot using the TLB registers listed in Table 17. Translation Look-aside Buffer (8-entry circular or random access) Copy of Current TLB CPINFO/ CPLEN/ CPADDR CPTLB Current TLB Entry Number (e.g. 0 for TLB0) FIFO Head Pointer 0 1 1 1 0 0 0 0 TLB0 TLB1 TLB2 TLB3 TLB4 TLB5 TLB6 TLB7 FIFO Tail Pointer Packet #1 Packet #2 4 KB Receive Buffer Packet #3 RXAUTORD Valid Bit Current packet address, length, and information. Autoread interface automatically manages read pointers. TLB Entries are typically not accessed by the host. Figure 18. Receive Buffer Block Diagram The oldest packet received starts at the address pointed to by the FIFO head pointer. This packet (packet #1 in Figure 18) will be referred to as the current packet. The FIFO head pointer is used by the AutoRead interface to read data from the current packet. As data is read using the AutoRead interface, the FIFO head pointer is incremented until the entire packet is read out. Once the packet is read out, the host processor must clear the valid bit of the packet by writing a ‘1’ to RXCLRV (RXCN.2). If the host processor chooses not to read the entire packet, the valid bit should be cleared (and unread data skipped) by writing a ‘1’ to RXSKIP (RXCN.1). A copy of the TLB slot associated with the current packet is always available by reading the CTLB registers listed in Table 16. The same information can be obtained by reading CPTLB to determine the current TLB slot, then directly accessing the slot using the registers in Table 17. 66 Rev. 1.0 C P2200/1 The Receive FIFO Full interrupt will be generated once all free space in the buffer is used or all TLB slots are filled. The host processor should read the RXFIFOSTA register to determine the cause of the interrupt. To receive additional packets after the buffer is filled, packets must be removed from the buffer by reading them out or discarding them. Packets can be discarded one at a time or all at once by writing ‘1’ to RXCLEAR (RXCN.0). 12.7. Receive Buffer Advanced Status and Control Registers The receive buffer is controlled and managed through the registers in Table 17. These registers are not commonly accessed by the host processor except for debug purposes. Table 17. Receive Status and Control Register Summary Register CPTLB TLBVALID TLBnINFOH TLBnINFOL TLBLENH TLBLENL TLBnADDRH TLBnADDRL RXFIFOTAILH RXFIFOTAILL Long Name Current Packet TLB Number TLB Valid Indicator TLBn Packet Information TLBn Packet Length TLBn Packet Address Receive FIFO Buffer Tail Pointer Address 0x1A 0x1C multiple multiple multiple 0x15 0x16 0x17 0x18 0x5B Description Specifies the TLB number (0–7) associated with the current packet. Indicates which TLBs currently have valid packets. Specifies information about the packet associated with TLBn (n = 0–7). Specifies the length of the packet associated with TLBn (n = 0–7). Specifies the starting address of the packet associated with TLBn (n = 0–7). Points to the byte following the last valid byte. This is where new packets are added. Points to the beginning of the current packet and is incremented with each Auto Read. Indicates the cause of the Receive FIFO Buffer Full interrupt. RXFIFOHEADH Receive FIFO Buffer Head RXFIFOHEADL Pointer RXFIFOSTA Receive FIFO Buffer Status Register 46. CPTLB: Current Packet TLB Number R/W R/W R/W R/W R/W R/W Bit2 R/W R/W Bit0 Reset Value — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 CPTLB Bit1 00000000 Address: 0x1A Bits 7–3: UNUSED. Read = 00000b; Write = don’t care. Bits 2–0: CPTLB[2:0]: Current Packet TLB Number The TLB Number (0–7) of the TLB slot associated with the current packet. Rev. 1.0 67 C P2200/1 Register 47. TLBVALID: TLB Valid Indicator R/W R/W R/W R/W R/W R/W R/W R/W Reset Value VAL7 Bit7 VAL6 Bit6 VAL5 Bit5 VAL4 Bit4 VAL3 Bit3 VAL2 Bit2 VAL1 Bit1 VAL0 Bit0 00000000 Address: 0x1C Bits 7–0: TLBVALID: TLB Valid Indicator Displays the valid bits for the eight TLB slots in a single byte. Note: This register may be used to clear multiple valid bits simultaneously. For all writes, bits with a value of ‘0’ will cause the associated valid bit to be cleared, and bits with a value of ‘1’ will be ignored. For example, writing 0xFE to this register will clear the valid bit for TLB0. Register 48. TLBnINFOH: TLBn Information High Byte R Bit7 R Bit6 R R R R R R Reset Value Reserved RXVLAN RXUCF Bit5 RXPCF Bit4 RXCF Bit3 RXADATA Bit2 BCAST Bit1 MCAST Bit0 00000000 Address: TLB0INFOH: 0x23; TLB1INFOH: 0x29; TLB2INFOH: 0x2F; TLB3INFOH: 0x35; TLB4INFOH: 0x3B; TLB5INFOH: 0x41; TLB6INFOH: 0x47; TLB7INFOH: 0x4D Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: Reserved. Read = varies; RXVLAN: VLAN Type Detected 0: VLAN tagged frame not detected. 1: VLAN tagged frame detected. RXUNSUP: Unsupported Control Frame 0: Unsupported control frame not detected. 1: Unsupported control frame detected. RXPCF: Pause Control Frame 0: Pause control frame not detected. 1: Pause control frame detected. RXCF: Control Frame 0: Control frame not detected. 1: Control frame detected. RXADATA: Additional Data Received 0: Normal Operation. 1: 1 to 7 additional bits of data received following receipt of the packet. BCAST: Broadcast Packet 0: Packet is not a broadcast packet. 1: Packet is a broadcast packet. MCAST: Multicast Packet 0: Packet is not a multicast packet. 1: Packet is a multicast packet. 68 Rev. 1.0 C P2200/1 Register 49. TLBnINFOL: TLBn Information Low Byte R R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R R Bit0 Reset Value RXOK Bit7 LENGTH LENERR CRCERR Reserved Reserved RXLEN Bit1 RXDROP 00000000 Address: TLB0INFOH: 0x24; TLB1INFOH: 0x2A; TLB2INFOH: 0x30; TLB3INFOH: 0x36; TLB4INFOH: 0x3C; TLB5INFOH: 0x42; TLB6INFOH: 0x48; TLB7INFOH: 0x4E Bit 7: RXOK: Receive OK 0: Receive not OK. 1: Receive OK. Bit 6: LENGTH: Length/Type Field Detection 0: The length/type field of the current packet contains the packet length. 1: The length/type field of the current packet contains the packet type. Bit 5: LENERR: Length Check Error 0: No errors detected in length field. 1: The length field does not match actual packet length. Bit 4: CRCERR: CRC Error 0: CRC check passed. 1: CRC check failed. Bits 3–2: Reserved: Read = varies. Bit 1: RXLEN: Receive Length 0: Normal Operation. 1: The data received is not long enough to form a valid packet. Bit 0: RXDROP: Packet Dropped 0: Normal operation. 1: A packet has been dropped. Register 50. TLBnLENH: TLBn Packet Length High Byte R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: TLB0LENH: 0x25; TLB1LENH: 0x2B; TLB2LENH: 0x31; TLB3LENH: 0x37; TLB4LENH: 0x3D; TLB5LENH: 0x43; TLB6LENH: 0x49; TLB7LENH: 0x4F Bits 7–0: TLBnLENH: TLBn Packet Length High Byte High byte of the packet length for the packet associated with TLBn. Rev. 1.0 69 C P2200/1 Register 51. TLBnLENL: TLBn Packet Length Low Byte R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: TLB0LENH: 0x26; TLB1LENH: 0x2C; TLB2LENH: 0x32; TLB3LENH: 0x38; TLB4LENH: 0x3E; TLB5LENH: 0x44; TLB6LENH: 0x4A; TLB7LENH: 0x50 Bits 7–0: TLBnLENL: TLBn Packet Length Low Byte Low byte of the packet length for the packet associated with TLBn. Register 52. TLBnADDRH: TLBn Packet Address High Byte R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Note: The contents of this register are invalid following a buffer overflow event. Address: TLB0ADDRH: 0x27; TLB1ADDRH: 0x2D; TLB2ADDRH: 0x33; TLB3ADDRH: 0x39; TLB4ADDRH: 0x3F; TLB5ADDRH: 0x45; TLB6ADDRH: 0x4B; TLB7ADDRH: 0x51 Bits 7–0: TLBnADDRH: TLBn Packet Address High Byte High byte of the packet starting address for the packet associated with TLBn. Register 53. TLBnADDRL: TLBn Packet Address Low Byte R Bit7 R Bit6 R Bit5 R Bit4 R Bit3 R Bit2 R Bit1 R Bit0 Reset Value 00000000 Note: The contents of this register are invalid following a buffer overflow event. Address: TLB0ADDRH: 0x28; TLB1ADDRH: 0x2E; TLB2ADDRH: 0x34; TLB3ADDRH: 0x3A; TLB4ADDRH: 0x40; TLB5ADDRH: 0x46; TLB6ADDRH: 0x4C; TLB7ADDRH: 0x52 Bits 7–0: TLBnADDRL: TLBn Packet Address Low Byte Low byte of the packet starting address for the packet associated with TLBn. 70 Rev. 1.0 C P2200/1 Register 54. RXFIFOHEADH: Receive FIFO Head Pointer High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x17 Bits 7–0: RXFIFOHEADH: Receive FIFO Head Pointer High Byte High byte of the receive FIFO buffer head pointer. Register 55. RXFIFOHEADL: Receive FIFO Head Pointer Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x18 Bits 7–0: RXFIFOHEADL: Receive FIFO Head Pointer Low Byte Low byte of the receive FIFO buffer head pointer. Register 56. RXFIFOTAILH: Receive FIFO Tail Pointer High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x15 Bits 7–0: RXFIFOTAILH: Receive FIFO Tail Pointer High Byte High byte of the receive FIFO buffer tail pointer. Register 57. RXFIFOTAILL: Receive FIFO Tail Pointer Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x16 Bits 7–0: RXFIFOTAILL: Receive FIFO Tail Pointer Low Byte Low byte of the receive FIFO buffer tail pointer. Rev. 1.0 71 C P2200/1 Register 58. RXFIFOSTA: Receive FIFO Status Register R/W R/W R/W R/W R/W R/W R/W Bit1 R/W Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 — Bit2 FIFOSTA1 FIFOSTA0 00000000 0x5B This register is set by hardware and is valid after an RX FIFO Full Interrupt is generated or if TLBVALID equals 0xFF. Bits 7–2: UNUSED. Read = 000000b, Write = don’t care. Bits 1–0: FIFOSTA[1:0]: Receive FIFO Status 00: Initial Value—No information. 01: The last packet successfully received used all available free space in the buffer. 10: The last packet successfully received was the 8th packet in the receive buffer. There is free space remaining in the receive buffer; however, the maximum number of packets in the buffer has been reached. Any future packets received will cause overflow. Note: Receiving an unsuccessful 9th packet will cause overflow. 11: The last packet successfully received was the eighth packet in the receive buffer and used all available free space in the buffer. 72 Rev. 1.0 C P2200/1 13. Flash Memory The CP2200/1 has 8 kB of on-chip non-volatile Flash memory fully accessible by the host processor. The last six bytes of this memory space (addresses 0x1FFA to 0x1FFF) are factory preprogrammed and contain a unique 48bit MAC Address (Individual Address) registered with the IEEE Registration Authority. The most significant byte of the MAC address is at 0x1FFA, and the least significant byte is at 0x1FFF. The last page of Flash containing the MAC address is erasable, and the user should exercise caution to prevent erasing the MAC Address. 13.1. Programming the Flash Memory The Flash memory can be programmed one byte at a time through the parallel host interface. Once cleared to a logic 0, a Flash bit must be erased to set it back to logic 1. A Flash bit may always be changed from logic 1 to logic 0, as long as Flash bytes are only written once between erase cycles. Flash erase operations erase an entire 512 byte sector at a time. Flash write and erase operations are automatically timed by hardware and do not affect the parallel host interface. After initiating a Flash write or erase operation, the host CPU can continue to access the CP2200/1 through the parallel host interface while the Flash operation is taking place. The host is notified with an interrupt request when the Flash write or erase operation is complete. Refer to Table 18 for complete Flash memory electrical characteristics including typical write and erase cycle times. The Flash memory can be written and erased using the FLASHADDRH:FLASHADDRL, FLASHDATA, and FLASHERASE registers. Once a Flash operation is initiated, the status can be monitored using the FLASHSTA register, or the host can wait for notification by the interrupt signal. 13.1.1. Flash Lock and Key Protection The Flash memory is protected from errant write and erase operations by a lock and key function. Flash reads are unrestricted. The Flash Lock and Key Register (FLASHKEY) must be written with the correct key codes, in sequence, before each Flash write or erase operation. If a Flash write or erase operation is attempted without first writing the correct key codes to the FLASHKEY register, Flash cannot be written or erased until the next reset. After programming Flash, the CP2200/1 should be reset in order to protect the device from errant Flash operations. The key codes for unlocking the CP2200/1 are 0xA5 and 0xF1. These codes must be written in sequence to the FLASHKEY register prior to each Flash write or erase operation. Note: To ensure the integrity of Flash contents, the on-chip VDD Monitor should not be disabled while the Flash memory is unlocked. 13.1.2. Flash Erase Procedure Step 1: Write 0xA5 followed by 0xF1 to FLASHKEY. Step 2: Set FLASHADDRH:FLASHADDRL to any address within the 512-byte page to be erased. Step 3: Write the value 0x01 to FLASHERASE. Step 4: Check FLASHSTA to determine when the Flash operation is complete. The Flash Write/Erase Completed interrupt can also be use to determine when the operation completes. 13.1.3. Flash Write Procedure Step 1: Write 0xA5 followed by 0xF1 to FLASHKEY. Step 2: If the byte to be written is not 0xFF, then erase the page containing the byte. Step 3: Set FLASHADDRH:FLASHADDRL to the address of the byte to be written. Step 4: Write the value to be written to the FLASHDATA register. Step 5: Check FLASHSTA to determine when the Flash operation is complete. The Flash Write/Erase Completed interrupt can also be used to determine when the operation is complete. Rev. 1.0 73 C P2200/1 13.2. Reading the Flash Memory Flash reads occur much faster than Flash write or erase operations and are completed within the minimum read strobe time specified by the parallel host interface. Flash is read using the FLASHADDRH:FLASHADDRL, FLASHDATA, and FLASHAUTORD registers. The FLASHAUTORD register provides an efficient method of accessing sequential data in Flash by automatically incrementing the Flash address pointer after each read. 13.2.1. Flash Read Procedure Step 1: Set FLASHADDRH:FLASHADDRL to the address of the byte to be read. Step 2: Read the value of the byte from FLASHDATA. 13.2.2. Multiple Byte Flash Read Procedure Step 1: Set FLASHADDRH:FLASHADDRL to the address of the first byte to be read. Step 2: For each byte, read the value from FLASHAUTORD. Table 18. Flash Electrical Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameters Flash Size Endurance Erase Cycle Time Write Cycle Time Conditions Min 8192 20k — 40 Typ — 100k 11 55 Max — — — 70 Units bytes Erase/ Write ms µs 74 Rev. 1.0 C P2200/1 13.3. Flash Access Registers The CP2200 Flash is accessed through the registers in Table 17. See the register tables following Table 17 for detailed register descriptions Table 19. Flash Access Register Summary Register FLASHSTA FLASHKEY FLASHADDRH FLASHADDRL FLASHDATA Long Name Flash Status Flash Lock and Key Flash Address Register High and Low Bytes Flash Read/Write Data Register Address 0x7B 0x67 0x69 0x68 0x06 0x05 Description Used to determine the status of a Flash write or erase operation. Write-only register allowing the host to unlock the Flash for writing or erasing. 16-bit Address used for Flash operations. Data register used for writing or reading a single byte of Flash. Data register used for reading a block of sequential data stored in Flash. Each read from this register increments the Flash address register by 1. Initiates a Flash erase operation. FLASHAUTORD Flash AutoRead Data Register FLASHERASE Flash Erase 0x6A Register 59. FLASHSTA: Flash Status Register R/W R/W R/W R/W R Bit3 R Bit2 R Bit1 R Bit0 Reset Value Address: — Bit7 — Bit6 — Bit5 — Bit4 FLBUSY Reserved FLWRITE FLERASE 00000000 0x7B Note: To determine when a Flash operation completes, the FLBUSY bit should be polled or software should wait for the Flash Write/Erase Operation Complete Interrupt to occur. Bits 7–4: UNUSED. Read = 0000b, Write = don’t care. Bit 3: FLBUSY: FLASH Busy Indicator This bit indicates when a FLASH write or erase operation is in progress. 0: FLASH is idle. 1: FLASH write/erase operation is currently in progress. Bit 2: Reserved. Bit 1: FLWRITE: FLASH Write 0: The last Flash operation completed was not a Flash write. 1: The last Flash operation completed was a Flash write. Bit 0: FLERASE: FLASH Erase 0: The last Flash operation completed was not a Flash erase. 1: The last Flash operation completed was a Flash erase. Rev. 1.0 75 C P2200/1 Register 60. FLASHKEY: FLASH Lock and Key Register R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x67 Bits 7-0: FLKEY: Flash Lock and Key Register This register must be written to unlock the Flash for writing or erasing. To unlock the Flash, first write 0xA5 and then 0xF1 to this register. The VDD Monitor should not be disabled while the Flash is unlocked. The device must be unlocked prior to each Flash write/erase operation. Register 61. FLASHADDRH: FLASH Address Register High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x69 Bits7–0: FLASHADDRH: Flash Address Register High Byte Holds the most significant eight bits of the target FLASH address. Register 62. FLASHADDRL: FLASH Address Register Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x68 Bits7–0: FLASHADDRL: Flash Address Register Low Byte Holds the least significant eight bits of the target FLASH address. 76 Rev. 1.0 C P2200/1 Register 63. FLASHDATA: FLASH Read/Write Data Register R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x06 Bits7–0: FLASHDATA: Flash Read/Write Data Register Read: Value of the Flash byte at the location specified by FLASHADDRH:FLASHADDRL. Write: Initiates a Flash write operation to the Flash byte at the address in FLASHADDRH:FLASHADDRL. The Flash memory must be unlocked, and the target Flash byte should have a value of 0xFF (value of erased Flash). Register 64. FLASHAUTORD: FLASH AutoRead Data Register R Bit7 R Bit6 R Bit5 R Bit4 R B R Bit2 R Bit1 R Bit0 Reset Value 00000000 Address: 0x05 Bits7–0: FLASHAUTORD: Flash AutoRead Data Register Reads from this register return the value of the Flash byte at the location specified by the Flash Address Register. The Flash Address Register is automatically incremented by 1 after the read. Register 65. FLASHERASE: FLASH Erase Register R/W R/W R/W R/W R/W R/W R/W R/W Reset Value — Bit7 — Bit6 — Bit5 — Bit4 — Bit3 — Bit2 Reserved Bit1 FLEGO Bit0 00000000 Address: 0x6A Bits 7–2: UNUSED. Read = 000000b, Write = don’t care. Bit 1: Reserved. Must write 0b. Bit 0: FLEGO: Flash Erase Start. Writing a ‘1’ to this bit initiates a Flash erase operation on the 512-byte page of Flash containing the Flash byte at the location specified in the Flash Address Register. The Flash memory must be unlocked prior to starting a Flash erase operation. Rev. 1.0 77 C P2200/1 14. Media Access Controller (MAC) The CP2200/1 has an IEEE 802.3 compliant Ethernet Media Access Controller (MAC). The MAC can be configured to automatically pad short frames (full duplex mode only), append CRC, and perform frame length checking. A loopback mode separate from PHY loopback is also provided for system debugging. The MAC is configured through nine indirect 16-bit registers summarized in Table 20. 14.1. Initializing the MAC MAC initialization occurs after the physical layer initialization and typically occurs once after each reset or AutoNegotiation Complete interrupt. Most MAC indirect registers can be left at their reset values. See “6.2. Reset Initialization” on page 18 for the complete reset initialization procedure. The following are the steps required to initialize the MAC: Step 1: Determine if the physical layer is set to full-duplex or half-duplex. The MAC must be set to the same duplex mode as the physical layer before sending or receiving any packets. Step 2: Write 0x40B3 (full-duplex) or 0x4012 (half-duplex) to MACCF. The appropriate bits in this register may also be set or cleared to change padding options or MAC behavior. Step 3: Write 0x0015 (full-duplex) or 0x0012 (half-duplex) to IPGT. Step 4: Write 0x0C12 to IPGR. Step 5: Write 0x05EE to MAXLEN. Step 6: Program the 48-bit Ethernet MAC Address by writing to MACAD0:MACAD1:MACAD2. Step 7: Write 0x0001 to MACCN to enable reception. If loopback mode or flow control is desired, set the appropriate bits to enable these functions. 14.2. Accessing the Indirect MAC Registers The indirect MAC registers are accessed through four direct mapped registers: MACADDR, MACDATAH, MACDATAL, and MACRW. The MAC registers can be accessed using the following procedure: Step 1: Write the address of the indirect register to MACADDR. Step 2: If writing a value to the indirect register, write a 16-bit value to MACDATAH:MACDATAL. Step 3: Write any value to MACRW to transfer the contents of MACDATAH:MACDATAL to the indirect register. Step 4: Perform a read on MACRW to transfer the contents of the indirect register to MACDATAH:MACDATAL. The MACDATAH and MACDATAL registers may now be directly read to determine the contents of the indirect register. 78 Rev. 1.0 C P2200/1 Register 66. MACADDR: MAC Indirect Address R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x0A Bits 7–0: MACADDR: MAC Indirect Address Indirect MAC register address targeted by reads/writes to MACRW. Register 67. MACDATAH: MAC Data High Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x0B Bits 7–0: MAC Data High Byte Holds the most significant 8-bits of data read or written to an indirect MAC register. Register 68. MACDATAL: MAC Data Low Byte R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x0C Bits 7–0: MAC Data Low Byte Holds the least significant 8-bits of data read or written to an indirect MAC register. Register 69. MACRW: MAC Read/Write Initiate R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value 00000000 Address: 0x0D Bits 7–0: MAC Read/Write Initiate Initiates a read or write to the indirect MAC register at the address stored in MACADDR. Write: The contents of MACDATAH:MACDATAL are transferred to the target MAC register. Read: The contents of the target MAC register are transferred to MACDATAH:MACDATAL. Rev. 1.0 79 C P2200/1 14.3. Indirect MAC Register Descriptions The MAC is configured through nine indirect 16-bit registers listed in Table 20. See the figures following Table 20 for detailed register descriptions. Table 20. Indirect MAC Register Summary Register MACCN MACCF IPGT IPGR CWMAXR MAXLEN MACAD0 MACAD1 MACAD2 Long Name MAC Control MAC Configuration Back-to-Back Interpacket Delay Non-Back-to-Back Interpacket Delay Collision Window and Maximum Retransmit Maximum Frame Length MAC Address Address 0x00 0x01 0x02 0x03 0x04 0x05 0x10 0x11 0x12 Description Used to enable reception and other options. Used to configure padding options and other settings. Sets the Back-to-Back Interpacket Delay. Sets the Non-Back-to-Back Interpacket Delay. Sets the collision window size and the maximum number of retransmits allowed. Sets the maximum receive frame length. Sets the MAC address of the local device. 80 Rev. 1.0 C P2200/1 Indirect Register 1. MACCN: MAC Control Register R/W Bit15 R/W Bit14 R/W Bit13 R/W Bit12 R/W Bit11 R/W Bit10 R/W Bit9 R/W Bit8 Reserved RANDRST Reserved R/W Bit7 R/W R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Default Value Reserved Bit6 LOOPBCK TXPAUSE RXPAUSE Reserved RCVEN Bit0 0x8000 MACADDR: 0x00 Reserved. Read = varies; Must write 0b. RANDRST: Random Number Generator Reset Writing a ‘1’ to this bit resets the random number generator within the transmit function. Bits 13–5:Reserved. Read = varies; Must write 000000000b. Bit 4: LOOPBCK: Loopback Mode Enable Bit Note: MAC Loopback Mode is independent of the physical layer loopback mode. 0: Normal operation. 1: MAC transmit data is internally looped back as MAC receive data. Bit 3: TXPAUSE: TX Flow Control Enable Bit (Full-Duplex Only) 0: PAUSE control frames are blocked. 1: PAUSE control frames are allowed to pass through the MAC. Bit 2: RXPAUSE: RX Flow Control Enable Bit (Full-Duplex Only) 0: PAUSE control frames received from the physical layer are ignored. 1: PAUSE control frames received from the physical layer are acted upon. Bit 1: Reserved. Read = 0; Must write 0b. Bit 0: RCVEN: Receive Enable 0: The MAC blocks control frames from reaching the receive interface. The MAC blocks all received packets from the receive interface. 1: The MAC allows received packets to reach the receive interface. Bit 15: Bit 14: Rev. 1.0 81 C P2200/1 Indirect Register 2. MACCF: MAC Configuration Register R/W Bit15 R/W Bit14 R/W R/W R/W Bit11 R/W Bit10 R/W R/W Reserved ABORTD EBBPD Bit13 EBD Bit12 Reserved RLPRE Bit9 PUREPRE Bit8 R/W Bit7 R/W Bit6 R/W R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Default Value PADMD1 PADMD0 PADEN Bit5 CRCEN PHEADER Reserved LENCHK FLLDPLX 0x0000 MACADDR: 0x01 Reserved. Read = 0b; Must write 0b. ABORTD: Abort Disable Bit 0: MAC will abort when excessive delay is detected and update the transmit status vector. 1: MAC will attempt to transmit indefinitely as specified in IEEE 802.3. Bit 13: EBBPD: Exponential Backoff after Back Pressure Disable Bit (Half-Duplex Only) 0: After incidentally causing a collision during back pressure, the MAC will use the exponential backoff algorithm as specified in IEEE 802.3. 1: After incidentally causing a collision during back pressure, the MAC will immediately transmit without using the exponential backoff algorithm. Bit 12: EBD: Exponential Backoff Disable (Half-Duplex Only) 0: MAC will use the exponential backoff algorithm as specified in IEEE 802.3. 1: MAC will immediately retransmit following a collision. Bits 11–10:Reserved. Read = 00b; Write = don’t care. Bit 9: RLPRE: Reject Long Preamble 0: MAC allows any length preamble as specified in IEEE 802.3. 1: MAC rejects packets with a preamble greater than 12 bytes in length. Bit 8: PUREPRE: Pure Preamble Enforcement 0: No preamble checking is performed. 1: MAC will verify the content of the preamble to ensure it contains 0x55 and is error-free. Packets with an invalid preamble will be rejected. Bit 7–6: PADMD[1:0]: Pad Mode Note: This bit field is ignored if PADEN is cleared to ‘0’. See Table 21 for a complete description. Bit 5: PADEN: Pad Enable Bit (must be set to 0 in half-duplex operation) Note: See Table 21 for a complete description. Bit 4: CRCEN: CRC Enable Bit Note: This bit must be set to ‘1’ if padding is enabled. 0: CRC will not be appended. Frames presented to the MAC must contain CRC. 1: CRC will be appended. Bit 15: Bit 14: 82 Rev. 1.0 C P2200/1 Indirect Register 2. MACCF: MAC Configuration Register (Continued) Table 21. Pad Operation PADMD1[7] PADMD0[6] PADEN[5] CRCEN[4] x x 0 x 1 x x 0 1 0 0 0 1 1 1 0 1 1 1 1 Action No padding added on transmitted packets, check CRC No padding added on transmitted packets, append CRC Pad short frames to 60 bytes, append CRC Pad short frames to 64 bytes, append CRC Auto Detect Tagged VLAN Frames (IEEE802.1q) If untagged: Pad to 60 bytes, append CRC If tagged: Pad to 64 bytes, append CRC Bit 3: Bit 2: Bit 1: Bit 0: PHEADER: Proprietary Header Select Bit 0: No proprietary header exists on the front of IEEE 802.3 frames. 1: Four bytes of proprietary header information exist on the front of IEEE 802.3 frames. These bytes will be ignored by the CRC function. Reserved. Read = 0b; Must write 0b. LENCHK: Frame Length Checking Enable Bit 0: Frame length checking is disabled. 1: Transmit and receive frame lengths are compared to the Length/Type field. If the Length/Type field represents a length then the check is performed. Mismatches are reported in the Transmit/ Receive status vectors. FLLDPLX: Full-Duplex Mode Enable Bit 0: MAC operates in half-duplex mode. 1: MAC operates in full-duplex mode. Rev. 1.0 83 C P2200/1 Indirect Register 3. IPGT: Back-to-Back Inter-Packet Gap Register R/W Bit15 R/W Bit14 R/W Bit13 R/W Bit12 R/W Bit11 R/W Bit10 R/W Bit9 R/W Bit8 Reserved R/W R/W Bit6 R/W Bit5 R/W Bit4 R/W R/W Bit2 R/W Bit1 R/W Bit0 Default Value Reserved Bit7 IPGT Bit3 0x0000 MACADDR: 0x02 Bits 15–7:Reserved. Read = 000000000b; Must write 000000000b. Bits 6–0: IPGT: Back-to-Back Inter-Packet Gap Register Sets the minimum delay between the end of any transmitted packet and the start of a new packet. In Full-Duplex mode, the register value should be set to the desired number of time units (each time unit is 0.46 µs) minus 3. The recommended setting is 0x15 (21d), which yields 9.6 µs. In Half-Duplex mode, the register value should be set to the desired number of time units (each time unit is 0.46 µs) minus 6. The recommended setting is 0x12 (18d), which yields 9.6 µs. Indirect Register 4. IPGR: Non-Back-to-Back Inter-Packet Gap Register R/W R/W Bit14 R/W Bit13 R/W Bit12 R/W R/W Bit10 R/W Bit9 R/W Bit8 Reserved Bit15 IPGR1 Bit11 R/W R/W Bit6 R/W Bit5 R/W Bit4 R/W R/W Bit2 R/W Bit1 R/W Bit0 Default Value Reserved Bit7 IPGR2 Bit3 0x0000 MACADDR: 0x03 Bit 15: Reserved. Read = 0b; Must write 0b. Bits 14–8:IPGR1: Non-Back-to-Back Inter-Packet Gap Part 1 Sets the optional carrier sense window referenced in IEEE 802.3 Section 4.2.3.2.1. The range of values for this bit field are 0x00 to IPGR2. The recommended value is 0x0C. Bit 7: Reserved. Read = 0b; Must write 0b. Bits 6–0: IPGR2: Non-Back-to-Back Inter-Packet Gap Part 2 Sets the Non-Back-to-Back Inter-Packet Gap. The recommended value is 0x12, which represents a minimum inter-packet gap of 9.6 µs. 84 Rev. 1.0 C P2200/1 Indirect Register 5. CWMAXR: Collision Window and Maximum Retransmit Register R/W Bit15 R/W Bit14 R/W Bit13 R/W Bit12 R/W R/W R/W Bit9 R/W Bit8 Reserved Bit11 CW Bit10 R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W R/W R/W Bit0 Default Value Reserved Bit2 MAXR Bit1 0x370F MACADDR: 0x04 Note: This register does not require initialization and will be left at its reset value by most systems. Bits 15–14:Reserved. Read = 00b; Must write 00b. Bits 13–8:CW: Collision Window Sets the collision window in which collisions occur in a properly configured network. The collision window is specified in the number of bytes from the start of transmission. The preamble and frame delimiter are included in the byte count. Its default of 0x37 corresponds to the count of frame bytes at the end of the window. Bits 7–4: Reserved. Read = 0000b; Must write 0000b. Bits 3–0: MAXR: Maximum Retransmit Attempts Sets the maximum number of retransmit attempts following a collision before aborting the packet due to excessive collisions. IEEE 802.3 specifies a maximum value of 0x0F (15d). Indirect Register 6. MAXLEN: Maximum Frame Length Register R/W Bit15 R/W Bit14 R/W Bit13 R/W Bit12 R/W Bit11 R/W Bit10 R/W Bit9 R/W Bit8 R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Default Value 0x0600 MACADDR: 0x05 Note: This register does not require initialization and will be left at its reset value will be set to 1518 (0x05EE) by most systems. Bits 15–0:MAXF: Maximum Frame Length Specifies the maximum length of a receive frame. The default value is 0x600 (1536 octets). This register should be programmed if a shorter maximum length restriction is desired. Examples of shorter frame lengths are untagged (1518 octets) and tagged (1522 octets). If a proprietary header is allowed, this field should be adjusted accordingly. Rev. 1.0 85 C P2200/1 Indirect Register 7. MACAD0: MAC Address 0 R/W Bit15 R/W Bit14 R/W Bit13 R/W Bit12 R/W Bit11 R/W Bit10 R/W Bit9 R/W Bit8 OCTET6 R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Default Value OCTET5 0x0000 MACADDR: 0x10 Bits 15–8:OCTET6: MAC Address, 6th Octet This field holds the sixth (least significant) octet of the MAC address. Bits 7–0: OCTET5: MAC Address, 5th Octet This field holds the fifth octet of the MAC address. Indirect Register 8. MACAD1: MAC Address 1 R/W Bit15 R/W Bit14 R/W Bit13 R/W Bit12 R/W Bit11 R/W Bit10 R/W Bit9 R/W Bit8 OCTET4 R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Default Value OCTET3 0x0000 MACADDR: 0x11 Bits 15–8:OCTET4: MAC Address, 4th Octet This field holds the fourth octet of the MAC address. Bits 7–0: OCTET3: MAC Address, 3rd Octet This field holds the third octet of the MAC address. 86 Rev. 1.0 C P2200/1 Indirect Register 9. MACAD2: MAC Address 2 R/W Bit15 R/W Bit14 R/W Bit13 R/W Bit12 R/W Bit11 R/W Bit10 R/W Bit9 R/W Bit8 OCTET2 R/W Bit7 R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Default Value OCTET1 0x0000 MACADDR: 0x12 Bits 15–8:OCTET2: MAC Address, 2nd Octet This field holds the second octet of the MAC address. Bits 7–0: OCTET1: MAC Address, first Octet This field holds the first (most significant) octet of the MAC address. Rev. 1.0 87 C P2200/1 15. Physical Layer (PHY) The CP2200/1 has an IEEE 802.3 compliant 10 BASE-T Ethernet physical layer transceiver that includes a receiver, transmitter, auto-negotiation, loopback, jabber, smart squelch, polarity correction, and link integrity functions. If enabled, the auto-negotiation function automatically negotiates the speed of the data link and the duplex mode. Both half-duplex and full-duplex modes are supported. The physical layer is controlled and monitored through three registers: PHYCN, PHYCF, and PHYSTA. The various functions and test modes that can be enabled and monitored through these registers are explained in the following sections. 15.1. Auto-Negotiation and Duplex Mode Auto-negotiation allows the CP2200/1 to be connected to any 10/100/1000 BASE-T Ethernet network and advertise its capabilities. Auto-negotiation uses a series of fast link pulses to send 16-bit link code words. Many conditions (e.g., failure to detect fast link pulses) can cause auto-negotiation to fail. On failure, the Auto-Negotiation Failed interrupt will be generated, and/or the Auto-Negotiation Complete Interrupt will not be generated. The PHYSTA status register will indicate the cause of failure, and the physical layer will default to half-duplex mode. On success, the Auto-Negotiation Complete interrupt will be generated, and the Auto-Negotiation Failed interrupt will not be generated. Both interrupts must be checked to ensure that Auto-Negotiation has succeeded. The advertised link speed will always be 10BASE-T. The duplex mode (half or full) will be negotiated, and full duplex will be selected if supported by the network. Full duplex mode allows the physical layer to send and receive data at the same time. In half duplex mode, data can only be transmitted or received at any given time. Full duplex mode provides overall higher performance and reduces collisions. Software may also choose to advertise its ability to send and receive PAUSE control packets by setting ADPAUSE (PHYCF.2) to ‘1’. Important Note: When using auto-negotiation, the auto-negotiation enable bit AUTONEG (PHYCF.4) must be set to ‘1’ prior to enabling the physical layer. To restart auto-negotiation, the physical layer (transmitter, receiver, or both) must be disabled and reenabled. Important Note: The CP220x supports legacy link partners that cannot auto-negotiate. If the link partner cannot autonegotiate, then the physical layer will default to half-duplex mode. 15.2. Auto-Negotiation Synchronization The CP220x implements an autonegotiation scheme where autonegotiation is attempted for 250 ms, then a breaklink delay of 1.5 seconds is inserted between auto-negotiation attempts. When the break-link delay is active, the CP220x does not listen for incoming auto-negotiation requests and does not attempt to auto-negotiate. If one device starts autonegotiation while the other device is in its “break-link period”, the autonegotiation attempt will fail. If the devices are unsyncronized, this can lead to a situation where each device attempts to autonegotiate in the other device’s “break-link period”. This can be solved by synchronizing one or both devices using the following procedure: Step 1: Disable the physical layer by writing 0x00 to the PHYCN register. Step 2: Enable the physical layer with link integrity test and auto-negotiation turned off. 1.Disable the transmitter power save mode (TXPWR = 0x80) and set physical layer options (PHYCF = SMSQ | JABBER | ADPAUSE | AUTOPOL). 2.Enable the physical layer (PHYEN = 1). 3.Wait for the physical layer to power up. See Physical Layer Startup Time in Table 22 on page 93. 4.Enable the transmitter and receiver (TXEN = 1 and RXEN = 1). Step 3: Poll the Wake-on-LAN interrupt flag (WAKEINT) to detect if a link partner is present. 1.If there is a signal, wait 250 ms then begin autonegotiation. 2.If there is no signal, wait 1.5 seconds then begin autonegotiation. 88 Rev. 1.0 C P2200/1 15.3. Loopback Mode Loopback Mode provides the ability to transfer data from the physical layer’s output directly to it’s input to aid in system debugging. When PHYCN.3 is set to ‘1’, transmit data is looped back to the receiver via an internal analog path. The transmit drivers and receive input circuitry are bypassed, isolating the device from the network. This prevents network traffic from affecting the result of any system self-tests and guarantees a collision-free environment. 15.4. Link Integrity Function The Link Integrity function provides the ability to detect and respond to a 10 BASE-T link failure. When such a failure is detected, the transmitter and receiver are automatically disabled, and the state of the link is reported in LINKSTA (PHYCN.0). The host can disable the link integrity function by clearing LINKINT (PHYCF.6) to ‘0’. When the link integrity function is disabled, the physical layer will operate regardless of the presence of link pulses. 15.5. Receiver Smart Squelch and Automatic Polarity Correction The physical layer receiver can detect and correct for noise or incorrect polarity of the received signal. If the receiver Smart Squelch feature is enabled by setting SMSQ (PHYCF.7) to ‘1’, the receiver circuitry performs a combination of amplitude and timing measurements (in accordance with IEEE 802.3) to determine the validity of received data. This prevents noise from falsely triggering the receiver in the absence of valid data. Automatic polarity correction can automatically detect and correct the polarity of the received data to compensate for a wiring error at either end of the 10 BASE-T cable. When automatic polarity correction is enabled by setting AUTOPOL (PHYCF.1) to ‘1’, the polarity of the receive data is indicated in POLREV (PHYCN.1). When automatic polarity detection is disabled, the polarity of the receive data can be manually reversed by setting REVPOL (PHYCF.0) to ‘1’. 15.6. Transmitter Jabber Function Provides the ability to automatically disable the transmitter if software attempts to transmit a packet longer than the maximum allowed packet length (per IEEE 802.3). The host processor will be notified via the Jabber Detected Interrupt if a jabber condition is automatically handled by the hardware. Enabling the jabber function is recommended to ensure that the embedded system using the CP2200/1 for Ethernet communication does not generate a jabber condition on the wire. Rev. 1.0 89 C P2200/1 15.7. Initializing the Physical Layer The physical layer should be configured to the desired mode prior to setting the enable bit PHYEN (PHYCN.7). The following procedure should be used to initialize the physical layer: Step 1: If auto-negotiation is used, implement the synchronization procedure in Section 15.2 on page 88. Step 2: Disable the physical layer by writing 0x00 to the PHYCN register. Step 3: Configure Desired Options using the PHYCN and PHYCF registers: 1.Specify the Duplex Mode or enable Auto-Negotiation. 2.Enable or Disable Loopback Mode. 3.Disable the transmitter power save mode (TXPWR = 0x80). 4.Enable the desired functions such as Receiver Smart Squelch, Automatic Polarity Correction, Link Integrity, Jabber Protection, and PAUSE packet capability advertisement. 5.If Automatic Polarity Correction is disabled, manually set the desired polarity. Step 4: Enable the physical layer: 1.Enable the physical layer (PHYEN = 1). 2.Wait for the physical layer to power up. See Physical Layer Startup Time in Table 22 on page 93. 3.Enable the transmitter and receiver (TXEN = 1 and RXEN = 1). Step 5: Wait for auto-negotiation to complete. If auto-negotiation is not enabled, software may wait for a valid link or go directly to MAC Initialization. Step 6: Enable the desired Activity, Link, or Activity/Link LEDs using the Register 15, “IOPWR: Port Input/ Output Power Register,” on page 45. Step 7: Initialize the MAC to the same duplex mode reported by the physical layer in the PHYCN register. Note: Step 6 and Step 7 are repeated in the reset initialization procedure. Software only needs to perform these steps once. 90 Rev. 1.0 C P2200/1 Register 70. PHYCN: Physical Layer Control Register R/W R/W R/W R/W or RO R/W R R R Reset Value PHYEN Bit7 TXEN Bit6 RXEN Bit5 DPLXMD Bit4 LBMD Bit3 LPRFAULT Bit2 POLREV Bit1 LINKSTA Bit0 00000000 Address: 0x78 Important Note: When using auto-negotiation, the auto-negotiation enable bit, AUTONEG (PHYCF.4), must be set to “1” prior to setting PHYEN, TXEN, and RXEN to 1. To restart auto-negotiation, clear one of the three enable bits (PHYEN, TXEN, and RXEN) to “0” then set it back to “1”. Bit 7: Bit 6: PHYEN: Physical Layer Enable 0: The physical layer is placed in a low-power state with limited functionality. 1: The physical layer is placed in a normal power state and is fully functional. TXEN: Transmitter Enable 0: Physical Layer’s transmitter is placed in a low-power state. Packet transmission and Link Pulse Generation Functions are disabled. 1. Physical layer’s transmitter is enabled. RXEN: Receiver Enable 0: Physical layer’s receiver is placed in a low-power state. Packet reception is disabled. 1: Physical layer’s receiver is enabled. DPLXMD: Full-duplex Mode Enable Bit Note: This bit is read-only when Auto-Negotiation is enabled. 0: Half-duplex mode is selected. 1: Full-duplex mode is selected. LBMD: Loopback Mode Enable Bit Note: Loopback mode is automatically disabled if a jabber condition is detected. 0: Loopback mode is disabled. 1: Loopback mode is enabled. LPRFAULT: Link Partner Remote Fault (Local Fault) Indicator 0: Normal operation. 1: The link partner has detected a link fault and has sent notification during auto-negotiation. This condition can occur if the local transmitter is disabled and link pulses are no longer generated. POLREV: Polarity Reversed Indicator 0: Incorrect link polarity has not been detected. 1: Incorrect link polarity detected. Link polarity has been automatically reversed. LINKSTA: Link Status Indicator 0: Link is bad. 1: Link is good. Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: Rev. 1.0 91 C P2200/1 Register 71. PHYCF: Physical Layer Configuration Register R/W R/W Bit6 R/W Bit5 R/W Bit4 R/W Bit3 R/W Bit2 R/W Bit1 R/W Bit0 Reset Value Address: SMSQ Bit7 LINKINTG JABBER AUTONEG Reserved ADPAUSE AUTOPOL REVPOL 00000000 0x79 Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: SMSQ: Receiver Smart Squelch Enable Bit 0: Receiver Smart Squelch is disabled. 1: Receiver Smart Squelch is enabled. LINKINT: Link Integrity Function Enable Bit Note: When enabled, the link integrity function will automatically disable the transmitter and receiver and update LINKSTA (PHYCN.0) if a link failure is detected. 0: Link integrity function is disabled. 1. Link integrity function is enabled. JABBER: Jabber Protection Function Enable Bit Note: When enabled, the jabber protection function will automatically disable loopback mode if a jabber condition is detected. 0: Jabber protection function is disabled. 1: Jabber protection function is enabled. AUTONEG: Auto-Negotiation Enable Bit 0: Auto-Negotiation function is disabled. 1: Auto-Negotiation function is enabled. Reserved. Read = 0b; Must write 0b. ADPAUSE: Advertise Pause Packet Capability 0: Indicates (during auto-negotiation) that the CP2200/01 does not have pause packet capability. 1: Indicates (during auto-negotiation) that the CP2200/01 does have pause packet capability. AUTOPOL: Automatic Polarity Correction Enable Bit 0: Automatic receiver polarity correction is disabled. 1: Automatic receiver polarity correction is enabled. REVPOL: Polarity Reversal Bit Note: This bit is ignored if Automatic Polarity Correction is enabled. 0: The receiver polarity is normal. 1: The receiver polarity is reversed. 92 Rev. 1.0 C P2200/1 Register 72. PHYSTA: Physical Layer Status Register R R R R Bit4 R Bit3 R R Bit1 R Bit0 Reset Value Address: LGCILF Bit7 LGCLSF Bit6 AKDLF Bit5 AKDAMF AKDCMF ABDLF Bit2 ABDAKMF ABDABMF 00000000 0x80 Note: The Auto-Negotiation states and error types are described in Clause 28 of IEEE 802.3. Bit 7: Bit 6: Bit 5: Bit 4: Bit 3: Bit 2: Bit 1: Bit 0: LGCILF: Link Good Check Incompatible Link Failure 0: Normal operation. 1: Auto-negotiation failed due to an incompatible link. LGCLSF: Link Good Check Line Status Failure 0: Normal operation. 1. Auto-negotiation failed due to a link fault. AKDLF: Acknowledge Detect Link Failure 0: Normal operation. 1: Auto-negotiation failed due to lack of reception of fast link pulses. AKDAMF: Acknowledge Detect Acknowledge Match Failure 0: Normal operation. 1: Auto-negotiation failed due to reception of a link code word with the ACK bit cleared. AKDCMF: Acknowledge Detect Consistency Match Failure 0: Normal operation. 1: Auto-negotiation failed due to reception of inconsistent link code words. ABDLF: Ability Detect Link Failure 0: Normal operation. 1: Auto-negotiation failed due to lack of reception of fast link pulses. ABDAKMF: Ability Detect Acknowledge Match Failure 0: Normal operation. 1: Auto-negotiation failed due to the reception of link code word(s) with the ACK bit set. ABDABMF: Ability Detect Ability Match Failure 0: Normal operation. 1: Auto-negotiation failed due to the lack of reception of three consecutive link code words. Table 22. 10BASE-T Interface DC Electrical Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Parameters Transmitter Differential Output Voltage (Peak) Receiver Normal Squelch Level (Peak) Receiver Low Squelch Level Physical Layer Startup Time Conditions Min 2.2 — — — Typ 2.5 585 330 1 Max 2.8 — — — UNITS V mV mV ms Rev. 1.0 93 C P2200/1 Table 23. 10BASE-T Transmit Switching Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Symbol TTXJIT TTXHLD TTXRET Parameters TX Pair Jitter into 100 Ω Load TX Pair Positive Hold time at End of Packet TX Pair Return to < 50 mV after Last Positive Transition Min — — — Typ 1 200 210 Max — — — UNITS ns ns ns Table 24. 10BASE-T Receive Switching Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Symbol TRXJIT TCSA TIPB TCSD Description Allowable Received Jitter Carrier Sense Assertion Delay Invalid Preamble Bits after Assertion of Carrier Sense Carrier Sense Deassertion Delay Min — — 2 — Typ — 400 — 200 Max UNITS ns ns bits ns ±13.5 — 2 — T TX ± T TXHLD ... T 50mV TXJIT Figure 19. 10BASE-T Transmit TXRET Carrier Sense (internal) T RX ± T CSA T IPB T CSD ... ... RXJIT Figure 20. 10BASE-T Receive 94 Rev. 1.0 C P2200/1 Transmit Link Integrity T TX ± TXLP1 T TXLP2 ... ... ... T Receive Link Integrity LINK (LED Driver) T RX ± LPLED TXLPW T RXLP1 ... ... ... Figure 21. 10BASE-T Link Integrity Table 25. 10BASE-T Link Integrity Switching Characteristics VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified. Symbol TTXLP1 TTXLP2 TTXLPW TRXLP1 TLPLED Description First Transmitted Link Pulse after Last Transmitted Packet Time Between Transmitted Link Pulses Width of Transmitted Link Pulses Received Link Pulse Separation Last Receive Activity to Link Fail Min — — 80 8 — Typ 16 16 100 — 150 Max — — 210 24 — UNITS ms ms ns ms ms Rev. 1.0 95 C P2200/1 16. Parallel Interface The CP2200/1 has an 8-bit parallel host interface used to access the direct registers on the device. The parallel interface supports multiplexed or non-multiplexed operation using the Intel® or Motorola® bus format. The MUXEN pin can be driven high to place the device in multiplexed operation or driven low to select non-multiplexed operation. The MOTEN pin can be driven high to place the device in Motorola bus format or driven low to place the device in Intel bus format. Notes: 1. The CP2201 (28-pin package) can only be used in multiplexed mode. 2. The PCB traces connecting RD, WR, CS, ALE, and all address and data lines should be matched such that the propagation delay does not vary by more than 5 ns between any two signals. A parallel interface read or write operation typically requires 260 ns (non-multiplexed) or 300 ns (multiplexed) to transfer one byte of data. If back-to-back operations are scheduled on a non-multiplexed bus, data rates up to 30 Mbps can be achieved. Tables 26 through 29 provide detailed information about bus timing in each mode. 16.1. Non-Multiplexed Intel Format A[7:0] Valid Address T T RD AS AHR T RD T HOLD T D[7:0] VD1 T VD2 Valid Data Notes: 1. CS must be asserted with or before RD. 2. WR must remain de-asserted during a READ. Figure 22. Nonmuxed Intel READ A[7:0] Valid Address T T AS AHW T WR T HOLD WR T D[7:0] DS T DH Valid Data Notes: 1. CS must be asserted with or before WR. 2. RD must remain de-asserted during a WRITE. 96 Rev. 1.0 C P2200/1 Figure 23. Nonmuxed Intel WRITE Table 26. Non-Multiplexed Intel Mode AC Parameters Symbol TAS TRD TVD1 TVD2 TWR TDS TDH TAHR TAHW THOLD Description Address Setup Time (Read/Write) RD Low Pulse Width (Read) RD Falling to Valid Data Out (Read) RD Rising to Data Bus Tri-State (Read) WR Low Pulse Width (Write) Data Setup Time (Write) Data Hold Time (Write) Address Hold Time (Read) Address Hold Time (Write) Hold Delay (Read/Write) Min 30 160 — — 120 40 20 30 30 60 Typ — — — 60 — — — — — — Max — — 140 — — — — — — — UNITS ns ns ns ns ns ns ns ns ns ns Rev. 1.0 97 C P2200/1 16.2. Multiplexed Intel Format T ALE T AD[7:0] T T T ALE1 T ALE2 AS AH VD1 VD2 Valid Address T Valid Data T RD HOLD RD Notes: 1. CS must be asserted with or before RD. 2. WR must remain de-asserted during a READ. Figure 24. Multiplexed Intel READ T ALE T AD[7:0] T T T T ALE1 ALE2 AS AH DS DH Valid Address T Valid Data T WR HOLD WR Notes: 1. CS must be asserted with or before WR 2. RD must remain de-asserted during a WRITE. Figure 25. Multiplexed Intel WRITE 98 Rev. 1.0 C P2200/1 Table 27. Multiplexed Intel Mode AC Parameters Parameter TALE1 TALE2 TAS TAH TRD TVD1 TVD2 TWR TDS TDH THOLD Description ALE High Pulse Width ALE Falling to RD/WR Falling Address Setup Time (Read/Write) Address Hold Time (Read/Write) RD Low Pulse Width RD Falling to Valid Data Out RD Rising to Data Bus Tri-State WR Low Pulse Width Data Setup Time (Write) Data Hold Time (Write) Hold Delay (Read/Write) Min 40 40 40 40 160 — — 120 40 40 60 Typ — — — — — — 60 — — — — Max — — — — — 140 — — — — — UNITS ns ns ns ns ns ns ns ns ns ns ns Rev. 1.0 99 C P2200/1 16.3. Non-Multiplexed Motorola Format A[7:0] Valid Address T T /DS T D[7:0] T R/W Note: /CS must be asserted with or before /DS. VD1 AS AHR T DSR T HOLD T VD2 Valid Data T RWS RWH Figure 26. Nonmuxed Motorola READ A[7:0] Valid Address T T /DS T D[7:0] T R/W Note: /CS must be asserted with or before /DS. DS AS AHW T DSW T HOLD T DH Valid Data T RWS RWH Figure 27. Nonmuxed Motorola WRITE 100 Rev. 1.0 C P2200/1 Table 28. Non-Multiplexed Motorola Mode AC Parameters Parameter TAS TRWS TDSR TVD1 TVD2 TDSW TDS TDH TAHR TAHW TRWH THOLD Description Address Setup Time (Read/Write) R/W Setup Time (Read/Write) DS Low Pulse Width (Read) DS Falling to Valid Data Out (Read) DS Rising to Data Bus Tri-State (Read) DS Low Pulse Width (Write) Data Setup Time (Write) Data Hold Time (Write) Address Hold Time (Read) Address Hold Time (Write) R/W Hold Time (Read/Write) Hold Delay (Read/Write) Min 30 30 160 — — 120 40 20 30 30 20 60 Typ — — — — 60 — — — — — — — Max — — — 140 — — — — — — — — UNITS ns ns ns ns ns ns ns ns ns ns ns ns Rev. 1.0 101 C P2200/1 16.4. Multiplexed Motorola Format T AS T AD[7:0] T T T AS1 T AS2 AS AH VD1 VD2 Valid Address T Valid Data T DSR HOLD /DS T R/W Note: /CS must be asserted with or before /DS. RWS T RWH Figure 28. Multiplexed Motorola READ T AS T AD[7:0] T T T AS1 T AS2 AS AH DS DH Valid Address T Valid Data T DSW HOLD /DS T R/W Note: /CS must be asserted with or before /DS. T RWS RWH Figure 29. Multiplexed Motorola WRITE 102 Rev. 1.0 C P2200/1 Table 29. Multiplexed Motorola Mode AC Parameters Parameter TAS1 TAS2 TAS TAH TRWS TDSR TVD1 TVD2 TDSR TDS TDH TRWH THOLD Description AS High Pulse Width (Read/Write) AS Falling to DS Falling (Read/Write) Address Setup Time (Read/Write) Address Hold Time (Read/Write) R/W Setup Time (Read/Write) DS Low Pulse Width (Read) DS Falling to Valid Data Out (Read) DS Rising to Data Bus Tri-State (Read) DS Low Pulse Width (Write) Data Setup Time (Write) Data Hold Time (Write) R/W Hold Time (Read/Write) Hold Delay (Read/Write) Min 40 40 40 40 40 160 — — 120 40 60 60 60 Typ — — — — — — — 60 — — — — — Max — — — — — — 140 — — — — — — UNITS ns ns ns ns ns ns ns ns ns ns ns ns ns Rev. 1.0 103 C P2200/1 17. Revision-Specific Behavior This chapter contains behavioral differences between CP220x "REV C" and behavior as stated in the data sheet. 17.1. Revision Identification The Lot ID Code on the top side of the device package can be used for decoding device revision information. On CP220x devices, the revision letter is the first letter of the Lot ID Code. Figures 30 and 31 show how to find the Lot ID Code on the top side of the device package. CP2200 C CLZ9L This first character identifies the Silicon Revision Figure 30. Device Package—TQFP 48 S ILA B S C P 2201 CCNZW 2 T h is first ch ara cte r id e ntifie s th e S ilico n R e visio n Figure 31. Device Package—QFN 28 104 Rev. 1.0 C P2200/1 17.2. MAC Address Filtering Problem For unicast packets received over the Ethernet wire, the receive filter only validates the first 5 bytes of the 6-byte Ethernet MAC Address. Any packet addressed to a device whose MAC address only differs in the 6th byte will be allowed to pass through the receive filter. Workaround The Ethernet driver on the host controller should verify that the 6th byte of each packet (i.e., the final byte of the MAC address) matches its assigned MAC address. If it detects a mismatch, the packet should be discarded by writing 1 to the RXSKIP bit. Implications on Throughput This behavior does not slow down the rate which the embedded system can send or receive packets, since the CP220x must receive and filter all packets on the network. However, it can interrupt the host controller for received packets addressed to another device with a similar MAC address (where the only difference is in the 6th byte) on the same subnet. On a managed switch network, present on most corporate LANs, the effect of this behavior is minimal due to the fact that the managed switch filters out unicast packets not addressed to the receiving Ethernet device. Rev. 1.0 105 C P2200/1 DOCUMENT CHANGE LIST Revision 0.4 to Revision 0.41 Modified Figure 2, “Typical Connection Diagram (Non-Multiplexed),” on page 6 and Figure 3, “Typical Connection Diagram (Multiplexed),” on page 7 for improved EMI emmissions and common mode stability. Revision 0.41 to Revision 1.0 Added Maximum Supply Current specification in Table 2 on page 9. Updated the maximum XTAL1 Input Low Voltage specification from 0.8 to 0.7 V (see Table 8 on page 20). Updated the maximum RST Input Pullup Current specification from 40 to 50 µA (see Table 13 on page 42). Updated the Non-Multiplexed EMIF address hold time from 20 to 30 ns and the Tvd2 specification from 40 to 60 ns. Note that the Thold specification is unchanged from its value of 60 ns; therefore, changes to host timing will not be required in most applications. See Section 16 on page 96. Added a Revision-Specific Behavior chapter. See Section 17 on page 104. Removed text indicating that all packets on the wire can be received and buffered by the CP220x. 106 Rev. 1.0 C P2200/1 NOTES: Rev. 1.0 107 C P2200/1 CONTACT INFORMATION Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 Email: MCUinfo@silabs.com Internet: www.silabs.com The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages. Silicon Laboratories, Silicon Labs, and USBXpress are trademarks of Silicon Laboratories Inc. Intel, Motorola, and any other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. 108 Rev. 1.0