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AM79C875KC Datasheet(PDF) 24 Page - Advanced Micro Devices |
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AM79C875KC Datasheet(HTML) 24 Page - Advanced Micro Devices |
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24 / 48 page ![]() Idle Start Opcode (Read) PHY Address 16h, Port 2 Register Address MII Status, 1h TA Register Data Idle z z z MDC MDIO (PHY) MDIO (STA) z z 0 1 1 0 1 0 1 1 0 0 0 0 0 1 0 0 1 1 0 0 00 010 0 0 0 0 1 0 z z Read Operation Idle Start Opcode (Write) PHY Address 16h, Port 2 Register Address MII Control, 0h TA Register Data Idle z z MDC MDIO (STA) z 01 01 1 0 1 1 00 0 0 0 0 1 0 0 1 1 0 0 0 1 0 0 0 0 0 0 0 0 0 z Write Operation 22236G-11 24 Am79C875 Figure 9. PHY Management Read and Write Operations Bad Management Frame Handling The management block of the device can recognize management frames without preambles (preamble suppression). However, if it receives a bad manage- ment frame, it will go into a Bad Management Frame state. It will stay in this state and will not respond to any management frame without preambles until a frame with a full 32-bit preamble is received, then it will return to normal operation. A bad management frame is a frame that does not comply with the IEEE standard specification. It can be one with less than 32-bit preamble, with illegal OP field, etc. However, a frame with more than 32 preamble bits is considered to be a good frame. Table 5. NetPHY™ 4LP MII Management Register Set Register Address (in decimal) Description 0 MII Management Control Register 1 MII Management Status Register 2 PHY Identifier 1 Register 3 PHY Identifier 2 Register 4 Auto-Negotiation Advertisement Register 5 Auto-Negotiation Link Partner Ability Register 6 Auto-Negotiation Expansion Register 7 Next Page Advertisement Register 8-15 Reserved 16 Miscellaneous Features Register 17 Interrupt Control/Status Register 18 Diagnostic Register 19 Test Register 20 Miscellaneous Features 2 21 Receiver Error Counter 22 Reserved 23 Reserved 24 Mode Control Register 25-31 Reserved |
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