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74740-0001 Datasheet(PDF) 7 Page - Molex Electronics Ltd. |
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74740-0001 Datasheet(HTML) 7 Page - Molex Electronics Ltd. |
7 / 11 page 1000Base-T RJ-45 Gigabit Ethernet GBIC Copper Transceiver AUTO-NEGOTIATION SOFTWARE SELECTIONS Through random I2C read commands, the host can change the auto-negotiation state of the GBIC. When auto-negotiation in the GBIC is off, the GBIC does not automatically query the host and advertise pause flow control on the copper interface. If the host requires advertisement of pause flow control and auto-negotiation is off, the host can set pause, and asymmetric pause using the defined I2C commands. Serial ID addresses 128-133 are used in the random I2C read commands. The read commands, and GBIC actions are defined in the I2C Command Table. I2C Command Table I2C Read Address Description GBIC Actions 128 ( 0x80 ) GBIC Auto-Negotiation Status • Return Status Byte • Turn Auto-Negotiation ON • Restart Auto-Negotiation • Return Status Byte • Turn Auto-Negotiation OFF • Restart Auto-Negotiation • Return Status Byte • Clear Pause Flow Control • Clear Asymmetric Pause • Return Status Byte SERDES Pause Flow Control Advertisement • Set SERDES Pause Flow Control Bit (auto-negotiation off only) • Return Status Byte SERDES Asymmetric Pause Flow Control Advertisement • Set SERDES Asymmetric Pause Flow Control Bit (auto-negotiation off only) • Return Status Byte 129 ( 0x81 ) Enable Auto-Negotiation 130 ( 0x82 ) Disable Auto-Negotiation 131 ( 0x83 ) Clear SERDES Pause Flow Control Advertisement 132 ( 0x84 ) 133 ( 0x85 ) GBIC Status Byte Bit Description 7 Reserved 6 Reserved 5 Reserved 4 Copper has Advertised Asymmetric Pause 3 Copper has Advertised Pause 2 Host to Advertise Asymmetric Pause on Copper 1 Host to Advertise Pause on Copper 0 GBIC Auto Negotiation Status 1 = On / 0 = Off |
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