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FAIXP972MQCA4 Datasheet(PDF) 24 Page - Intel Corporation |
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FAIXP972MQCA4 Datasheet(HTML) 24 Page - Intel Corporation |
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24 / 92 page  Intel ® LXT972M Single-Port 10/100 Mbps PHY Transceiver 24 Datasheet Document Number: 302875-005 Revision Date: 27-Oct-2005 5.2.1.1 Twisted-Pair Interface The LXT972M Transceiver supports either 100BASE-TX or 10BASE-T connections over 100 Ω, Category 5, Unshielded Twisted Pair (UTP) cable. When operating at 100 Mbps, the LXT972M Transceiver continuously transmits and receives MLT3 symbols. When not transmitting data, the LXT972M Transceiver generates “IDLE” symbols. During 10 Mbps operation, Manchester-encoded data is exchanged. When no data is being exchanged, the line is left in an idle state. Link pulses are transmitted periodically to keep the link up. Only a transformer, RJ-45 connector, load resistor, and bypass capacitors are required to complete this interface. On the transmit side, the LXT972M Transceiver has an active internal termination and does not require external termination resistors. Intel's patented waveshaping technology shapes the outgoing signal to help reduce the need for external EMI filters. Four slew rate settings allow the designer to match the output waveform to the magnetic characteristics. On the receive side, the internal impedance is high enough that it has no practical effect on the external termination circuit. (For the slew rate settings, see Table 56, “Transmit Control Register - Address 30, Hex 1E” on page 89.) Note: On the LXT972M Transceiver, MDIX crossover (MDIX) is supported by board design. 5.2.1.2 Remote Fault Detection and Reporting The LXT972M Transceiver supports the remote fault detection and reporting mechanisms. “Remote Fault” refers to a MAC-to-MAC communication function that is transparent to PHY layer devices. It is used only during auto-negotiation, and is applicable only to twisted-pair links. Remote Fault Detection. Register bit 4.13 in the Auto-Negotiation Advertisement Register is reserved for Remote Fault indications. It is typically used when re-starting the auto-negotiation sequence to indicate to the link partner that the link is down because the advertising device detected a local fault. When the LXT972M Transceiver receives a Remote Fault indication from its partner during auto- negotiation, the following occurs: • Register bit 5.13 in the Link Partner Base Page Ability Register is set. • Remote Fault Register bit 1.4 in the MII Status Register is set to pass this information to the local controller. |
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