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RTL8211FD-CG Datasheet(PDF) 30 Page - Realtek Semiconductor Corp. |
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RTL8211FD-CG Datasheet(HTML) 30 Page - Realtek Semiconductor Corp. |
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30 / 72 page  RTL8211F(I)/RTL8211FD(I) Datasheet Integrated 10/100/1000M Ethernet Transceiver 23 Track ID: JATR-8275-15 Rev. 1.1 7.12.1. Auto-Negotiation Priority Resolution Upon the start of auto-negotiation, to advertise its capabilities each station transmits a 16-bit packet called a Link Code Word (LCW), within a burst of 17 to 33 Fast Link Pulses (FLP). A device capable of auto-negotiation transmits and receives the FLPs. The receiver must identify three identical LCWs before the information is authenticated and used in the arbitration process. The devices decode the base LCW and select capabilities with the highest common denominator supported by both devices. To advertise 1000Base-T capability, both link partners, sharing the same link medium, should engage in Next Page (1000Base-T Message Page, Unformatted Page 1, and Unformatted Page 2) exchange. Auto-negotiation ensures that the highest priority protocol will be selected as the link speed based on the following priorities advertised through the Link Code Word (LCW) exchange. Refer to IEEE 802.3 Clause 28 for detailed information. 1. 1000Base-T Full Duplex (highest priority) 2. 1000Base-T Half Duplex 3. 100Base-TX Full Duplex 4. 100Base-TX Half Duplex 5. 10Base-T Full Duplex 6. 10Base-T Half Duplex (lowest priority) 7.12.2. Auto-Negotiation Master/Slave Resolution To establish a valid 1000Base-T link, the Master/Slave mode of both link partners should be resolved through the auto-negotiation process: • Master Priority Multi-port > Single-port Manual > Non-manual • Determination of Master/Slave configuration from LCW Manual_MASTER=U0*U1 Manual_SLAVE=U0*!U1 Single-port device=!U0*!U2 Multi-port device=!U0*U2 Where: U0 is bit 0 of the Unformatted Page 1 U1 is bit 1 of the Unformatted Page 1 U2 is bit 2 of the Unformatted Page 1 |
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