Integrated 10/100/1000M Ethernet Transceiver
Track ID: JATR-8275-15 Rev. 1.1
1. If it is set to half duplex, then only half duplex is advertised.
2. If it is set to full duplex, then both full and half duplex are advertised.
If the user wishes to advertise only full duplex at a particular speed with the Crossover Detection &
Auto-Correction function enabled, then Auto-Negotiation should be enabled (register 0.12) with the
appropriate advertising capabilities set in registers 4 or 9. The Crossover Detection & Auto-Correction
function may be enabled/disable by setting (register 24.[9:8]) manually.
After initial configuration following a hardware reset, Auto-Negotiation can be enabled and disabled via
register 0.12, speed via registers 0.13, 0.6, and duplex via register 0.8. The abilities that are advertised can
be changed via registers 4 and 9. Changes to registers 0.12, 0.13, 0.6, and 0.8 do not take effect unless at
least one of the following events occurs:
• Software reset (register 0.15)
• Restart of Auto-Negotiation (register 0.9)
• Transition from power-down to power-up (register 0.11)
Registers 4 and 9 are internally latched once each time Auto-Negotiation enters the ABILITY DETECT
state in the arbitration state machine (IEEE 802.3). Hence a write into register 4 or 9 has no effect once the
RTL8211F(I)/RTL8211FD(I) begins to transmit Fast Link Pulses.
Register 7 is treated in a similar manner as 4 and 9 during additional Next Page exchanges. Once the
RTL8211F(I)/RTL8211FD(I) completes Auto-Negotiation, it updates the various statuses in registers 1, 5,
6, and 10. The speed, duplex, page received, and Auto-Negotiation completed statuses are also available in
registers 26 and 29.