
Figure 4-16: Auto-Negotiation Activity (Simplified)
Data
Link Partner PCS
Link
Synchronization
Acquired
LinkTimer
= 10 ms
/C/ with dev_ability register and
ACK bit set to 0
/C/ with dev_ability register and
ACK bit set to 1
Send /I/ (Idle) sequence
/C/ with 0x00 ability
3 Consecutive /C/
with Acknowledge
3 Consecutive /C/
LinkTimer
LinkTimer
Once auto-negotiation completes successfully, the ability advertised by the link partner device is available
in the partner_ability register and the AUTO_NEGOTIATION_COMPLETE bit in the status register is set to 1.
The PCS function restarts auto-negotiation when link synchronization is lost and reacquired, or when you
set the RESTART_AUTO_NEGOTIATION bit in the PCS control register to 1.
SGMII Auto-Negotiation
In SGMII mode, the capabilities of the PHY device are advertised and exchanged with a link partner PHY
device.
Possible application of SGMII auto-negotiation in MAC mode and PHY mode.
Functional Description
Altera Corporation
Send Feedback
UG-01008
SGMII Auto-Negotiation
4-30
2014.06.30
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