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UG-01008
2015.06.15
SGMII Auto-Negotiation
Figure 4-16: Auto-Negotiation Activity (Simplified)
Link Partner
PCS
Link
Synchronization
Acquired
/C/ with 0x00 ability
Link Timer
3 Consecutive /C/
with Acknowledge
/C/ with dev_ability register and
ACK bit set to 1
3 Consecutive /C/
/C/ with dev_ability register and
ACK bit set to 0
Link Timer
= 10 ms
Send /I/ (Idle) sequence
Link Timer
Data
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.
Altera Corporation
Functional Description
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