Altera Triple Speed Ethernet MegaCore Function - Manual (Page 66)

Figure 4-16: Auto-Negotiation Activity (Simplified)
Data
Link Partner PCS
Link
Synchronization
Acquired
Link Timer
= 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
Conse
cuti
ve
/C/
with
Ac
kn
owledge
3
Conse
cuti
ve
/C/
Link
Timer
Link
Timer
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
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UG-01008
SGMII Auto-Negotiation 4-30
2014.06.30