Altera Triple Speed Ethernet MegaCore Function - Manual (Page 67)

Figure 4-17: SGMII Auto-Negotiation in MAC Mode and PHY Mode
SGMII PCS
(MAC Mode)
SGMII Link
Medium
Twisted
Copper
Pair
Device Ability
Link Partner Ability
Altera Device
Triple Speed Ethernet
MegaCore Function
SGMII PCS with PMA
(PHY Mode)
Device Ability
Link Partner Ability
Altera Device
Triple Speed Ethernet
MegaCore Function
Device Ability
10/100/1000BASE-T PHY 10/100/1000BASE-T PHY
Link Partner
Link Partner Ability
Device Ability
Link Partner Ability
If the
SGMII_ENA
and
USE_SGMII_AN
bits in the
if_mode
register are 1, the PCS function is automatically
configured with the capabilities advertised by the PHY device once the auto-negotiation completes.
If the SGMII_ENA bit is 1 and the USE_SGMII_AN bit is 0, the PCS function can be configured with the
SGMII_SPEED
and
SGMII_DUPLEX
bits in the
if_mode
register.
If the
SGMII_ENA
bit is 1 and the
SGMII_AN_MODE
bit is 1 (SGMII PHY Mode auto-negotiation is enabled)
the speed and duplex mode resolution will be resolved based on the value that you set in the dev_ability
register once auto negotiation is done. You should use set to the PHY mode if you want to advertise the link
speed and duplex mode to the link partner.
Altera Corporation Functional Description
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4-31 SGMII Auto-Negotiation
UG-01008
2014.06.30