126.96.36.199. SGMII Auto-Negotiation
Possible application of SGMII auto-negotiation in MAC mode and PHY mode.
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.
For more information, refer to CISCO Serial-GMII Specifications.
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