Description
You should set 0 to both AUTO_NEGOTIATION_ENABLE and USE_SGMII_AN registers of the Triple-Speed Ethernet MegaCore® Function to turn off SGMII Auto-Negotiation feature.
To turn on SGMII Auto-Negotiation feature, you should set 1 to both AUTO_NEGOTIATION_ENABLE and USE_SGMII_AN registers. For more details of SGMII configuration, refer to Triple-Speed Ethernet System with SGMII section of Triple-Speed Ethernet MegaCore Function User Guide (PDF).