02-22-2010 07:03 AM
We are using Gigabit Ethernet hard macro on xc5vlx30t-ff665-1 device for one of our project. We are using SGMII link between FPGA and the external PHY chip. The problem we are facing is that sometimes (very frequently) the SGMII autonegotiation process between FPGA and external PHY never completes and the Gigabit Ethernet port is no more usable. We have also found that, if temparature of the FPGA chip increased, then SGMII autonegotiation process completes.
Can somebody suggest what to do to establish Gigabit SGMII link if autonegotiation fails?