Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Auto-Negotiation FAILED with TSEMAC and PHY Marvell 88E1111

I'm trying to check single socket example in a Cyclone III EP3c40. I've configured in SOPC in both case: as 10/100/1000Mbps Ethernet Only as 1000Mbps Small MAC result was always the sa...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

The problem could come from the GMII interface. Are you providing the correct clocks in gigabit mode?

Another cause could be bad timing on the GMII signals. Did you set up the constraints on all the signals? I had to use a pll to delay the clock on the transmit side in order to meet the constraints (unfortunately I don't have the kit here, I cn't check what I did).