Forum Discussion

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

Auto-Negotiation FAILED

I have a custom board with the 88E111 Ethernet PHY. At one point, the board would light up LEDs indicating a link has been made and it was in 100 mode. I did not change my design at all, but no...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

--- Quote Start ---

I seem to have fixed the problem, hopefully permanently, by adding a 100 clock cycle delay til I drive the ethernet PHY reset line high when the board powers up.

--- Quote End ---

Is it Marvell 88E1111 chip? Did You read the datasheet then? It needs about 50ms reset after power up. Kinda annoying bug.