Forum Discussion
Altera_Forum
Honored Contributor
13 years agoDid you have timing constraints on your RGMII I/O pins. It was several years ago, but when I tried to make the Cyclone III development kit work with Ethernet (at that time there was no example design with that kit) it didn't work until I put correct timing constraints. I don't think I ever used a shifted clock.
IIRC there is also an MDIO register that you can use to make the 88E1111 shift the RGMII clock itself. But as the datasheet isn't publicly available it's hard to find. I think it was discussed on this forum a while ago too.