Forum Discussion

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

1G Ethernet - Cyclone III demo board EP3C120F780

Has anyone successfully gotten the physical on the cyclone III demo board to work with the RMGII interface? After looking at all of the documentation for the kits for Altera, none of them use the int...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The standard nios reference design delivered with the kit is using the PHY chip with a RGMII interface at 1gigabit. IIRC they didn't bother to put SDC constraints and the interface is just working out of pure luck.

Are you using the Altera drivers with the Interniche stack? There is a register in the PHY chip to shift the RGMII signals by 90 degres, which can help in some situations. I think the driver does that during setup.