MII to RMII vhdl code?

[JimboD2]

Hi,I've got a project and need some advice on where to start, what references to look at, etc.

Basically, I need to provide an RMII interface to a MAC, but the PHY I have is MII. I need to write some vdhl so the FPGA can translate between RMII and MII interfaces.

Where could I begin with this? I am not familiar with the 802.3 protocol (at least, not in the level of detail needed), and the spec is 1500 pages! Any advice would be appreciated. Id like to hear from someone experienced in this area to tell me how big a job this is, as i have no idea.

Thanks again

 

[stel]

Check

http://www.opencores.org

and see if someone else has already done it.

 

[JimboD2]

Checked out open cores and ran some internet searches, but I cant find anything that's been done. After reviewing the RMII and MII specs, it seems possible to do though. Not 100% clear on the RMII operation as there's not much info on the net, though. If anyone has worked with RMII PHY/MAC interfaces before id like to pick your brain sometime.

Right now im trying to see if i need the TX_ERR signal (tells the PHY to transmit erroroneous data on the line, as far as i can tell).