OpenCores 10/100 EMAC problems

Hi,

I'm using the same core in some of my designs, it works flawless,

although in a NIOS II 5.0 environment.

I had similar problems with an other EMAC core when shifting from

10 to 100Mbps, the problem was that the system clock was too slow.

Whats the system clock frequency in your design?

Does the EMAC report a TX error?

Try if you see something with a packet sniffer like ethereal or packetyzer

Cheers, Roger