OpenCores 10/100 EMAC problems

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originally posted by rsteiner@Oct 27 2005, 12:40 PM

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

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Hi Roger,

thank you for your reply.

My system clock is actually 66MHz but I tried it also with 75MHz.

I already sniffed the network traffic with ETHEREAL and I figured out, that the packets sent from the embedded system are really lost ( I do see nothing in ETHEREAL).

I will try to figure something out about TX Errors.

What driver did you use in your design?

Best regards, Marco.