OpenCores 10/100 EMAC problems

Hi Marco,

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originally posted by mschulz@Oct 28 2005, 12:29 AM

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?

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The OpenCores EMAC is running fine with 75MHz in my current design,

although i don&#39;t know if there is a requirement for a minimum system

clock frequency and what that would be.

Since the EMAC is fetching the data trough its own DMA, could it be that your

avalon bus is congested? Maybe it helps to fiddle with the arbitration.

In my system i use a NIOS II/f core, so the caches might help.

As for the driver, i rolled my own, i took the core&#39;s manual and the igor.c

as documentation.

Cheers, Roger