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Altera_Forum's avatar
Altera_Forum
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15 years ago

FCS(crc32) ethernet on cycloneII?

I have tested free internet codes for FCS ethernet, but it don't work. What's wrong? HELP me please gurus! CRC32 FOR 1 FIXED BYTE(0X1A) rstn->always 0 enable->always 1 init->1 ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Try:

inverting the input

inverting the output(this one is usually obvious)

reversing the word order in

reversing the word order out

All combinations of that. I had a similar situation where a CRC I had was supposed to match that of a "black-box" CRC. What a pain. On top of it all there was a typo in one of the equations so it used the wrong bit. It was a week of my life I'd love to get back. Bottom line is be rigorous in checking every combination. (The final one was flipping the order of 8-bit boundaries, but I think that was unique to my case...)