calculate (and validate) ethernet FCS (crc32) in vhdl

Question

I\'m using the Spartan 3E Starter Kit and I\'m trying to receive Ethernet frames on it via a 100 MBit link.

For those who don\'t know, the board features a PHY chip, exp

Answer 1

The generator you used may not be pre-processing and post-processing the data. If that generator takes a string of zeros and produces a zero crc, then that's the problem. A string of zeros should not produce zero. (What it produces depends on the number of zeros.)

The processing for the Ethernet crc is to invert the crc, then apply the crc algorithm, then invert the crc again.