"Moti Cohen" <[email protected]> wrote in message
news:[email protected] om...
> Hy all,
> I'm currently implementing a receiver (vhdl) part of the ethernet mac
> which is responsible for the MII interafce. I'm need an crc32
> calculator (RTL) to check the FCS field. I've tried using the easics
> crctoll in order to create the mechanism (for a 4 bit data input) but
> it does not seems to work. does anyone have a working (rtl) vhdl
> implementation for this block? or at least a detailed expalnation on
> how to create it..?
> Thanks in advance, Moti.


Hi Moti,

I have done a CRC32 with 16bit parallel input using easics and it took me
loads of time to figure out that it was working perfectly from the
beginning.!
Speaking with more people, I found out that most of them had similar
problems verifying the outcome.

My advice is to sit down and find a methodical way to test it.

http://rcswww.urz.tu-dresden.de/~sr21/crc.html
using this calculator and putting the settings
CRC order (1..64) : 32

CRC polynom (hex) :4C11DB7

Initial value (hex) :FFFFFFFF

Final XOR value (hex) : 0

direct : checked

and the rest of options: unchecked

worked for me at least.

Check this link too, it has one more crc_gen, (I haven't used it myself
though).

http://www.ee.ualberta.ca/~elliott/e...rnet.html#vhdl