Re: [oc] CRC calculation.

["llbutcher" <llbutcher@veriomail.com>]

Naveena:

I made a CRC checker which I stored in misc/crc32_lib.v
There is nothing original in there.  I mostly tried to see if
there was a way to break up the calculation so that it had
a minimum number of logic levels.

I wonder how fast you need to calculate your CRC.

If you have a slow serial link, a bit-at-a-time calculation seems best.

If you need a faster one, I suggest a wide calculation followed by
transfering the partial CRC to a smaller CRC function, where you
calculate the effect of the bytes which don't fill up the larget block.

I think that a 64 bit version, or at worst a 128 bit version, should
be able to keep up with a 10 GBit connection in a fast FPGA.

Blue Beaver


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From: naveena.padmaraju@wirpo.com
Date: Sat, 29 Sep 2001 14:06:19 +0200
Subject: [oc] CRC calculation.

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Subject: [oc] CRC calculation.
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hi Allan,

In our logic, input data to hdlc is variable. My internal input buffer is
128bit,bcose for 128bit processing.output of this is i am send it to CRC
calculator. so i want to do crc calculation for 128bit data, this data is
again variable from 1byte to 16byte.how can i do the crc for this.

Thanks & Rgds...

-Naveena P.



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