From: "Tracy Briscoe" <tmb15@computerscience.waikato.ac.newzealand>
Newsgroups: comp.arch.fpga
Subject: Ethernet CRC
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Hi.

I've been fighting with Ethernet CRCs for to long now.  Could someone please
tell me how to generate a valid Ethernet CRC.  I'm using a function
generated by http://www.easics.be/webtools/crctool, that takes the data in
in 4bit nibbles at a time.

Thanks
-Tracy
ps replace computerscience with cs, and newzealand with nz when repling to
me.

######

From: Douglas Grant <douglas.grant@xilinx.com>
Newsgroups: comp.arch.fpga
Subject: Re: Ethernet CRC
Date: Wed, 29 Aug 2001 20:59:36 +0100
Organization: Xilinx,Inc
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This is a multi-part message in MIME format.
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What do you want to do? Create some hardware? Software? Test your SW/HW?

DG

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######

From: "Tracy Briscoe" <tmb15@computerscience.waikato.ac.newzealand>
Newsgroups: comp.arch.fpga
References: <999091444.566415@clint.its.waikato.ac.nz> <3B8D49A8.60A5A49E@xilinx.com>
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Xref: chonsp.franklin.ch comp.arch.fpga:9630

I'm trying to generate the CRC in hardware.  The problem that I've got is
that every combination that I've tried to generate the CRC, and place it in
a frame, comes back as invalid.  I've attached my vhdl testbench, in which I
doing all this. This is all part of a custom hardware project, that will
transmit and receive frames to and from Ethernet.

"Douglas Grant" <douglas.grant@xilinx.com> wrote in message
news:3B8D49A8.60A5A49E@xilinx.com...
> What do you want to do? Create some hardware? Software? Test your SW/HW?
>
> DG
>


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`
end

######

From: Mike Treseler <mike_dot_treseler@flukenetworks.com>
Newsgroups: comp.arch.fpga
Subject: Re: Ethernet CRC
Date: Thu, 30 Aug 2001 10:11:25 -0700
Organization: Fluke Networks
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Tracy Briscoe wrote:
> 
> I'm trying to generate the CRC in hardware.  The problem that I've got is
> that every combination that I've tried to generate the CRC, and place it in
> a frame, comes back as invalid.  I've attached my vhdl testbench, in which I
> doing all this. This is all part of a custom hardware project, that will
> transmit and receive frames to and from Ethernet.

lots of possible bit/byte order problems.
check out:

http://www.erg.abdn.ac.uk/users/gorry/course/dl-pages/crc.html

especially:

   "Bit Order

   "The CRC is the only field which is by convention 
    sent most significant bit first. 
    (This is contrary to all header and payload bytes 
    which are sent least significant bit first.)
   Thus the first bit of the a CRC-32 to be sent 
   is the bit corresponding to X32 and the last, 
   the bit corresponding to X0."

Good luck.

 --Mike Treseler