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Message
From: brecht@c...
Date: Tue, 07 May 2002 21:40:19 +0200
Subject: Re: Re: [ethmac] got my CRC running(mine is not)
Hi Waman!
How funny, it seems that I am now in the position to help (well, maybe).
I've the CRC-32 (nibbe input, simple to change with the byte version
from easics.com) and a very easy to understand testbench as well, but it
is written in VHDL.
If this might help I can send these files to you!?
Greets,
Christian
waman mainkar <waman_m@y...> schrieb am 07.05.2002, 02:52:29:
> HI,
> i have got the equation from www.easic.be for 8 bit
> data path and CRC-32....
> and then for this function i am providing input 8 bit
> data and a updating value of buffer like:
>
> crcbuffer = countcrc [this is function]
> (RxDI[data],crcbuffer);
>
> and then on the positive edge of clk i am comparing it
> with the magic no. and if it is equal then CRCOK in
> 1....
>
> i believe this logic is correct. but, i am not able to
> test it. so can anybody help me. i'll really
> appriciate that.
>
> waiting for replies.
>
> Thanks,
>
> Waman.
>
>
>
>
> --- "Christian R. Brecht" wrote:
> > Hi all!
> >
> > Thank you very much for your help! Finally I have a
> > running version of my
> > CRC (which in fact was never wrong, I just used it
> > the wrong way )-: )...
> >
> > You've bee a big help! Thx!
> >
> > Christian
> >
> >
> >
> -------------------------------------------------------
> > Christian R. Brecht
> > Brecht@c...
> >
> -------------------------------------------------------
> >
> > ----- Original Message -----
> > From: "Illan Glasner"
> > To:
> > Sent: Monday, May 06, 2002 7:47 PM
> > Subject: FW: [ethmac] CRC question
> >
> >
> >
> > Hi,
> >
> > From some reason my replay Email didn;t
> > appear till now so I will
> > re-send it in hope this time it will pass the
> > barrier.
> >
> > have a nice day
> >
> > Illan
> >
> > -----Original Message-----
> > From: Illan Glasner
> > Sent: Friday, May 03, 2002 9:59 AM
> > To: 'ethmac@o...'
> > Subject: RE: [ethmac] CRC question
> >
> >
> >
> > Hi,
> >
> > Hope the following files will help you and any
> > other who might be
> > struggling with this crc as well as anyone who use
> > crc RTL code in his
> > behavoral instead of using task.
> >
> > crc4.v :
> > basicly the first run you simple compile it and it
> > calculate crc for few
> > data.
> >
> > than I took this data which have the crc value and
> > push it back and got the
> > magic number.
> >
> > for the second run you need to use th
> > +define+second_run
> >
> > of course the second run 8 extra data are determine
> > from the first run so it
> > is not "general" solution but it should help yu see
> > why you don;t get the
> > right value in your crc
> >
> > crc_calc_task.v
> > to make your simulation more effective I also added
> > a task that you should
> > use in any behavioral test bench which will
> > calcualte the crc in zero time.
> >
> > if you are intrested in how the crc equation are
> > constract this task is the
> > starting point as it have the basic single bit
> > formula and than you can
> > expand it for using it for any width as well as
> > using De-Morgan rules you
> > can get the equation for any width. (or simple go to
> > asics site and get it
> > done more quickly).
> >
> > have a nice day
> >
> > Illan
> >
> >
> >
> > -----Original Message-----
> > From: Christian R. Brecht [mailto:Brecht@c...]
> > Sent: Friday, May 03, 2002 3:42 AM
> > To: ethmac@o...
> > Subject: [ethmac] CRC question
> >
> >
> >
> > Dear All!
> >
> > I know this is not an ethmac question but for you
> > this will be an easy one:
> > I am working on my diploma work right now and for
> > some reasons I cannot use
> > your ethernetcore as we need some special things
> > implemented. But one thing
> > is similar: the CRC in general.
> > I guess I understood the CRC itself but for me it
> > seems the CRC-32 for
> > ethernet needs some weird extras like inverting the
> > 32 bits and reflecting
> > them as well. I will have to initialize the register
> > with "F"s as the first
> > step.
> >
> > Q: After all, usually I have to put zeros into the
> > CRCC. Do I have to put 0s
> > into this CRC-32C as well, or do I need to put Fs to
> > get it run (I need
> > nibbles for input). The problem is I have two
> > "testpatterns", one does the
> > job (60 Bytes of zeros work with mine) the other
> > doesn't. I used the CRC-32
> > from easics.com (CRC-Tool). I tried almost every
> > combination. Am I doing a
> > major mistake?
> > Does someone of you have an 4:32-implementation of
> > an CRCC (well, I am
> > programming in VHDL actually, but this should not be
> > a problem)? Or another
> > testpacket? I would be really happy about that.
> >
> > Thank you very much for your time reading this.
> >
> >
> >
> > Sincerely yours,
> > Christian
> > university of applied technology cologne
> >
> >
> >
> >
> >
> >
>
>
>
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