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Re: Re: [ethmac] got my CRC running(mine is not)
Hi,
It will be very nice if you can send the files. Also
if you could explain littlebit with that i'll highly
appriciate as i am using verilog and not familliar
with VHDL....
Waiting for reply.
Thanks,
Waman.
--- brecht@cbedv.com wrote:
> 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@yahoo.com> 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@cbEDV.com
> > >
> >
>
-------------------------------------------------------
> > >
> > > ----- 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@opencores.org'
> > > 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@cbedv.com]
> > > Sent: Friday, May 03, 2002 3:42 AM
> > > To: ethmac@opencores.org
> > > 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
>
=== message truncated ===
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