Re: [usb] crc algorithm

[Bo <bo_ye@yahoo.com>]

All right, here you go ...
You can change the INPUT_LENGTH
to any number you like. The datain is pure random 
input to simulate the real wold application, 
you should always get the same CRC result, 
which is 5'b01100 for USB 5-bit CRC.
You can also check the other different CRC using
this testbench, just replace the poly part, not
my name :)

Have fun, and let me know if you have question.


regards
bo


--- RE Tambunan <kebloo@mitra.net.id> wrote:
> Hello Bo...
> 
> On 21 Feb 2002 at 17:55, Bo wrote:
> 
> > Hi Tambuna,
> > 	Thanks for your example.
> Your welcome...
> 
> > 	It calculates one byte at a time
> > instead of one bit. That can be used for
> > hardward acceleration. Actually, there are
> > several ways to do it, depends on how you
> > compare your result to check weather the CRC check
> > sum is correct or not.
> You're right :-)... that's the purpose of
> discussion...
> 
> > 	Did you try your code with different
> > input (using random input), and come out the
> > same result?
> I've checked it only with examples from the
> whitepaper
> because it will give me reference results. Do you
> have
> any specific examples?..
> 
> > 	If you like I can write a small verilog
> > code for you.
> Yes... I'd like that ... besides... it will benefit
> the other,
> doesn't it ?...
> 
> > 
> > regards
> > bo
> > 
> Best regard,
> 
> 
> 
> RE Tambunan
> --
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