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Re: [bluetooth] Re: Re: Re: CRC sample dataquestion??pls reply ASAP
hi..
I did the CRC code...and I also got a swapped value....exactly the same
way as u did...MSB:LSB i declared the same way as u did....i also got
d26d....i dont know if this is correct.
Also can someone guide me thru the process of making the access code
correlator..should I make the receive side first.How should I go about
this?
On Fri, 2 May 2003 ccsin@k7mail.com wrote:
> Hi Anil Nainwal and all members,
>
> I think that my code is correct.Let me explain here,
>
> In my Verilog code, I declared:
> uap[7:0]
> crc[15:0]
> data[7:0]]
>
> I assume the Sample data (please check pg979) for "data" and "uap" are defined in
> this manner:
>
> ********LSB on the right,MSB on the left******
>
> Therefore I load uap and data_in in the way shown below:
>
> uap[7:0] = b'01000111 //0x47
>
>
> data[0]=4e=01001110 ; data_in is 1st '0',2nd '1',3rd '1', 4th '1',5th '0',and so on //0x4e
> .
> .
> .
> .
> .
> .
> data[9] = 09 = 00001001;data_in is 1st '1',2nd '0,3rd '0', 4th '1',5th '0'.......and so on
>
>
> after all the data is fed, i got crc[15:0] = b64b
> but in the spec(on page 73), it stated that the bit15 should be out, then bit14...and so
> on.
>
> therefore crc = d26d
>
> what i suspect that they swap the 1st and 2nd byte,so crc = 6dd2
>
>
> Am I right?? Anyone has done the CRC?? please tell me if i'm wrong. If you would like
> to check for me,i will send you the code
>
> BTW,if i load uap = 57,and the data still remains the same,i got crc=a7ad, is it
> correct??
>
> Thank You
>
> Best Regards
>
> Chuan Chew
> -------------------------------------------------------------
>
> ----- Original Message -----
> From: "Anil Nainwal - Sofblueindia"
> <anilnainwal@s... >
> To: "ChuanChew Sin" <ccsin@k... >
> <bluetooth@o... >, "Jamil Khatib"
> <khatib@o... >
> Date: Wed, 30 Apr 2003 10:29:36 +0530
> Subject: [bluetooth] Re: Re: Re: CRC sample dataquestion??pls reply
> ASAP
>
> > Dear Chuan,
> >
> > I went through your code.
> >
> > The problem that I could see is:
> >
> > In your module crc_ccitt , You have defined output [`BITS_OUT-1:0]
> > crc_out;
> >
> > This means that MSB is bit 15(16th bit) and LSB is bit 0.
> > Fine….
> >
> >
> >
> > Now, UAP is 47 that is (0100 0111) with LSB on the left most side
> > i.e UP0(LSB) is 0 and UP7(MSB) is 1.--------(1)
> >
> > Now, in both test benches, you have defined reg [`BYTE-1:0] uap,
> > this means if written in a format of (ABCD EFGH) , A will be MSB
> > and H is LSB
> >
> > CASE 1: Now, when you initialize uap in test bench crc_sim you are
> > initializing it as
> >
> > uap= `BYTE'h47; ie 0100 0111
> >
> > it means msb (UP7) is 0 and LSB (UP0) is 1. now compare it with
> > (1) and you will find it's mismatching. So here is the problem.
> >
> >
> >
> > CASE 2: When you initialize UAP in crc_sim1, what you are doing
> > is…
> >
> > uap= `BYTE'h2e; ie 0010 1110.
> >
> > This means MSB (UP7) is 0,… UP5= 1… UP1=1 and
> > LSB(UP0)=0.
> >
> > Now compare it again with (1) and you will find all the bits are
> > mismatching.
> >
> >
> >
> > I think Similar kind of problem is there while initializing others.
> >
> > Solution:
> >
> > If you have defined reg [`BYTE-1:0] uap, then initialize uap as
> > (1110 0010) that comes to be E2. and not 2E.
> >
> > But check the same problem while initializing other parameters as
> > well.
> >
> >
> >
> > Then one more solution that comes to my mind is you define reg
> > [0:`BYTE-1] uap, and then initialize it as in CASE 1, ie 47 (0100
> > 0111) this will make 0 as MSB and 1 as LSB. And this is same as
> > (1), I havenot tried it yet but you try and then please tell me if
> > it works.
> >
> > But do take care while initializing others, this is one basic
> > problem i could see on first go, I will check it more. but till
> > then you try this and also check that other initializations are
> > fine.
> >
> > you are welcome to put your queries....
> >
> > If I am wrong..plz let me know.. suggestions will be appreciated.
> >
> > Best Regards
> >
> > Anil Nainwal
> >
> >
> > ----- Original Message -----
> > From: "ChuanChew Sin" <ccsin@k... >
> > To: <anilnainwal@s... >
> > Sent: Tuesday, April 29, 2003 7:31 AM
> > Subject: Re: Re: Re: CRC sample dataquestion??pls reply ASAP
> > > Hi Anil Nainwal,
> > >
> > > Sorry to bother you again.
> > >
> > > Have you checked the code I sent to you yesterday??I really
> > hope that you could find out the problem that i'm facing right now.
> > >
> > > Best regards.
> > >
> > > Chuan Chew
> >
> >
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