[ibis-macro] Re: Samples per bit for AMI

  • From: Scott McMorrow <scott@xxxxxxxxxxxxx>
  • To: ckumar@xxxxxxxxxxx
  • Date: Wed, 28 Sep 2011 20:26:41 -0400

I violently agree!

Scott McMorrow
President
Teraspeed Consulting Group LLC
(401) 284-1827
 On Sep 28, 2011 8:23 PM, "ckumar" <ckumar@xxxxxxxxxxx> wrote:
> Fixing samples ber bit is a bad idea and encourages poor
> modeling/programming practice.
>
> The model has to take its input as continuous waveform and do any
> resampling inside the model as real devices do.
>
>
> On Wed, 28 Sep 2011 23:41:19 +0000, "Muranyi, Arpad"
> <Arpad_Muranyi@xxxxxxxxxx> wrote:
>> Hello everyone,
>>
>> I ran across yet another model today which was misbehaving
>> in our tool because it turned out that it would only work
>> with 64 samples per bit and the user unaware of this used a
>> different value.
>>
>> When I wrote about this topic some time ago, I was wrestling
>> with another AMI model that would only work with 32 samples
>> per bit. Neither of these models came with any documentation
>> on what samples per bit settings they will work with. The
>> problem is that when such models are misbehaving, all kinds
>> of "fun stuff" is starting to happen, anywhere from crashes
>> to explosions :-).
>>
>> I believe that the most robust solution would be to add a
>> reserved parameter for samples per bit to the IBIS-AMI
>> specification so that the model makers would be forced to
>> document in the .ami parameter file sampling rate(s) the
>> model will work with. Making blanket statements in the spec
>> is not going to guarantee that the model maker will actually
>> do anything about it, they may not even read that part of
>> the specification at all...
>>
>> Please look over the attached BIRD draft in which I attempt
>> to solve this problem by adding a reserved parameter to the
>> specification.
>>
>> Questions, comments are welcome.
>>
>> Thanks,
>>
>> Arpad
>> ==============================================================
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