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

  • From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
  • To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>, "ibis-macro-bounce@xxxxxxxxxxxxx" <ibis-macro-bounce@xxxxxxxxxxxxx>
  • Date: Thu, 29 Sep 2011 13:50:23 +0000

Greg,

I envisioned that this parameter would tell the EDA tool
how it should generate the waveform that it passes to
the AMI DLL (i.e. how many points per bit should be in
the waveform).  I think this is like the model telling
the tool:  "Give the data to me this way, because I can't
handle it any other way".

Thanks,

Arpad
==========================================================

From: Gregory R Edlund [mailto:gedlund@xxxxxxxxxx]
Sent: Thursday, September 29, 2011 8:32 AM
To: Muranyi, Arpad
Cc: IBIS-ATM; ibis-macro-bounce@xxxxxxxxxxxxx
Subject: Re: [ibis-macro] Samples per bit for AMI


Arpad,

Do you envision the new samples per bit parameter being used by the EDA tool?  
Or is it for documentation purposes?

There is another way to handle this scenario:  we could integrate samples per 
bit into the quality check list, i.e. the model maker uses the quality check 
list as a means of communication with the user.

Greg Edlund
Senior Engineer
Signal Integrity and System Timing
IBM Systems & Technology Group
3605 Hwy. 52 N  Bldg 050-3
Rochester, MN 55901



[Inactive hide details for "Muranyi, Arpad" ---09/28/2011 06:44:32 PM---Hello 
everyone, I ran across yet another model today whi]"Muranyi, Arpad" 
---09/28/2011 06:44:32 PM---Hello everyone, I ran across yet another model 
today which was misbehaving

From: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
Date: 09/28/2011 06:44 PM
Subject: [ibis-macro] Samples per bit for AMI
Sent by: ibis-macro-bounce@xxxxxxxxxxxxx

________________________________



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
==============================================================



[attachment "SamplingRateBIRD_01.pdf" deleted by Gregory R Edlund/Rochester/IBM]

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