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

  • From: "Todd Westerhoff" <twesterh@xxxxxxxxxx>
  • To: "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>
  • Date: Thu, 29 Sep 2011 13:00:04 -0400 (EDT)

Je suis d'accord.

 

Todd.


-- 

Todd Westerhoff
VP, Software Products
SiSoft
6 Clock Tower Place, Suite 250
Maynard, MA 01754
(978) 461-0449 x24
twesterh@xxxxxxxxxx
www.sisoft.com

 

From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Thursday, September 29, 2011 9:50 AM
To: IBIS-ATM; ibis-macro-bounce@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: Samples per bit for AMI

 

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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