RE: [IBIS-Users] Which IBIS version to use???

That's good insight into the minds of EDA vendor.  Thanks, Weston.
 
Thanks,
Tim

  _____  

From: Beal, Weston [mailto:weston_beal@mentor.com] 
Sent: Wednesday, July 13, 2005 5:24 PM
To: Nash, Tim J (FL51); ibis-users@eda.org
Subject: RE: [IBIS-Users] Which IBIS version to use???


Tim,
 
The list of features that any simulator supports is generally not driven by
the state of the spec, nor politics, but almost entirely economical. If a
simulator vendor finds from customer input or market research (or a wild
guess) that they can sell more licenses by including a certain feature and
the work to implement it gives a good return on invested time, then it will
happen. That's why nearly every simulator supports some features of IBIS
3.2, but not some other feature. If you are buying 100 licenses of my
favorite SI simulator and demand support for [TTgnd] before you will buy,
then it will probably be implemented in the next release. Simple as that.
 
Regards,
Weston
 

  _____  

From: Nash, Tim J (FL51) [mailto:Tim.J.Nash@honeywell.com] 
Sent: Tuesday, July 12, 2005 2:36 PM
To: Beal, Weston; ibis-users@eda.org
Subject: RE: [IBIS-Users] Which IBIS version to use???


Weston,
 
I've noticed what you are talking about.  If you look in any documentation
for ICX or Hyperlinx (I'm not sure about SpectraQuest), I don't think that
global support for any particular version of IBIS is explicitly stated
anywhere.  I'm not sure why this is.  Is it because the standard is in such
a state of flux (i.e. growth of keywords) or is the reason more political in
nature?  I know I'm speculating as to what the reason may be, but it makes
it difficult to plan any sort of analysis, when your not clearly sure of
what a tool does and doesn't support without reading the manual
cover-to-cover.  If tools said they support version 3.2, then you could rest
assured that it supported EVERYTHING in 3.2, not just KEY FEATURES of 3.2. 
 
Thanks,
Tim

  _____  

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Beal, Weston
Sent: Tuesday, July 12, 2005 5:06 PM
To: ibis-users@eda.org
Subject: RE: [IBIS-Users] Which IBIS version to use???


Tim,
 
Since IBIS 2.1 I've not seen any simulator that support and utilizes all
keywords and parameters of any version of the IBIS spec. You need to
evaluate what aspects of the IBIS spec apply to your I/O pins and use those
appropriate keywords. Then you specify the IBIS version of the file to be
the lowest number that includes the features you've used. Throughout this
process you should read the latest version of the specification since it
will be the clearest and most complete description of the various features.
 
Even though ICX might not explicitly state that it supports IBIS 4.1, it
does support the [external model], [external circuit], [node declaration],
and [circuit call] keywords quite well. Check the ICX modeling guide for
slight differences from the official IBIS syntax.
 
Regards,
Weston
 

  _____  

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf
Of Nash, Tim J (FL51)
Sent: Tuesday, July 12, 2005 12:27 PM
To: ibis-users@eda.org
Subject: [IBIS-Users] Which IBIS version to use???



There seems to be some confusion among my peers as to which IBIS version we
should be working to.  The latest ANSI version appears to be 3.2, but there
are specifications available up to 4.1.  The parser available in latest
released versions of Hyperlinx and ICX is still v3.2, so I'm not sure that
Hyperlinx or ICX would even recognize v4.1 keywords.  Is there an "official"
committee recommendation of what version should be utilized in new designs -
the latest available, or the latest ANSI approved version?

Thanks in advance, 
Tim 



__________________________________ 
Timothy J. Nash, P.E. 
Honeywell, Inc. 
Defense & Space Electronic Systems 
13350 U.S. Hwy 19 N 
M/S 825-1 
Clearwater, FL  33764-7290 
Office : 727-539-2437 
Fax     : 727-539-2183 
Email  :  tim.j.nash@honeywell.com 


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