[ibis-macro] Re: FW: [IBIS] BIRD119: IBIS-AMI New Reserved Parameters > initial feedback
- From: "Todd Westerhoff" <twesterh@xxxxxxxxxx>
- To: "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 12 Oct 2010 10:05:12 -0400 (EDT)
Ken,
Thanks for your comments.
The BIRD was submitted to the IBIS Open Forum so that everyone would have
a convenient way to refer to the document. With multiple BIRDs being
discussed in the Tuesday meetings, we wanted to be sure that there was a
simple and unambiguous way to refer to this one. We always expected the
bulk of the technical discussions to occur in the Tuesday IBIS-ATM
meetings.
Your other notes are good discussion points for the IBIS-ATM meetings.
The technical background behind some of these points is fairly involved,
so it's better suited for a real-time discussion than a yet another really
long email thread that no one has the time to read. ;-)
Talk to you this afternoon,
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 Ken Willis
Sent: Monday, October 11, 2010 11:44 AM
To: 'IBIS-ATM'
Subject: [ibis-macro] FW: [IBIS] BIRD119: IBIS-AMI New Reserved Parameters
> initial feedback
Hello all,
We have several issues with this BIRD. The first is the process. It is
unclear why this large BIRD would go straight to the IBIS Open Forum
instead of first pass through the IBIS-ATM committee. Many items in here
have significant implications that need to be considered. Is the intent to
simply introduce it at the Open Forum, but still review in IBIS-ATM?
Beyond that, there are some important technical items that raise concern:
- The section on "Data Management / Sim Control" has some good
ideas in it. We think this should be moved into its own BIRD, instead of
lumped together with all this other content.
- A fundamental disagreement is with the Broadband and Equivalent
Circuit Analog Model sections. From the beginning of the AMI effort
several years back, a very clear distinction was introduced between the
"circuit" part of the problem, which is involved in the initial impulse
response characterization, and the "algorithmic" part of the problem,
which was on-chip content that focused on the equalization. But here it
appears the authors are pushing the circuit modeling into AMI as well. We
think that is the WRONG direction. Traditional IBIS already has
functionality to handle the circuit part of the problem. External Model
syntax today can fully handle the parameterized subcircuit functionality
proposed here with the "Equivalent Circuit Analog Model", and is confusing
and extraneous here. Adding support for S-parameters is an excellent move,
but BIRD 116 to add ISS to External Model completely takes care of this.
The AMI portion of IBIS should be exclusively focused on the on-chip
equalization modeling, and not redundantly re-define circuit modeling of
traditional IBIS/External Model.
- The remaining content focuses on jitter/noise. It makes sense
to put this into its own BIRD, and we support this discussion
wholeheartedly. But again we sense a fundamental issue here. The original
AMI spec defined "Reserved_Parameters" and "Model_Specific' parameters.
The former was for the EDA tool, and the latter is obviously for the
specific model. But there are several of the proposed new
Reserved_Parameters that should be associated with the specific model
instead of generically to the EDA tool. A good example of this is
Sj-related items. This is directly tied to how the model developer
implements their CDR functionality in the algorithmic model, and not
universally to EDA tools. So this section looks promising, but needs
significant review before it should leave the IBIS-ATM committee and go to
the Open Forum.
We look forward to discussing these items Tuesday.
Thanks,
Ken Willis
Sigrity, Inc.
860-871-7070
kwillis@xxxxxxxxxxx
_____
From: owner-ibis@xxxxxxx [mailto:owner-ibis@xxxxxxx] On Behalf Of Mirmak,
Michael
Sent: Wednesday, October 06, 2010 11:54 AM
To: ibis@xxxxxxxxxxxxxx
Subject: [IBIS] BIRD119: IBIS-AMI New Reserved Parameters
The enclosed BIRD 119, IBIS-AMI New Reserved Parameters, is distributed on
behalf of Walter Katz, Mike Steinberger and Todd Westerhoff of SiSoft. It
will be introduced at the next IBIS Open Forum meeting.
A full list of BIRDs, their status and association with particular IBIS
versions may be found at http://www.eda.org/ibis/birds/.
Please note that the enclosed file is a "pointer" to a separate PDF file
of the BIRD text, as the IBIS e-mail reflector does not permit
redistribution of binary files. The enclosed file is identical to the
ASCII file on the BIRD list at the URL above. The complete BIRD text is
available at:
http://www.eda.org/ibis/birds/bird119/bird119.pdf
Michael Mirmak
Intel Corp.
Chair, IBIS Open Forum
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