DATE: July 26, 1995
SUBJECT: 7/21/95 EIA IBIS Open Forum Meeting Minutes
VOTING MEMBERS:
AT&T Global Info Solutions Dave Moxley
Cadence Design Sandeep Khanna, C. Kumar*
Contec CAE, Ltd. Dileep Divekar*
HyperLynx Kellee Crisafulli*
INCASES Werner Rissiek, Olaf Rethmeier
Intel Corporation Stephen Peters*, Will Hobbs, Arpad Muranyi*,
Derrick Duehren
Interconnectix, Inc. Bob Ross*
Meta-Software Les Spruiell, Mei Wong, You-Pang Wei,
John Sliney
Motorola Ron Werner
National Semiconductor Syed Huq*, Atul Agarwal, Cheng-Yang Kao
NEC Hiroshi Matsumoto
Quad Design Jon Powell*
Quantic Labs Mike Ventham
Texas Instruments Bob Ward
Thomson-CSF/SCTF Jean LeBrun
UniCAD Canada Ltd. Stephen Lum
Zuken-Redac John Berrie
OTHER PARTICIPANTS:
ARPA Randy Harr
Anacad Steffen Rochel
Ansoft Henri Maramis
Atmel Corporation Dan Terry
Cadlab Ralf Bruning
Digital Equipment Corp. Barry Katz
EIA Patti Rusher
High Design Technology Michael Smith, Dr. Ing. Cosso
Hewlett Packard Tom Langdorf, Karl Kachigan, Henry Wu
IBM Jay Diepenbrock
Integrated Silicon Systems Eric Bracken
Intergraph Ian Dodd, David Wiens, Walter Katz
IntuSoft Charles Hymowitz
LSI Logic Corp. Satish Pratadneni
Mentor Graphics Ravender Goyal, Greg Doyle
MicroSim Arthur Wong
North Carolina State U. Steve Lipa, Michael Steer*
OptEM Engineering, Inc. Benny Leveille, Ken Ehn
Pacific Numerix Paul K. U. Wang
Symmetry Martin Walker
Synopsys, Logic Modeling G. Bill Lattin
VLSI Dick Ulmer*, Sung Oh*
Zeelan Technology George Opsahl, Hiro Moriyasu
In the list above, attendees at the meeting are indicated by *.
Upcoming Meetings: The bridge numbers for future IBIS teleconferences are as
follows:
Date Bridge Number Reservation # Passcode
8/11/95 (916) 356-9999 1-3150 8492193
All meetings are 8:00 AM to 9:55 AM Pacific Time. We try to have agendas out
7 days before each open forum and meeting minutes out within 7 days after.
When you call into the meeting, ask for the IBIS Open Forum hosted by Will
Hobbs and give the reservation number and passcode.
NOTE: "AR" = Action Required.
-------------------------------- MINUTES -------------------------------------
INTRODUCTIONS, ANNOUNCEMENTS
Bob Ward has left TI, so a new representative is needed.
AR - TI supply a new representative.
MINUTES REPORT, MISC.
Minutes of 6/30/95 have these corrections: correction of spelling of
Sung Oh of VLSI, correction of VLSI division name to Personal Computer
Division, and change of Contec to Contec CAE, Ltd.
AR - Bob Ross will make roster change for Contec CAE and request Roster
update information from VLSI - [DONE]
OPENS FOR NEW ISSUES
Standardizing on Unix convention on vhdl.org text files was raised by Arpad
Muranyi. Michael Steer indicated that that was the convention used for
all models, but not all files have been converted in other subdirectories
such as those for the IBIS 2.1 manual.
AR - Michael Steer make a pass at converting vhdl.org text files to Unix
convention. (AR taken by Bob Ross below)
(AR - Bob Ross will take the AR and convert all *.txt files encountered with
DOS convention to Unix Convention - [DONE] for Ver2_1.txt and ver2.0 and
ver2.1 directories)
PRESS UPDATES
IBIS mention by Savantage product highlights in Electronic Products, July
1995 pg. 61.
IBIS mention in "Delivering the High-Speed Clock: It's Not Easy To Be On
Time," EDN, July 6, 1995, pg 44.
Extensive IBIS mention and EIA IBIS discussion by Meta-Software in Design
Software Section of Electronic News, July 17, 1995, pg. 46 which included
a Meta I/O announcement of a product which provides IBIS translations to/
from Spice.
NEW MODELS
Two new models previously submitted by National for DRAM controllers have
been put in vhdl.org
Kellee Crissafulli reported that Xilinx is still considering putting their
IBIS models on vhdl.org. They are available by direct contact at this time.
Dick Ulmer reported that VLSI has not made a decision regarding putting
models under development on vhdl.org. They may want to control the
availability on a selective basis.
MODEL TRACKING
Tracking of model usage by companies such as National who have submitted
models was continued from last meetings discussion. Michael Steer said
he would work with Steve Lipa to investigate an set up a method to gather
access statistics and report back to the model provider on a monthly basis.
Who uses the models may not be clear since the anonymous password entry
may not give full information.
AR - Michael Steer (with Steve Lipa) work with systems administrators on
vhdl.org to set up a model access usage system for reporting back statistics
of model access to the model providers.
MODELS UNDER NDA
Syed Huq wants to post the availability of some IBIS models that are
available on a restricted basis or by NDA. Michael Steer indicated that
the process could done by E-mail rather than the more formal process as
documented in PROTOCOL.TXT under /pub/ibis/models in vhdl.org. Jon Powell
suggested that the information be contained in a file such as
<model_name>.txt or <model_name>.nda so that one can list all the models in
a directory by extension. The <model_name>.ibs would remain as actual IBIS
models. All information will be presented in the 00Readme file and and also
will be in the text information file(s).
AR - Michael Steer will post a process for submitting information on
models that are available on a restricted basis.
As a reminder, the best method to submit models to vhdl.org is to submit
them directly to Michael Steer (mbs@ncsu.edu). ibis-librarian@vhdl.org
mails the file to Michael.
EIA IBIS Status
Dick Ulmer indicated that VLSI sent a Purchase Order for EIA for membership
and parser. [Received by EIA, so VLSI is now a Voting Member]
There was no Treasurer's report or Ballot update.
AR - Jon Powell work with Patti Rusher concerning permission letter for
company logos.
EIA World Wide Web is running. Syed Huq is testing using the EIA IBIS
logo used for the IBIS Spoken Here signs to test the Home Page. The
committee approved using the logo and also using the EDN article for Web.
AR - Stephen Peters will work with Will Hobbs (when he returns from vacation)
to get the text of the IBIS article to Syed Huq.
Also, Syed is collecting FAQ (Frequently Asked Questions) for the Web and
will be putting them on the reflector. Michael indicated information on
posting models would be an appropriate FAQ. Kellee suggested a listing
of models. Some information should be stored at one source and referenced by
pointers rather than duplicated several places for maintainability and
accuracy. One link would be to source material in /pub/ibis on vhdl.org.
The EIA web site is up and is
www.eia.org/eng
Under this is a list of different standards. IBIS will be accessed by
searching for IBIS or by selecting EIA 656 when fully functional.
All information will be approved by the IBIS Forum prior to adding to the
Web and also must pass through EIA legal review.
AR - Syed Huq post FAQ so that they can be approved at Forum meetings.
Syed will provide html translation and submit the information to EIA system
administration who have write access to be put on the EIA Web.
GOLDEN PARSER UPDATE
Bob Ross indicated that additional work has been agreed upon and is
progressing toward finishing the ibischk2 parser. The Beta 7.1 release
is very clean and does not fail on ibis compliant syntax. The additions
are for completeness on error checking. No estimated date for completion
and redistribution is available at this time. [Update - estimate Aug 1
for completion.]
S2IBIS 2.1
Michael Steer reported on the s2ibis version 2.0 progress. It is command
command language based (versus interpreter) and is using the *.h files
of ibischk2. So it parses initially the s2ibis input file first and writes
to the data structure. The complexity IBIS Version 2.1 dictates this approach.
The analysis routines of Version 1.1 parser are planned to be included. A
working prototype is expected in several weeks with a Beta version available
in about 4 weeks. Full *.pkg modeling will not be supported.
Arpad Muranyi raised the question of aligning the VT curves. This may not
be an issue if they are all aligned with respect to a time = 0 reference.
We would have to review this to see if there is a problem.
S2IBIS 1.1
Bob Ross mentioned a problem that exists in the [Pullup] data in the region
below ground due to what appears to be an incorrect implementation of the
planned extrapolation region. He has been in communication with Steve Lipa.
The plan is to ask for a correction release S2IBIS 1.2 and also have the
correct algorithm in S2IBIS 2.1. The forum appeared in agreement in this
approach.
AR - Bob Ross communicate desired action to Steve Lipa - [Done].
COOKBOOK AND OVERVIEW UPDATE
Kellee Chrisafulli stated little response on requests, but has been capturing
tidbits of information off the reflector. His view is that some Semiconductor
companies which have been producing models might pick up the project. Syed
Huq of National said he could work with Kellee on measurement based issues.
Stephen Peters may be available in several months to help since he will be
working on an internal Intel document on IBIS. The cookbook could use
Version 1.1 as a basis. One section might address FAQ.
BIRD29.2, BANDED MATRICES
BIRD29.1 was approved by the Forum at last meeting. BIRD29.2 was proposed
as a minor addition to resolve an IBISCHK2 error checking issue that
was raised by Ron Neville. It introduces a maximum band size limit for
cases where the band is wrapped around to prevent the possibility of specifying
the same entry in two locations and possibly differently. This addition
is by just 4 additional clarification lines.
BIRD29.2 was approved by vote by the Forum.
AR - Bob Ross sends to EIA this BIRD as a comment to the EIA IBIS ballot
from the committee. Also, Bob Ross confirm with Ron Neville that this
BIRD has been approved for implementation into IBISCHK2. [DONE]
BIRD27 NEW KEYWORD FOR DIFFERENTIAL I/O
This was deferred since Bob Ward is no longer at TI as indicated above.
AR - Bob Ross submit BIRD27.1
BIRD28.1 PACKAGE MODEL EXTENSION / PHYSICAL EXTENSIONS
The discusson was opened by Stephen Peters, and based on the consideration
of example sent out and commented upon. One concludion was that the
syntax of grouped lengths had problems. The original variable length
syntax or some other approach has more promise as an approximation
approach. This is still an open issue and one of practical concern.
AR - Stephen Peters will develop and post an updated BIRD28.2 reflecting
some additional insites.
The discussion merged with the physical discription approach as one
way to give a more detailed description. Action items are:
AR - Kellee Crissfulli create and post an example of a physical description.
AR - Arpad Muranyi contact Raj Mitra at U of Illinois for possible format
input and present any useful results.
AR - Jon Powell investigate and report on EDIF formats and field solver
data bases and consideration with respect to geometric descriptions.
DIODE MODELING
This issue has been put on hold and was raised here to see what progress
has been made. Jon Powell (may) have some work that he can share and
will report it or make it available. There was brief discussion of
measurement and of whether the turn off or turn on time were the major
factors.
AR - Stephen Peter talk to Tim Schreyer for progress since the issue is
becoming visible again.
PIN PROGRAMMABLE BUFFER STRENGTHS
Arpad Muranyi opened this issue for discussion and Dick Ulmer of VLSI
indicated this is an important issue with them. A typical part may have
buffer selections at two strengths and for 5V and 3.3V supplies giving
four choices. Currently the customer needs to edit in the name of the
buffer being used in IBIS files.
Arpad listed several approaches and several more were presented during
the discussion:
(1) Include all buffers, and use an editor to insert the name into the
[Pin] list for the strength desired - a tedious editing process.
(2) List all acceptable buffers for each pin - this enlarges the [Pin]
file, and there has to be a selection mechanism.
(3) Introduce a new keyword which supports a model with multiple VI curves
and Ramp (or VT) curves in the model - need a selection method.
(4) Use #Define syntax to compile the IBIS model beforehand with the
proper buffers based on a model with multiple choices. There are
various C tools that can do this. One issue is if models can be
changed dynamically such as might be done to optimize a driver for
a certain net.
(5) Use a "[Multiple Model]" syntax under which several fully defined
[Models] can be used to define for a particular name the available
model strengths (or even different models) - There is a model
selection issue.
One question/concern by Dick is if one of the models is the default model.
AR - Arpad Muranyi write up a proposal (EGG) reflecting further thoughts.
TTL DRIVERS
Jon Powell raised as a new issue that CMOS and TTL drivers may need to be
processed differently to reach the half-on/half-off state using VI data.
This may requiring keywords for identifying the different technology.
AR - Jon Powell supply more information and possibly an egg for discussion.
NEXT MEETING:
It is set on Friday, August 11, 1995 with Will Hobbs moderating.
==============================================================================
NOTES
IBIS CHAIR: Will Hobbs (503) 264-4369, Fax (503) 264-4210
will_hobbs@ccm.jf.intel.com
Modeling Manager, Intel Corp.
2111 NE 28th M/S JF1-57, Hillsboro, OR 97124 USA
VICE CHAIR: Jon Powell (805) 988-8250, Fax: (805) 988-8259
jonp@qdt.com
1385 Del Norte Rd., Camarillo, CA 93010
SECRETARY: Bob Ross (503) 603-2523, fax (503) 639-3469
bob@icx.com
10220 SW Nimbus Ave, K4, Portland, OR 97223
To become a voting member of the EIA IBIS Open Forum, send email to
ibis-info@vhdl.org for instructions.
If you want to join the e-mail reflector (ibis@vhdl.org), send e-mail to the
IBIS secretary at ibis-request@vhdl.org.
Check the pub/ibis directory on vhdl.org for more information on previous
discussions and results. You can get on via ftp anonymous, "guest" login from
telnet or dial-in (415-335-0110), or send an email request to the automatic
archive server, archive@vhdl.org.
"IBIS Spoken Here" placards are available from Jon Powell (jonp@qdt.com) for
use at trade shows.
==============================================================================
Received on Wed Jul 26 09:07:26 1995
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