DATE: March 11, 1997
SUBJECT: 3/07/97 EIA IBIS Open Forum Minutes
VOTING MEMBERS AND 1997 PARTICIPANTS LIST:
AMP Jeff Walden
Applied Simulation Technology Dileep Divekar*, Norio Matsui
Cadence Design C. Kumar*, Don Telian
Cypress Bruce Wenniger
Digital Equipment Corp. Jeff Chu*
Hewlett Packard, EEsof Karl Kachigan, Henry Wu
HyperLynx Kellee Crisafulli
INCASES Olaf Rethmeier*
Intel Corporation Stephen Peters*, Arpad Muranyi*,
Interconnectix Bob Ross*
Mitsubushi Tam Cao
Motorola Ahmed Omer
National Semiconductor Syed Huq*, Cheng-Yang Kao, Mike Bristol,
Peter Laflamme, Kevin Smith,
NCR Dave Moxley*, Richard Mellitz
NEC (Hiroshi Matsumoto)
Quad Design/Viewlogic Jon Powell, Chris Rokusek*
Quantic Laboratories (Mike Ventham)
Texas Instruments Thomas Fisher
Thomson-CSF/SCTF (Jean LeBrun)
UniCAD Canada Ltd. (Celso Faia)
Veribest Ian Dodd
VLSI Technology Harish Patel, D.C. Sessions,
Zuken-Redac (John Berrie)
OTHER PARTICIPANTS IN 1997:
3M Fran Hart
Actel Scott Schlachter
Acuson & Free Model Foundation Richard Munden
Alcatel John Fitzpatrick
Ansoft Eric Bogatin
Apteq Design Systems Dan FitzPatrick
Compaq Weston Beal
EIA Patti Rusher*
EMC Fabrizio Zanella
Micron Technology Brian Johnson
Molex Gus Panella
North Carolina State U. (Michael Steer)
S3, Inc. Porsh Shih, Sarathy Sribhashyam
Ultratest International Charles Im
Zeelan Technology George Opsahl
In the list above, attendees at the meeting are indicated by *. Principal
members or other active members who have not attended are in parentheses.
Participants who no longer are in the organization are in square brackets.
Upcoming Meetings: The bridge numbers for future IBIS teleconferences are as
follows:
Date Bridge Number Reservation # Passcode
3/28/97 (916) 356-9200 2-133309 2774522
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 AND MEETING QUORUM
Jeff Chu reported that Digital Equipment Corporation is a full EIA/IBIS
member.
MEMBERSHIP UPDATE AND TREASURER'S REPORT
Patti Rusher shows $10,129 in the EIA/IBIS account, with about $6,500 in
1997 membership dues pending. She listed the members still owing payment.
REVIEW OF MINUTES AND AR'S
No Changes.
MISCELLANY/ANNOUNCEMENTS
Bob Ross reported that the presentations from the EIA/IBIS Summit meeting of
January 20, 1997 are now available on vhdl.org under:
ftp://vhdl.org/pub/ibis/summits/summit97
Also, the draft Version 3.0 of IBIS has been updated in the /pub/ibis/wip
directory to ver3_0f.ibs to include the most recently passed BIRDs.
PRESS AND WEB PAGE UPDATES
Bob Ross reported that Applied Simulation Technology's IBIS products are
mentioned on page 69 of Printed Circuit Design, March 1997 under PCB Design
Conference West Product Preview.
Syed Huq reported that he has completed converting his Electronic Design
article to HTML, and he will be mailing it on to Patti Rusher to be put on
the EIA/IBIS home page.
He will establish a link to the s2ibis utility available through the VeriBest
home page. He has received permission to copy an HTML version of the IBIS
Cookbook from Andreas Thiel of Zurich, Switzerland.
Finally, an HTML version of the IBIS roster will be available which will
have direct e-mail address links. Syed reported that the text version will
still be available on vhdl.org/pub/ibis/roster for easier downloading. Bob
and Syed will keep in sync on roster changes.
NEW MODELS AVAILABLE, LIBRARY UPDATE
[Syed Huq reports after the meeting that National Semiconductor has released
two IBIS models which are 3.3V LVDS line drivers and receivers: ds901v031.ibs
and ds901v032tm.ibs. These are available on the National model site.]
Chris Rokusek reported working with Texas Instruments on a question
concerning the test load for timing for a differential pin. Ideally, the
load should be differential. However, IBIS supports only single-ended
Thevenin equivalents. Bob Ross suggested a possible "Rdiff" test load might
be preferred. However, both Bob and Chris reported good results with the
single-ended load currently in place.
Bob reported that Cypress Semiconductor with plans to make IBIS models
available in the future under a new page:
http://www.cypress.com/tech_sup/web_tech/ibis_top.html
A new mpc2605.ibis model is now available under the Motorola Power PC section
of the Motorola IBIS models. Also Motorola now lists direct links (although
not working yet) to their FAST SRAM IBIS models:
http://www.mot.com/SPS/FastSRAM/models/IBIS.html
OPENS FOR NEW ISSUES
Bob Ross on ground/power bounce model extensions (not discussed)
DESIGN AUTOMATION CONFERENCE 1997 IBIS MEETING PLANNING
Patti Rusher asked if the IBIS Summit meeting will be held all day on
Thursday, June 12, 1997 and received confirmation. The deadlines for poster
information to be sent to the graphic artist is March 21. Bob Ross will ask
Jon Powell if he can help with this. Patti will be sending by express mail
the necessary information. We expect IBIS literature to be distributed at
the Conference.
INTERNATIONAL PROGRESS
Patti Rusher stated that Greg Ledenbach of Sematech has provided this update:
IBIS, Version 2.1 NP (New work item Proposal) (93/46/NP) passed with 6 out of
6 voting members and prepared to participants. For reference, four out of
the five NPs passed.
EIA JAPAN I/O INTERFACE MODEL PROPOSAL
Bob Ross reported that a committee meeting is planned, Wednesday, March 19,
1997 at the Santa Clara Convention Center during the PCB West Design
Conference. The purpose is for Electronic Industries Association of Japan
(EIAJ) Committee Chair Hideki Fukuda from Hitachi to present "Standard for
I/O Interface Model", Draft Version 0.0. Several IBIS Committee participants
have expressed interest and have been mailed a copy. There will be room for
a few more interested IBIS participants who are attending the PCB Conference
but please let Bob know beforehand. Current invited participants are:
Bob Ross, Interconnectix
Syed Huq, National Semiconductor
Jon Powell, Quad Design/Viewlogic
Will Hobbs, Intel
Patti Rusher, EIA
Stephen Peters, Intel
Dileep Divekar, Applied Simulation Technology (USA)
C. Kumar, Cadence
Shinichi Maeda, KAW/USA
Patti Rusher has scheduled the Bayshore West Room from 8 A.M. to 2 P.M. for
about 15 people at the Westin Hotel which adjoins the Convention Center. Bob
plans the actual meeting to start at 9 AM. Refreshments will be provided.
Bob and Fukuda-san will be developing the schedule.
In a note to Bob, Fukuda-san outlined his general expectations for the EIAJ
activity:
Draft Version 0.0:
Get CAE Vendor support and cooperation from the EIA/IBIS Open Forum.
Draft Version 1.0:
Get Semiconductor Company Commitment.
Draft Version 2.0:
Get Customer support and model providers and processors produce systems
to support the Specification.
Release:
Release hopefully by the end of the year.
Stephen Peters asked who was behind the EIAJ activity, and Bob responded that
a group of 17 Japanese companies (including Japanese representative from some
American companies). Patti asked if the draft should be forwarded to IEC,
but Bob responded that the proposal was not ready yet. There is a potential
problem with forwarding overlapping standards. Bob indicated that he felt
the effort had a number of distinct elements to set it apart from IBIS, and
he expected that IBIS will continue along its current course. C. Kumar noted
that multiple standards are expensive for the industry and also noted that
IBIS and EIAJ activities could have some overlapping package models.
ELECTRONIC DESIGN REPRINTS
As previously noted Syed Huq is posting an HTML electronic copy of his article
"Ease System Simulation With IBIS Device Models" published in the December 2,
1996 issue of Electronic Design on the EIA/IBIS Home page. Hardcopies are
useful for handouts at shows, particularly at DAC97. Bob Ross indicated that
the reprints cost:
100 $2010
500 $2215
1000 $2715
Bob proposed that the EIA/IBIS Open Forum purchase 1000. However, Patti
Rusher and Stephen Peters felt that 500 would be adequate.
By unanimous consent, the Open Forum voted to purchase 500 copies.
AR - Syed Huq contact Patti Rusher with information on purchasing the reprints.
Syed noted that he will send back about 150 copies of the older 1995 EDN
article to Patti to also be used at shows along with the ED article reprints.
ROSTER UPDATE
Syed Huq and Bob Ross are coordinating roster updates. The new roster has
five non-EIA/IBIS member companies deleted who have not responded.
Syed volunteered to work on the contacts.txt list to update it and to produce
an HTML version.
IBIS COOKBOOK PROGRESS
Stephen Peters states that an internal version is nearing completion, and he
will be reviewing it shortly. He needs to sanitize it by taking out Intel-
specific information before releasing it. He requested Chris Rokusek to
provide him the test load information for waveforms for inclusion.
Bob Ross indicated that this will be valuable tutorial material in response
to some recent reflector discussion.
BIRD41.1 - MODELING SERIES SWITCHABLE DEVICES
Bob Ross had indicated that the author of BIRD41.1, John Fitzpatrick, was on
vacation. So Bob went over BIRD41.1 in some detail, both for explanation
and also to raise some technical concerns. Some of the points are presented
here.
BIRD41.1 Consists of two additions:
Under [Component], [Series Pin] is defined to associate two pins with a
series model.
Under [Model], two new Model_types (Series, and Series_switch) are
defined. Several Series keywords are introduced to provide the electrical
description.
BIRD41.1 handles both discrete series elements (series diodes, resistors,
capacitors, etc. and also series switches such as represented by the Texas
Instruments CBT technology and by the Quality Semiconductor Quick Switch
technology. In fact, these devices should drive what features are included
in BIRD41.1 for series switch elements.
Regarding the [Series Pin], under [Component], Bob had these points:
1. Is non-symmetrical operation really needed? It will lead to problems
in other areas.
2. The State table syntax needs to be standardized and restricted. "OFF",
"ON" and "NA" may be restricted suggestions. However, a more general
grouping method may be needed to relate to "Function Table" states.
3. The data books give "Function Table" logic descriptions of the
components. The Series_switch is a case where IBIS should embed some
of the logic choices in the model to reduce, in most cases, the
combined OFF-ON permutations. This is discussed later.
Regarding the [Model] keyword additions:
1. Just [Rseries], [Lseries], and [Cseries] are needed. The proposed
[R_c_series], [L_c_series] and [R_l_series] additions are unnecessary.
All series elements should be allowed to be connected in series, just
as the "Terminator" model elements (such as [Rpower], [Rgnd], [Gnd
Clamp], [Power Clamp and [Rac]&[Cac]) can all be used in one [Model]
and connected in parallel.
2. The [Series Impedance] table can also be connected in series.
3. The [Series Impedance] table could be defined with a voltage range
of -Vcc to Vcc for closed switch operation or low impedance, It could
also have a range from -2Vcc to 2Vcc for open operation. So its range
needs to be defined. The full ranges take care of Pin1-to-Pin2 and
Pin2-to-Pin1 non-symmetrical operation.
4. R_load is not needed.
5. Also the Mode subparameter could be dropped. This could be handled
another way for actual switches. One suggestion for Series_switch
devices might be to introduce an [On] and an [Off] set of keywords
under which the two states are described. The simplest description
can be done by just using low and high values of [Rseries].
Some general comments are:
1. The [Pin] keyword is still required as part of the [Component] pinout
description.
2. There is no restriction on possible [Pin] model descriptions including
GND, POWER, NC when the pin is also listed as a series pin. This is a
potential advantage since the [Pin] model itself could still be used
for describing any clamping structure for protection on the correct
pin. Drivers could be put on one side. The package description methods
and all possible extensions under the [Pin] structure remain unchanged.
There are some questions:
1. What does C_comp mean in a series model?
2. Should a Series Pin be used to connect to a supply or ground, as
proposed above?
3. Should the Series Pins be used for Differential terminations?
4. Can several different series pin models be connected to the same pin?
The final discussion consisted of elaborating on the "Function Table" for
series switches, as described in data books. Bob illustrated the need for
such a Function Table to allow the user interface or simulator controlled
operation to provide only the switch combinations that the device actually
supports (rather than all possible switch setting permutations of the
component). Several Components were used as examples:
1. TI SN74CBT3125 Quadruple Bus Switch has 4 independent switches which
can be turned ON or OFF - 16 combinations.
2. TI SN74CBT3245 Octal Bus Switch has 8 dependent switches, all OFF or
all ON - 2 combinations.
3. TI SN74CBT3244 Octal Bus Switch has 8 switches of 2 groups of 4
dependent configurations where each group can be OFF or ON - 4
combinations.
4. Quality QS3251 QuickSwitch 8:1 Mux/Demux has 8 switches which can be
all OFF or configured with only one switch to be ON at a time to
connect one of 8 lines to a second pin - 9 combinations.
5. TI SN74CBT3383 10 Bit Bus-Exchange Switch describes 5 sets of exchange
switches which ALL either connect-directly two lines, cross-over-
connect two lines, or provide no connections - 3 combinations.
6. (Not discussed was a case such as the TI SN74CBT6800 with 10 switches
for direct connection and 10 switches for precharge bias, ALL of which
are synchronized - 2 combinations.)
Arpad Muranyi raised the issue whether BIRD41.1 should capture the dynamic
turn-on and turn-off characteristics of a switch. Bob suggested that there
was sufficient complication already without this addition. Also, Bob was
not aware of a defined need. Furthermore Arpad questioned whether the group
switching was too much of a "logic" issue to be in IBIS. Bob stated that a
form of group change logic was already approved in Arpad's BIRD30.2 for
Switching Buffer Models. Arpad wondered if IBIS should extend into Analog
and Mixed Signal domains. However, someone stated that this would enter the
domain where HDL languages exist. C. Kumar stated that the mission of IBIS
should be where IBIS is best positioned - a higher level behavioral modeling
format for analog interface analysis. Bob agreed.
Steve Peters indicated that he had worked with designs using series switches.
Dave Moxley also indicated that he has used series switches. He stressed the
need for a good user interface since the current way he describes series
switches is to manually change the values of series resistors.
Arpad questioned whether some existing table keywords should be re-used, and
Bob responded that, in his opinion, it was better to define a new keyword if
there was any difference in usage.
AR - Bob Ross write up the comments regarding BIRD41.1. Bob also work with
John Fitzpatrick concerning any changes.
PACKAGE COMMITTEE REPORT
Stephen Peters stated that Jon Powell did not receive all of the Connector
Spice model and matrix information, and that he will be delayed in doing
the planned Spice and matrix model correlation study. He expects to produce
a proposal which includes syntax for allowing a smaller model subsection to
describe a full connector model, if possible. The next Package Committee
meeting is scheduled for Friday, March 14, 1997.
BIRD36.1 - ELECTRICAL DESCRIPTION OF BOARDS
Stephen Peters received Bob Ross' comments. He generally agrees with the
technical comments including that a Pin can exist only once as part of a
path description in the file.
AR - Stephen Peters issue BIRD36.2 with the suggested changes. [Done]
Bob proposed with Stephen's concurrence that BIRD36.2 would be scheduled for
a vote at the next meeting.
VERSION 3.0 FUNCTIONALITY
Stephen Peters questioned what will be in Version 3.0, and Bob Ross briefly
stated that the planned functionality includes all approved BIRDs and these
pending proposals: BIRD36.2, a connector model BIRD, and possibly BIRD41.x.
Also last-minute possibilities are early clamps and some more ground/power
bounce details. Bob hopes that we can target the DAC97 meeting in June
(or the meeting before) for final closure of all issues and for Version 3.0
ratification.
C. Kumar raised the issue of correlation of IBIS simulations with Spice
simulations. Syed Huq indicated that aside from ApsimIBIS from Applied
Simulation Technology, there were no utilities that could produce Spice
models from IBIS models. (Avanti! - Meta-software has withdrawn from the
market.) Dileep Divekar indicated that ApsimIBIS produces Spice models
compatible ApsimSpice only. Bob Ross deferred the correlation discussion
and IBIS to Spice tool generation issue to the next meeting.
MODELING EARLY CLAMPS IN IBIS
Arpad Muranyi reported that at this time he has focused his initial research
(with assistance from C. Kumar) on describing appropriate measurements for
electrical description. The formatting details are not the difficult issue.
He is planning a BIRD proposal for Version 3.0.
PARSER STATUS
Chris Rokusek plans to send his ibischk2 extensions to resolve BUGs 5-7 to
Bob Ross for posting on vhdl.org. Only the executables will be posted since
the source code is available only through purchase of a license. After some
testing by the users, Chris may provide the enhanced code as the new base-
line for future ibischk3 development for Version 3.0 of IBIS.
BUG8 - RESERVED WORDS USED AS PINNUMBERS GENERATE ERRORS
Bob Ross indicated that BUG8 has been in existence since the first ibis_chk
parser. The IBIS specification could be interpreted to mean that this is
not a bug. Bob did not recommend changing the parser at this time, but
rather to classify it as an annoyance, with no fix. There are easy work-
arounds. Stephen Peters proposed that BUG8 be fixed as part of the Version
3.0 ibischk3 development project.
After some brief discussion, everyone concurred by unanimous vote that BUG8
will be fixed in ibischk3.
Bob noted that the current release of s2ibis2_ver1.1 contains examples which
has "gnd" as the IBIS file pin number, and this will generate an ibischk2
error message.
NEXT MEETING:
The next meeting is on Friday, March 28, 1996, 8:00 A.M. to 9:55 A.M.
BIRD36.2 is scheduled for a vote.
==============================================================================
NOTES
IBIS CHAIR: Bob Ross (503) 603-2523, Fax (503) 639-3469
bob@icx.com
Modeling Engineer, Interconnectix
10220 SW Nimbus Ave, K4, Portland, OR 97223
VICE CHAIR: Syed Huq (408) 721-4874, Fax: (408) 721-4785
huq@rockie.nsc.com
Staff Applications Engineer, National Semiconductor, M/S A-2595
2900 Semiconductor Drive, Santa Clara, CA 95052
LIBRARIAN: Jon Powell (805) 988-8250, Fax: (805) 988-8259
jonp@qdt.com
Transmission-Line Products Manager, Quad Design/Viewlogic
1385 Del Norte Rd., Camarillo, CA 93010
SECRETARY: Vacant
This meeting was conducted in accordance with the EIA Legal Guides and EIA
Manual of Organization and Procedure.
The following e-mail addresses are used:
ibis-request@vhdl.org
To join, change, or drop from either the IBIS Open Forum Reflector
(ibis@vhdl.org), the IBIS Users' Group Reflector (ibis-users@vhdl.org)
or both. State your request.
ibis-info@vhdl.org
To obtain general information about IBIS, to ask specific questions
for individual response, and to inquire about joining the EIA-IBIS
Open Forum as a full Member.
ibis@vhdl.org
To send a message to the general IBIS Open Forum Reflector. This
is used mostly for IBIS Standardization business and future IBIS
technical enhancements.
ibis-users@vhdl.org
To send a message to the IBIS Users' Group Reflector. This is
used mostly for IBIS clarification, current modeling issues, and
general user concerns.
ibischk-bug@vhdl.org
To report ibischk2 parser bugs. The Bug Report Form Resides on
vhdl.org in /pub/ibis/bugs/bugform.txt along with reported bugs.
Information on IBIS technical contents, IBIS participants, and actual
IBIS models are available on the IBIS Home page found by selecting the
Electronic Information Group under:
Check the pub/ibis directory on vhdl.org for more information on previous
discussions and results. You can get on via ftp anonymous, or send an e-mail
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 Tue Mar 11 08:54:46 1997
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