DATE: February 18, 1997 SUBJECT: 2/14/97 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 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 Digital Equipment Corp. Jeff Chu* 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. Note, refer to the January 10, 1997 minutes for the last listing of the 1996 IBIS Open Forum participants. Upcoming Meetings: The bridge numbers for future IBIS teleconferences are as follows: Date Bridge Number Reservation # Passcode 3/7/97 (916) 356-9200 3-87786 1568848 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 George Opsahl, a long time participant from Zeelan Technology, joined the discussion. MEMBERSHIP UPDATE AND TREASURER'S REPORT Patti Rusher reports that Meta-Software (now Avant!) has canceled their membership. IBM will not be joining. So the membership is currently 22, but most bills are still outstanding. There will be some changes due to changing interests and some business purchases and mergers. The DAC97 participation will be deducted from the 1996 funds. Patti will supply Bob Ross current treasury status, but predicts about $10,500 income this year from membership dues. Dave Moxely asked clarification that the membership rate is $500.00 this year even if the company had purchased the IBIS_CHK2 source code license in the past. The parser/membership discount of $750.00 still applies for joint membership/parser licenses for the year of the purchase. Patti needs to supply Bob the current financial information since the last showed $9,285 in the IBIS account. REVIEW OF MINUTES AND AR'S Minutes corrections submitted privately include the following: Minor text corrections. Harish Patel spelling correction from Hrish for VLSI. Sri Jandhyala removal from Texas Instruments contacts, roster, participants list due to responsibility change. Mike Bristol from Bristi for National Semiconductor. Sarathy Sribhashyam from Jarathy Jribhashyam for S3, Inc. MISCELLANY/ANNOUNCEMENTS None. PRESS AND WEB PAGE UPDATES Syed Huq reports miscellaneous logo and company Web page link updates on the EIA/IBIS Home page Poster selection (Quantic/EMC and Applied Simulation Technology). Syed also reports that "Apsim Models IC Packages" on pg. 56 of the February 10, 1997 issue of EE Times describes Applied Simulation Technology's ApsimIBIS products for package coupled-matrix LRC extraction and IBIS to Spice conversions. NEW MODELS AVAILABLE, LIBRARY UPDATE Bob Ross reported that the Free Model Foundation has removed their models, but plans to have some new ones shortly. OPENS FOR NEW ISSUES Bob Ross for the new North Carolina State University s2ibis2 Version 1.1. REVIEW OF SUPERCON97 IBIS SUMMIT MEETING Syed Huq reported that it was a good meeting with a lot of interesting topics, and with over 35 people attending. Syed and Jon Powell will be posting the electronic copies of the presentations. Bob Ross asked that he be given copies since he will post them in a summit97 directory where he is owner. The minutes of the meetings are also stored in that directory. Syed and Jon can still work on any possible visible copies. AR - Syed Huq supply Bob Ross with electronic copies. DESIGN AUTOMATION CONFERENCE 1997 IBIS MEETING PLANNING Patti Rusher asked what day the IBIS Summit meeting will be held so she can reserve a room. Bob Ross suggested Thursday, June 12, 1997 because it is the day after the trade show portion closes. DAC97 will be held in Anaheim, California. Patti indicated that a Poster will be needed. Bob hopes to off-load this project. INTERNATIONAL PROGRESS Patti Rusher reported that IBIS did not pass international standardization at the last IEC TC93 US TAG meeting because only three countries agreed to work on the proposal per fast track. She is still pursuing getting five countries interested and expects to be successful because of some recent organizational changes. EIA JAPAN I/O INTERFACE MODEL PROPOSAL Bob Ross reported that he had just received a FAXed copy of the Electronic Industries Association of Japan (EIAJ) "Standard for I/O Interface Model", Draft Version 0.0. Committee Chair, Hideki Fukuda from Hitachi, does not want this draft circulated to the public at this time. Instead, he has proposed meeting with Bob and/or appropriate representatives of the EIA/IBIS Open Forum to investigate future areas of cooperation. Bob commented that that this is a well-written, Postscript formatted document. It is a copyrighted document, so Bob is seeking permission to provide copies to the EIA/IBIS Open Forum officers for review. Based on a quick reading, Bob provided a brief overview and his initial observations. The document was developed by a committee with representatives from seventeen Japanese companies. It was designed to extend IBIS Version 2.1 and contains the IBIS-style keyword syntax. It has a nice partitioning of a part into IC, Package, and Module Board portions. It also has a functionality level structure: Level 1 for Signal Integrity, Level 2 for Power Integrity (ground and power bounce) and Level 3 for EMI (requiring shape information). For comparison and positioning of the proposal, Bob feels that IBIS Version 2.1 is Component-centric with special application to large-sized Board-Level analysis. The Japanese proposal is more IC-centric with Spice-centric extensions to handle internal details including the electrical representation of internal metalization within an IC. With detailed internal power/ground/buffer electrical interconnection, more accurate power integrity analysis is possible. One example shows two adjacent ground pins modeled by splitting the electrical inductances between the two pins. This type of detail goes beyond what can be provided by the existing [Pin Mapping] keyword. Some standard Spice syntax is included to describe passive elements. A set of table-based behavioral MOS transistor and diode extensions are included, which Bob believes would be extensions to most, if not all Spices (this needs to be checked further). This behavioral approach gives additional accuracy, while at the same time, does not require revealing actual proprietary process information. Hideki Fukuda has suggested a March visit, and Bob is suggesting that an appropriate time and location may be centered around the PCB Design Conference in Santa Clara, California, March 18-20, 1997. Based on this discussion, the sense of the Forum is to proceed with further discussion. The EIA/IBIS Open Forum officers along with several other individuals expressed interest and volunteered to be part of the group for future discussions and advice: Bob Ross, Interconnectix Syed Huq, National Semiconductor Jon Powell, Quad Design/Viewlogic Dileep Divekar, Applied Simulation Technology (USA) Stephen Peters, Intel Bob will work out scheduling with Hideki Fukuda. ELECTRONIC DESIGN REPRINTS Syed Huq has received permission to post the article he published "Ease System Simulation With IBIS Device Models" in the December 2, 1996 issue of Electronic Design on the EIA/IBIS Home page. He is currently converting it to HTML format. Syed also raised the issue of whether the EIA/IBIS Forum should purchase reprints according to the following price schedule: 100 $2010 500 $2215 1000 $2715 They would be used as trade show handout material (particularly for DAC97) along with some remaining copies of the 1995 EDN IBIS article. Patti Rusher indicated that at least 500 copies would be needed. Bob Ross questioned whether National Semiconductor is interested in sharing the expense by purchasing some copies for National distribution. Syed will find out, and the purchase decision will be deferred until next meeting. ROSTER UPDATE Because of the acquisitions, mergers, and changing directions and personnel that is characteristic of our industry, the roster.txt document needs to be updated. Syed Huq volunteered to gather the new information by sending the current roster.txt out on the ibis@vhdl.org reflector. Please review your entries and make any changes or corrections. Also, we would like to know if the EDA vendors support IBIS as a native model input (with translation to another model format), and whether the vendor can read IBIS Version 2.1 level files (versus IBIS Version 1.1). We would like to see which silicon vendors produce IBIS models, and we would like to see which users also create or make use of IBIS models. Anyone who is involved with IBIS in any way is invited to submit roster.txt information to Syed for their organization. Use the existing roster.txt to provide the format for your entry. Official EIA/IBIS Open Forum Member organizations will always be retained on the roster. If no response is received for non-member organizations, the existing entry will be deleted. This is our way of removing obsolete references. AR - Everyone submit to Syed Huq at huq@rockie.nsc.com any roster changes or new roster information. VHDL.ORG CHANGES Bob Ross reported that a PERL script utility submitted by John Fitzpatrick is now being used in the /pub/ibis/birds directory (and also in the /pub/rail/roads directory) to create current index.html files. These index.html files allow, by default, a nicely formatted index table of all of the current IBIS BIRDs (and ROADs for RAIL) using a Browser and direct access to any specific BIRD. Bob thanked John for writing this utility. Bob also reported some other changes. The domain name "vhdl.org" will also accept more relevant aliases such as eda.org, verilog.org, etc. since vhdl.org contains directories for many different standards groups, most of which are not associated with the VHDL activities. As a result of lax security precautions associated with a wide spread need for many different groups to access to vhdl.org, a hacker group break-in occurred into vhdl.org. No known damage was found. However vhdl.org was immediately taken off the network as a defensive measure for several weeks. Tighter security measures were taken. Among these were the removal of guest login and direct line modem access. Anonymous FTP and Browser access is still available. These changes are now reflected in the information provided at the end of these Minutes. Finally, Bob has moved some of the information into subdirectories to clean up the file structure under /pub/ibis. One example is to move all of the yearly e-mail directories under one directory "email". Bob also wishes to put the documents now contained under "documents" in a directory named "docs". Currently both directories will exist containing identical information until some links to various documents from the EIA/IBIS home page are changed. IBIS COOKBOOK PROGRESS Chris Rokusek, who is heading this project, asked whether Stephen Peters has done a draft, as previously planned. Stephen reported that he recently has gotten a technical writer who will start working on the Cookbook shortly. MODEL TEST LOAD RECOMMENDATIONS Bob Ross reported that a long standing AR is for vendors to provide Chris Rokusek the information the preferred setups for [Rising Waveform] and [Falling Waveform] data that makes the simulator algorithms most effective. So far Bob and Chris have provide preferred data loads. This information will be put in the Cookbook to help guide all model developers. IBIS-TO-BEHAVIORAL MODEL SUPPORT Syed Huq raised the issue of whether there is a need for the EIA/IBIS Open Forum to pursue IBIS to Spice Behavioral translation. This has been a recent IBIS reflector topic. Syed cited several vendors who have or have had such products and again noted Applied Simulation Technologies recent entry. While some of the products are only at IBIS Version 1.1 level or have been discontinued, there still exists both some coverage and also some opportunity for providing more utilities. SPICE-TO-IBIS TRANSLATOR FOR WINDOWS NT Ian Dodd volunteered to make available the VeriBest adaptation of s2ibis compiled to work under Windows NT from the VeriBest home page. The EIA/IBIS Home page will have a direct link, as it does for the HyperLynx Visual IBIS Editor. Bob Ross endorsed the notion that free utilities available from a number of commercial sites reinforces the reality that there is widespread acceptance of IBIS. This is healthy for the IBIS community as a whole. SPICE-TO-IBIS FROM NORTH CAROLINA STATE UNIVERSITY As reported on the reflector, new version of s2ibis2_v1.1 now exists on vhdl.org under /pub/ibis/s2ibis/s2ibis2_v1.1/s2ibis2.tar.Z for FTP downloading. Alan Glaser made some polarity corrections for Spectre applications. He was not able to provide an AIX executable, as in the past, because he no longer has access to an AIX machine. BIRD40 OVERSHOOT NOMENCLATURE Bob Ross introduced BIRD40 as just a nomenclature change of Overshoot_high to S_overshoot_high and Overshoot_low to S_overshoot_low for static overshoots in the already approved BIRD39. BIRD40 was approved by unanimous vote. VERSION 3.0 FUNCTIONALITY Per discussion at the January 20, 1997 Summit, the issue of Version 3.0 functionality was introduced. Bob Ross summarized the progress since June, 1994 where Version 2.0 of IBIS was introduced through December, 1995 when Version 2.1 was stabilized through several letter ballot votes to become ANSI/EIA-656. During this period, there have been minimal technical changes. Version 2.1 continues to be the most current version. The Open Forum has already introduced (and also rejected) a number of proposals using the BIRD process. These BIRDs have been approved for Version 3.0 along with their associated categories: BIRD28.3 and BIRD37.3: Package Model Enhancements BIRD30.2: Programmable Buffers BIRD34.2: Stored Charge Effects BIRD35.3: Multi-staged Outputs (with possible revisiting) BIRD39 and BIRD40: Specification Enhancements The following BIRDs are still pending: BIRD36.1: Electrical Board Description BIRD41: Modeling Series Switchable Devices (just issued) These BIRDs have been pending, but inactive, and relate to package and connector models. Most likely, a new BIRD will be issued for this area. BIRD31.3: Mated Models BIRD32: Additional Package Model Enhancement All of these features are needed and constitute a rich set for defining the Version 3.0 functionality that will exist beyond Version 2.1 ANSI/EIA-656 functionality. The only addition beyond this might be some form of switchable terminators. that is also to be discussed later. BIRD41 - MODELING SERIES SWITCHABLE DEVICES John Fitzpatrick introduced BIRD41 to the Committee. Bob Ross had formalized the proposal as BIRD41 because there had already been sufficient reflector and face-to-face discussion on this functionality, and John had issued a well-formatted document, even while requesting more feedback. The BIRD process itself can now be the basis for making modifications and moving forward. Bob noted that the IBIS format really does not provide the necessary keywords to describe the series switch devices (Quick Switch, CBT series, etc.) that are now being used in designs. Series elements themselves are not officially defined, although there may be some vendor- specific ways of providing barely adequate work-arounds. BIRD41 defines a new keyword [Series Pin] and two subparameters: Series and Series_Switch. Under [Series Pin], John proposes reusing the existing keywords ([Pulldown] and [Pullup]) and incorporated State information as suggested by Chris Reid of Interconnectix. Bob thought that relying on existing keywords for the purpose of EDA vendor acceptance was a bad idea since the keyword definition would have differences. This would cause both specification confusion and model developer confusion. Bob prefers new keywords with names that reflect more closely what is intended. The keyword [Power Clamp] and [Gnd Clamp] appear to have retained exactly their original meaning and should continue to be used, as defined. Arpad Muranyi questioned whether the series description should contain multiple VI data to model more closely the Source to Drain characteristics as a function of Gate to Drain voltage that exists in FET based series elements. The alternative position is that just a simple series VI relationship adequately describes the characteristics needed for modeling the switch for analysis. After some technical details were suggested, Bob suggested moving this discussion on the IBIS reflector. In response to a question by Stephen Peters about the scope of BIRD41, John answered that it was designed to model the series switch device and also model series diodes. So BIRD41 provides two useful additions. Stephen also asked for clarification of the State terminology in the example. John responded that this column information (e.g., AB-CD) was for clarity and was not used. Bob suggested that John consider the verbal inputs given here and go ahead and issue BIRD41.1. MODELING EARLY CLAMPS IN IBIS Following up on recent meeting discussions, Bob Ross suggested that if Arpad Muranyi really needs the functionality of switchable input terminators soon, he needs to issue a BIRD. However, this may also be a case where this additional functionality could be a Version 3.1 addition since Arpad is currently very busy. PACKAGE COMMITTEE REPORT AND BIRD36.1 - ELECTRICAL DESCRIPTION OF BOARDS Stephen Peters summarized the February 7, 1997 Package Committee meeting position that it will focus on two separate proposals: An Electrical Board description suitable for SIMMs, but without coupling information (just issued as BIRD36.1) Connector Description which includes coupled and non-coupled lines and describes pin pairs. In BIRD36.1, Bob Ross has some minor some minor editorial comments which can be handled off-line. He also questioned whether the "R10K" in the example was really a name of a model, or whether it was an attempt to define a syntax for a resistor element directly. Stephen answered that it was a model name for a shunt resistor. When questioned about including series resistor elements, Stephen responded that it can be modeled using a zero length transmission line segment with R. Regarding connector model directions, the Package Committee appears to have achieved a consensus on using a Matrix description where the Matrix elements are defined as "partial" inductances and capacitances. Jon Powell has solicited sample matrix information from the connector manufacturers so that he can run simulations using that information and comparing the results with corresponding Spice representations using Spice simulations. He is also working on some syntax proposals to reduce the amount of data needed for the descriptions. Stephen is scheduling the next meeting for Friday, February 21, 1997. PARSER STATUS Chris Rokusek has developed an IBISCHK2 extension that generates some warning messages for a suspicious component values and waveform endpoint mismatch conditions that have been previously discussed. These situations are documented as BUG5, BUG6 and BUG7. Chris needs to know how best to provide the executables he has developed. Bob Ross suggested discussing this with Chris off-line. AR - Chris Rokusek and Bob Ross discuss how to make the extended IBISCHK2 executables available. BUG8 - RESERVED KEYWORDS USED AS PINNUMBERS GENERATE ERRORS In the brief time left, Bob Ross indicated that Author Wong of Integrated Device Technology (IDT), had discovered a bug that is now documented as BUG8. Based on a close reading of the IBIS Specification, there can be several interpretations. Regardless of the interpretation, Bob feels that BUG8 would not justify an ibischk2 (and ibis_chk) revision. Easy work-arounds exits. No decision was reached, so the discussion will be continued at the next meeting. NEXT MEETING: The next meeting is on Friday, March 7, 1996, 8:00 A.M. to 9:55 A.M. ============================================================================== 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: http://www.eia.org 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. ==============================================================================