IBIS Macromodel Task Group

Meeting date: 14 April 2009

Members (asterisk for those attending):
  Adge Hawes, IBM
  Ambrish Varma, Cadence Design Systems
* Anders Ekholm, Ericsson
* Arpad Muranyi, Mentor Graphics Corp.
  Barry Katz, SiSoft
* Bob Ross, Teraspeed Consulting Group
* Brad Brim, Sigrity
  Brad Griffin, Cadence Design Systems
  Chris McGrath, Synopsys
  David Banas, Xilinx
  Deepak Ramaswany, Ansoft
  Donald Telian, consultant
  Doug White, Cisco Systems
  Eckhard Lenski, Nokia-Siemens Networks
  Essaid Bensoudane, ST Microelectronics
* Fangyi Rao, Agilent
  Ganesh Narayanaswamy, ST Micro
  Gang Kang, Sigrity
  Hemant Shah, Cadence Design Systems
  Ian Dodd, Agilent
  Jerry Chuang, Xilinx
  Joe Abler, IBM
* John Angulo, Mentor Graphics
  John Shields, Mentor Graphics
  Ken Willis, Cadence Design Systems
  Kumar Keshavan, Sigrity
  Lance Wang, Cadence Design Systems
  Luis Boluna, Cisco Systems
* Michael Mirmak, Intel Corp.
  Mike LaBonte, Cisco Systems
  Mike Steinberger, SiSoft
* Mustansir Fanaswalla, Xilinx
  Patrick O'Halloran, Tiburon Design Automation
  Paul Fernando, NCSU
  Pavani Jella, TI
* Radek Biernacki, Agilent (EESof)
* Randy Wolff, Micron Technology
  Ray Comeau, Cadence Design Systems
  Richard Mellitz, Intel
  Richard Ward, Texas Instruments
  Samuel Mertens, Ansoft
  Sam Chitwood, Sigrity
  Sanjeev Gupta, Agilent
  Shangli Wu, Cadence Design Systems
  Sid Singh, Extreme Networks
  Stephen Scearce, Cisco Systems
* Steve Pytel, Ansoft
  Syed Huq, Cisco Systems
  Syed Sadeghi, ST Micro
  Ted Mido, Synopsys
  Terry Jernberg, Cadence Design Systems
  Todd Westerhoff, SiSoft
  Vladimir Dmitriev-Zdorov
  Vikas Gupta, Xilinx
  Vuk Borich, Agilent
* Walter Katz, SiSoft
  Zhen Mu, Cadence Design Systems

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Opens:

Arpad may not be able to call in for the meeting next week.
- Michael M may be able chair, not sure

Arpad asked for feedback on the meeting last week:
- There may be long term but not short term connections between IBIS and CMC
- Randy: We should not stall our current work
- Walter: We will be done before them and can present our work to them
  - They can come up with equivalent elements
  - It must be possible to translate back and forth
- Arpad: They seem to be going down the IC path currently
- Brad: They seem to be looking at the language, not the content

Michael M suggested setting a timeline for our open items
- Walter:
  - IbisIS - This may be done by end of summer or early fall
    - Some time in June we should have a reasonable document
    - We need to get a few more DOC files from Synopsys
    - Task: Go through edited DOC file (4 wks from 4/21)
    - Task: Add boiler plate (why, etc...)
    - Task: Editorial review (couple of months ???)
    - Target IBIS Summit at DAC for introducing the draft (end of July)
  - EMD would be next
  - Touchstone:
    - Touchstone ports info (1-3 months)
    - Touchstone sparse matrix format (1 month)
    - These can be independent of us
    - The ad-hoc interconnect group can do it
    - Radek: These may be underestimating
  - AMI improvements
    - Working to solve non-LTI issues (3 months)
AMI improvements (BIRD 107 caused AMI to be LTI only, 3 months)
- Arpad: We need a detailed timeline for the document we are working on
  - Walter: It depends on feedback received
  - Michael M: What are the tasks?
  - Walter:
    - Need to get 1 or 2 .doc files from Synopsys
    - Repeat edit process on those
    - Need to accept/reject the changes
    - Add boilerplate
  - Mike L: We should allow time for editorial review
    - Randy: That could stretch out over a long time.

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Call for patent disclosure:

- No one declared a patent.

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Review of ARs:

- Todd: Write IBIS s-param BIRD
  - Still working on it
  - It may be done in 2 weeks or so

- Arpad:  Write parameter passing syntax proposal (BIRD draft)
          for *-AMS models in IBIS that is consistent with the
          parameter passing syntax of the AMI models
          - TBD

- TBD:    Propose a parameter passing syntax for the SPICE
          - [External ...] also?
          - TBD

- Arpad:  Review the documentation (annotation) in the macro libraries.
          - Deferred until a demand arises or we have nothing else to do

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New Discussion:

Arpad: Can we have something ready for the DAC summit in July?
- Randy: We should be able to do that
- Walter: The boilerplate may not be ready
  - That may be important to have though
  - The reference manual part is simple

Walter showed the IbisIS document:
- Walter has worked on 4 documents from Synopsys so far
  - Could not find the T element in the documents we have
  - Most of the content has been deleted
  - Would prefer not to go through the deleted content during meetings
- Arpad: The W element seems to be in 2 places
  - Walter: Yes, we have to figure out the differences
- Not much was deleted from the S element
- Arpad: It looks like W element still has the RLGCFILE param
  - We agreed to drop this
  - Walter: Will have to check on this
- The only independent source retained was the shunt element
- Arpad: CCVS vn1 has plural "sources"
  - Arpad: We should allow only one controlling source
  - Walter: Need to understand why these are needed
- Mike L: What will we do about unresolved references?
  - Arpad: Some of these point to the same file
  - It may be only necessary to regenerate the references

Arpad: How will the work be assigned?
- If we ask people to send comments to Walter it may not be thoroughly reviewed
- Walter: We do not have the general rules or SUBCKT.
  - We have:
    - Simple Linear elements
    - Dependent Sources
    - W element
    - S element
  - Mike L can look at Dependent Sources
  - Randy: Has read the documents and has comments

Randy showed his IbisIS review comments:
- Examples should be included
  - Walter: They take up a lot of space and were deleted
  - Often they used features we do not support
- Can capacitors have expression parameters?
- Walter: We can drop the F element
  - Mike L: Aren't these used for coupling in some connector models?
  - We will keep them
- Should we support Y matrix data?
  - We should support whatever Touchstone supports
- Improve formatting text 'str' under Touchstone
  - Some confusion over this
- Should we support Lgnd, Rognd, Rsgnd?

AR: Walter send IbisIS documents to list (with Randy's email)
AR: Mike L update Dependent Sources document

Not sure about logistics for the next meeting.

Next meeting: 28 April 2009 12:00pm PT

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