IBIS Macromodel Task Group

Meeting date: 26 Feb 2008

Members (asterisk for those attending):
  Ambrish Varma, Cadence Design Systems
* Arpad Muranyi, Mentor Graphics Corp.
  Barry Katz, SiSoft
* Bob Ross, Teraspeed Consulting Group
* Brad Griffin, Cadence Design Systems
  David Banas, Xilinx
  Donald Telian, consultant
  Doug White, Cisco Systems
  Essaid Bensoudane, ST Microelectronics
  Ganesh Narayanaswamy, ST Micro
  Hemant Shah, Cadence Design Systems
  Ian Dodd
  Joe Abler, IBM
* John Angulo, Mentor Graphics
  John Shields, Mentor Graphics
  Ken Willis, Cadence Design Systems
  Kumar, Cadence Design Systems
  Lance Wang, Cadence Design Systems
  Luis Boluna, Cisco
* Michael Mirmak, Intel Corp.
* Mike LaBonte, Cisco Systems
  Mike Steinberger, SiSoft
* Mustansir Fanaswalla, Xilinx
  Patrick O'Halloran, Tiburon Design Automation
  Paul Fernando, NCSU
  Radek Biernacki, Agilent (EESof)
* Randy Wolff, Micron Technology
  Ray Comeau, Cadence Design Systems
  Richard Mellitz, Intel
  Richard Ward, Texas Instruments
  Sanjeev Gupta, Agilent
  Shangli Wu, Cadence
* Sid Singh
  Stephen Scearce, Cisco Systems
  Steve Pytel, Ansoft
  Syed Huq, Cisco Systems
  Syed Sadeghi, ST Micro
* Terry Jernberg, Cadence Design Systems
* Todd Westerhoff, SiSoft
  Vikas Gupta, Xilinx
  Vuk Borich, Agilent
* Walter Katz, SiSoft

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Call for patent disclosure:

- No one declared a patent.

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Opens:

Arpad: Nearly done with the [External Circuit] clarification BIRD

Arpad: Anders Eckholm from Ericsson has asked good questions about static
overshoot thresholds on the IBIS reflector.

Michael M: The ICM group is finishing Touchstone work
- Will integrate with this group (ATM) after.

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Review of ARs:

- David Banas report Xilinx position on LTI assumption for SerDes
  - TBD

- AMI BIRD authors meet to prove AMI BIRD can handle Mellitz cases
  - Todd: we need real part data
  - We decided to leave this AR on the list.

- Walter coordinate completion of true diff BIRD draft
  - In progress

- Michael M. draft Eye keywords for true diff BIRD
  - In progress

- Randy draft derating keywords for true diff BIRD
  - In progress

- 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:

Randy Wolff presented "Slew Rate Derating in IBIS":
- Slide 4:
  - The "i" stands for "input"
  - These diagrams are from JEDEC
- Slide 6:
  - Walter: "Convex" and "Concave" describe the condition better than
    "non-monotonic"
- Slide 9:
  - JEDEC derating tables are actually regular
    - The columns are each offset by fixed amounts.
    - The full flexibility of the format is not used.
  - Michaal Mirmak: Why can't we just say it's DDR3 and have vendors
    implement the derating according to spec?
    - Randy: Sometimes we want other deratings
- Slide 11:
  - Some slew rate combinations are not supported in the table
  - Randy proposes ignoring this
- Slide 12:
  - IBIS tables here seem to be copied from another slide
- Slide 14:
  - Bob: diff_ac_ac is missing
    - Walter: this is not needed
  - [Receiver Thresholds] sensitivity mechanism doesn't work here
    - No single sensitivity value will reproduce the JEDEC table
    - Might be better to have typ/min/max
- Slide 15:
  - Mike L: do [Derate Setup] and [derate Hold] have to be separate?
    - Bob: setup and hold might have different references
  - Randy: V and T are separate numbers
    - We might consider a single slew rate value
    - May be awkward to give values like 2Gv/s
- Slide 16:
  - May need [Standard Selector] for different scenarios

Next meeting: 4 Mar 2007 12:00pm PT

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