IBIS Macromodel Task Group

Meeting date: 26 January 2010

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 Herrick, Ansoft
  Chris McGrath, Synopsys
* Danil Kirsanov, Ansoft
  David Banas, Xilinx
  Deepak Ramaswany, Ansoft
  Donald Telian, consultant
  Doug White, Cisco Systems
* Eckhard Lenski, Nokia-Siemens Networks
  Eckhard Miersch, Sigrity
  Essaid Bensoudane, ST Microelectronics
* Fangyi Rao, Agilent
  Ganesh Narayanaswamy, ST Micro
  Gang Kang, Sigrity
  Hemant Shah, Cadence Design Systems
  Ian Dodd, consultant
  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 Komow, 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 Kaufer, Mentor Graphics
  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, Mentor Graphics
  Vikas Gupta, Xilinx
  Vuk Borich, Agilent
* Walter Katz, SiSoft
  Zhen Mu, Mentor Graphics

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Opens:

- None. 

--------------------------
Call for patent disclosure:

- No one declared a patent.

-------------
Review of ARs:

- Walter to email latest BIRD draft to group
  - Done

- Mike to convert Walter's BIRD to PDF and post to web
  - Done

- Arpad: Write a clarification BIRD to discuss accuracy issues related to the 
  various AMI clock_tick algorithms in an IBIS-AMI DLL
  - TBD

- Todd: Update the BIRD for IBIS S-parameter box based on feedback from discussion
  - No update

- 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

-------------
New Discussion:

Arpad showed the ATM Progress Report for the IBIS Summit at DesignCon:
- This has not been sent to the group for review as planned
- There are unresolved questions
- It has a cover page and one slide
- Bob: The cover page should have author and date
- Arpad: Will this be incorporated into another presentation?
- Bob: No, it is separate
- Mike: The long URL might be shortened somehow
- Bob: The interconnect group might tackle EBD/EMD
- Arpad: It should be said that someone will get to that

Walter showed the AMI amendment BIRD draft:
- Fangyi asked by email about passing of TxDCD
- Two lines address this
- All examples of strings now have double quotes
- Arpad: Usually quotes are not used for string literals
- Walter: Description must have a value with double quotes

-Page 15: Rx_Clock_PDF (probability distribution function)
- Can't make the PDF a function of process corner
- The PDF parameter is hard to use
- New parameters suggested:
  - A paragraph has been added for Rx_Clock_Recovery_Mean
- Mike: How about Rx_Clock_Recovery_Mean_Offset
- Arpad: Is it nominal bit time or actual?
- Walter: Bit time is passed to the DLL
- Arpad: The actual bit time at RX can be different
- Walter: The nominal bit time is used
- Fangyi: "0.5*bit time" should be clarified
  - Walter changed to "Center of Eye"
- Rx_GetWave does not return clock ticks for Usage Info or Out
- Walter: The new method is more clear than DjRj
  - There are different distributions for Dj
  - This area should be studied in detail
  - It could be addressed in a second pass
- Fangyi: We do not need to distinguish Dj from Rj
  - Only a distribution function is needed
- Walter: We need to know what all the parameterized distributions are
- Fangyi: There are just a few to cover

- Page 15: Rx_Receiver_Sensitivity
- Arpad: Is the eye diagram supposed to be collapsed toward the centerline?
- Walter: This tells the EDA tool how to process results
  - It is used in clock recovery loops
  - Also for BER analysis
- Fangyi: The EDA tool will apply Gaussian jitter around the eye center
  - What is the appropriate way?
- Walter: We can't restrict how EDA tools process the data
  - Rj has tails, DJ has no tails
- Mike: Some parameters have Rx_ and Tx_ prefixes, but not others
- Walter: Those are used consistently for parameters
  - The confusion may be over references to Tx GetWave and Rx GetWave.
- Arpad: Rx_Receiver seems redundant here

- Page 17: Tap parameter names are numbers
  - Special parameters Limit and Scale are added as checks
  - Array satisfies how IBM handles taps
  - Fangyi asks if leaf order should give the tap numbers
- Arpad: How do we handle hysteresis?
  - There are different conventions about the X state
- Walter: We should expand on this at some point

- Page 18: Example shows relationship between .ami and DLL string

Next meeting: 9 Feb 2009 12:00pm PT

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IBIS Interconnect SPICE Wish List:

1) Simulator directives