[ibis-macro] Minutes from the 25 March 2008 ibis-atm meeting

  • From: <rrwolff@xxxxxxxxxx>
  • To: <ibis-macro@xxxxxxxxxxxxx>
  • Date: Wed, 26 Mar 2008 11:09:26 -0600

Minutes from the March 25, 2008 IBIS-ATM meeting are attached.

Randy
IBIS Macromodel Task Group

Meeting date: 25 Mar 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
* G*** Guan, Sigrity
  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
  Sam Chitwood, Sigrity
  Sanjeev Gupta, Agilent
  Shangli Wu, Cadence
* Sid Singh, Extreme Networks
  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


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

- No one declared a patent.

-----
Opens:

None.

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


- David Banas report Xilinx position on LTI assumption for SerDes
  - No update

- AMI BIRD authors meet to prove AMI BIRD can handle Mellitz cases
  - No update

- 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

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

Continue discussion on Electrical Module Description

Arpad: Asked Walter how he wanted to proceed with updating the EMD proposal.
Walter: There are independent tasks to be done including writing an overall BIRD
        of the structure of EMD and defining content of subcircuits including 
        elements and language.  He is willing to maintain the document and 
        define the overall flow.  He wants volunteers to define the SPICE 
        meta language.
Arpad: Michael Mirmak has done presentations on SPICE meta language.  We should 
       ask him to get involved.
Walter: The next step is to review the presentation more slowly and discuss 
further.

Arpad: IBIS version 5 was discussed recently.  We must have BIRDs ready quickly
       if we want them included.
Walter: He thinks it is too late to get any further BIRDs in 5.0.
Randy: Agreed with Walter.  He thinks we should target IBIS 5.1 for measurement 
       and EMD BIRDs.

Walter brought up his EMD presentation again.

Comments below relate to the Module Interconnect Modeling Requirements slide. 
Bob: Will the format provide enough information to do SSO simulation?
Walter: You need to know information on silicon and package to do proper SSO 
        analysis.  Subcircuits can have enough information for this, including 
        as much or as little as is required for specific customers.
Arpad: Should we include power to power coupling in the list?
Walter: Power distribution (already listed in the presentation) would imply 
        rail voltage AC coupling.
Arpad: What about modeling cutouts or voids in planes?
Walter: Subcircuits could be defined to handle this.
Sid: Would a Power Distribution model include both DC and AC modeling?
Walter: It probably could handle both, just not up to a very high frequency
        without including a frequency dependant model.

Comments below relate to the Corners slide.
Walter: It might be nice to have ranges to describe min/max lengths across a 
bus.
Arpad: There are two types of corner definitions.  One includes variations in
       materials, lengths, etc.  The second is a behavior corner defining what 
       corner actually generates the worst corner for SI.  How do you define 
this?
Walter: A model maker could define the corners.
Randy: It is up to the simulation person to find the worst corners.  I just 
       define the variables.
Walter: Yes, the model creator defines the variables that are most important.

Arpad: Wants to see hierarchy of keywords defined.

Comments below relate to the EMD Solution slide.
Walter: [Components] refers to instances of IBIS components. [mPins] defines the
        pins on the periphery of the module.  [Extended Nets] are connections 
        between [mPins] and [Components] pins that span multiple CAD nets due
        to series and parallel terminations or differential nets. [Supply Nets] 
        are power nets.  [Interconnect Subckts] define ports as [mPins] or pins.
        All of these pins are at the same voltage.
Arpad: Why are [Components] not in subcircuits?
Walter: [Components] are like a bill of materials listing IBIS file instances.
John: The advantage of allowing references from EMD to ICM is that the tool can
      trace port mappings.

Arpad: Will email updated presentation to Mike LaBonte to post on the website.

Arpad: Asked John Angulo if he still wants to discuss his topic related to 
adding
       the ability to reference a [Model] from [Circuit Call].
John: Would like to explore EMD further and can compare the EMD solution to his
      proposal at a later time.

Next meeting: 1 April 2007 12:00pm PT

-----------

Other related posts:

  • » [ibis-macro] Minutes from the 25 March 2008 ibis-atm meeting