Minutes, IBIS Quality Committee

25 October 2011

11:00-12:00 EST (08:00-09:00 PST)

ROLL CALL

Cisco Systems:                  Tony Penaloza
Ericsson:                     * Anders Ekholm
Green Streak Programs:          Lynne Green
Huawei Technologies:            Guan Tao
IBM:                            Bruce Archambeault
                              * Greg Edlund
IOMethodology:                  Lance Wang
Mentor Graphics:                John Angulo
Micron Technology:              Moshiul Haque,
                                Randy Wolff
Nokia Siemens Networks:       * Eckhard Lenski
QLogic Corp.:                   James Zhou
Signal Consulting Group:        Tim Coyle
Signal Integrity Software     * Mike LaBonte
Teraspeed Consulting Group:   * Bob Ross
Texas Instruments:              Pavani Jella

Everyone in attendance marked by *

NOTE: "AR" = Action Required.

-----------------------MINUTES ---------------------------
Mike LaBonte conducted the meeting.

Call for opens and IBIS related patent disclosures:

- Mike: Unable to meet Nov 8 due to an election

- Anders: When is the DST change in the US?
  - The change is this weekend in Europe
  - Mike: It is Nov 6 in the US

AR Review:

- Mike start IQ spec section for Algorithmic Models
  - Not done

- Greg remove AMI checklist items not relating to IBIS 5.0 or 5.1
  - Need latest checklist from Mike
  - A lot of the extra items had to do with S-parameters

AR: Mike send latest checklist to Greg

New items:

Mike: What phase is the new format IBIS spec in?
- Bob: Still in edit, but not active

Mike showed the AMI checklist

- Mike deleted 1.3-1.5, about Dependency tables
  - "Fully IBIS compliant analog model" is now 1.3

1.3: Fully IBIS compliant analog model:
- Mike: Where does IBIS stand on specifying analog models?
- Bob: There are competing proposals on that
- Greg: Only I-V and V-T can be used to be 5.0 compliant
- Bob: Some use S-params but those are not compliant
  - In theory the IBIS file is not needed, the AMI can stand alone
- Mike: Opal 4.1 has a list of IBIS keywords for analog sections
  - An Output model probably requires many of the needed keywords
- Bob: Many keywords are optional even if they are really needed
  in some cases
- Mike: Does check 1.3 belong in the syntax checks section?
  - All syntax checks should be implementable in IBISCHK
- Bob: There is no requirement that AMI models are differential, for example
  - Some people assert that that is implied

- Mike: IBISCHK will not flag AMI Range params with Min > Max
- Bob: Corner format does not require that, but Range does
  - The implementation of AMI checking in the parser is minimal

- Mike: IBIS requires minimum keywords for Output that should provide an analog TX model
- Bob: Some IBIS keywords are exempted if there is an [External Model]

Anders: We might have to add something about model performance:
- Eckhard: That depends on the model features
- Mike: The wave_size passed to Getwave might affect performance
  - If many calls of small wave_size are used, startup overhead would be bad
  - If large wave_size is used quadratic memory allocation might be a problem

AR: Mike post latest checklist

Next meetings:
- Next meetings Nov 01 and Nov 15

Oct 25 agenda:
- Continued IBIS-AMI checklist review

Meeting ended at 12:07 Eastern Time.