Minutes, IBIS Quality Committee

11 January 2011

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

ROLL CALL

Cisco Systems:                * Mike LaBonte
Ericsson:                     * Anders Ekholm
Green Streak Programs:          Lynne Green
Huawei Technologies:            Guan Tao
IBM:                            Bruce Archambeault
IOMethodology:                * Lance Wang
Mentor Graphics:                John Angulo
Micron Technology:              Moshiul Haque,
                                Randy Wolff
Nokia Siemens Networks:       * Eckhard Lenski
Signal Consulting Group:        Tim Coyle
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:

- No one declared a patent.

AR Review:

- None

New items:

IBIS summit report:
- Mike showed the previous minutes
- Mike: We reached no conclusion about what to present
  - We might raise the concept of Anders' BIRD
- Bob: If it is a stretch we could skip presenting
- Anders: We could do a short presentation
  - We don't know where we are going yet
- Mike: We could solicit suggested fixtures
- Bob: We could have suggestions but should not prescribe
- Anders: I could write a short presentation

AR: Anders prepare External Test Load/Data presentation for DesignCon

Mike's PWL studies:
- Mike: Resolution may not be high enough
- Eckhard: There is a NUMDIGITS option

Bob: We never got a list of error code numbers for the new IBISCHK
- This group could do that
- Mike: We don't have the code
- Bob: It may reside in limited files
- Mike: It may be a .h file
- Bob: We need a spreadsheet
- Anders: Are there hundreds or thousands?
- Bob: Hundreds
  - The parser prepayment might go toward this
  - There is a new problem with a Ramp message
- Mike: Going forward the developer should maintain the spreadsheet
- Bob: Full descriptions of the checks would be a long term goal
- Mike: Just the printed messages are helpful
  - There would have to be placeholder codes for variable parts
  - This could help us find problems
  - As it stands we find bugs only by accident
- Bob: Notes about the messages really would help
- Mike: I would approve paying Atul to do this
  - This relates to our idea of putting more IQ checks into IBISCHK

Bob: There is a debate about IBIS-ISS support of voltage sources
- There is a concern about opening the door to non-passive elements
- Not all test loads go to zero volts, so at least DC is needed
- Mike: Walter has a good idea in keeping IBIS-ISS passive
  - We can add IBIS keywords for the sources
- Bob: IBIS-ISS cuts out elements that simulators actually have
- Mike: We already have a PWL format: [Test Data]
- Bob: The stimulus should not have modulated width
- Mike: The B element input should be given only as state change times
- Bob: Tools will have to be able to reproduce it
- Anders: We should define only the switch points
  - The analog controls are internal to the simulators
  - We should not use PWL

Next meetings:
- Next meetings Jan 18 and Jan 25

Jan 18 agenda:
- Summit presentation - Ekholm
- PWL source experiment - LaBonte

Meeting ended at 12:13 Eastern Time.