Minutes, IBIS Quality Committee

03 May 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.

- Mike: Anders will not have an IQ presentation at the upcoming summit
- Bob: There will be a presentation on test loads for QA
  - Anders' presentation will be a back up in case of a no show

AR Review:

- Study [External Circuit] for possible reuse in test section
  - Done

New items:

Mike: Did the External Circuit ISS BIRD pass?
- Bob: Not yet

Mike showed the [IBIS 5 spec [External Circuit] section
- Bob: This is a top level keyword
  - The call keyword is [Circuit Call]
  - The node names are positional
- Mike: [Pin Mapping] technically could be used in parallel with [External Circuit]
- Bob: That is for power connections
  - IBIS specification page 101 has a table of reserved port names
  - It can hook up power nodes, for example
- Mike: It is a complication that this table applies to both [External Model] and [External Circuit]
- Bob: We should treat [External Circuit] as not using any of these names
  - They were designed with [External Model] in mind
- Mike: We should decide if we can use [External Model]

Anders: Do we really want to support all of these languages?
- Mike: How much simulator support is there for the AMS languages?
- Bob: Vendors tend to each support mostly one AMS language
- Anders: In test data we should support only ISS
  - We could still use the [External Circuit] keywords, but limited to ISS
- Lance: We should have another keyword, not [External Circuit]
- Bob: Agree
  - This is for on-die structures
- Mike: The development of [External Circuit] would be constrained if it had two uses
  - Someone has proposed adding the B element to [External Circuit]
- Anders: We seem to agree not to use [External Circuit]
- Mike: We could use some of it's language
- Bob: That might complicate things
  - Digital ports require things like A-to-D and D-to-A converters
- Anders: We don't need that here
- Mike: [External Test] should work even where [External Model] and [External Circuit] are used
- Bob: Some have people have misused [External Circuit] as a package model
  - It is supposed to be used in conjunction with a separate package model

Mike: We could use the diagram on page 136 as a reference
  - Should we allow use of D_enable and D_receive?
  - IBIS does not have tables for enable on/off transitions
- Bob: Some buffers are designed to switch using enable
- Anders: We have no digital controls
- Mike: Our stimulus patterns are digital controls
- Anders: You can't hook the output of one buffer to the input of another
- Bob: The EDA tools provide that
- Mike: It would be best to not bypass the simulators' normal operation

Anders: Are there any models using [External Model] or [External Circuit]?
- Lance: Cadence wraps models in DML language
- Bob: Syed at Cisco may be using VHDL-AMS
  - It will usually be somewhat vendor specific

Mike showed External_Test.doc:
- Mike: This has become messy, but we should continue working on it
  - It uses two different ways to express typ/min/max corners
- Anders: Since this will be external to IBIS the ISS content could be here
- Mike: It would be good to allow content either here or external

AR: Mike update External_Test.doc

Next meetings:
- The European summit is May 10, we will skip that week
- Next meetings May 17 and May 24

May 17 agenda:
- Review external test BIRD draft

Meeting ended at 12:17 Eastern Time.
