Minutes, IBIS Quality Committee

01 December 2009

11-12 AM EST (8-9 AM PST)

ROLL CALL
  Adam Tambone
* Anders Ekholm, Ericsson
  Barry Katz, SiSoft
  Benny Lazer
  Benjamin P Silva
  Bob Cox, Micron
* Bob Ross, Teraspeed Consulting Group
  Brian Arsenault
  David Banas, Xilinx
* Eckhard Lenski, Nokia Siemens Networks
  Eric Brock
  Guan Tao, Huawei Technologies
  Gregory R Edlund
  Hazem Hegazy
  Huang Chunxing, Huawei Technologies
  John Figueroa
  John Angulo, Mentor Graphics
  Katja Koller, Nokia Siemens Networks
  Kevin Fisher
  Kim Helliwell, LSI Logic
  Lance Wang, IOMethodology
  Lijun, Huawei
  Lynne Green, Green Streak Programs
* Mike LaBonte, Cisco Systems
  Mike Mayer, SiSoft
  Moshiul Haque, Micron Technology
  Muniswarareddy Vorugu, ARM Ltd
  Pavani Jella, TI
  Peter LaFlamme
  Randy Wolff, Micron Technology
  Radovan Vuletic, Qimonda
  Robert Haller, Enterasys
  Roy Leventhal, Leventhal Design & Communications
  Sherif Hammad, Mentor Graphics
  Tim Coyle, Signal Consulting Group
  Todd Westerhoff, SiSoft
  Tom Dagostino, Teraspeed Consulting Group
  Kazuyoshi Shoji, Hitachi
  Sadahiro Nonoyama

Everyone in attendance marked by *

NOTE: "AR" = Action Required.

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

Call for opens and patent disclosures:

- No one declared a patent.

- Bob: The TS parser is just about ready

- Mike: Reminder, there will be no meeting Dec 8

AR Review:

- Mike notify ibis and ibis-quality lists about correlation discussions
  - Decided to wait until the schedule is more certain
  - Expected to discuss the checklist today
  - No meeting next week
  - Correlation discussion may resume Dec 15
  - Bob: Tim Coyle has a webinar coming up, but not related to IBIS

- Moshiul rework IQ checklist for IQ 2.0
  - No report

New items:

Topics we could discuss:
- Feature-selective verification
- Whether to update the Accuracy Handbook
- Should the IBIS librarian make changes for IQ?
- Recommendations for test fixtures for golden waveforms
  - Bob: This is targeted toward a simulation based reference
  - Anders: Agree
- Recommendations for content of IC vendor quality reports
- Real system testing (Huawei is doing this)

Accuracy Handbook discussion
- Mike: Some of it belongs in the Cookbook
- Bob: The Accuracy Handbook is a pretty good document as-is
  - It could be expanded
  - That would be a daunting task

Mike showed the Accuracy Handbook
- Table 2:
  - Mike: 3.4.4 and 3.4.7 have the same title
    - Maybe 3.4.7 uses a terminated fixture for open-drain
    - In general the measurements are in 3 categories:
      - 3.3 for IV measurements
      - 3.4 for VT measurements
      - 3.5 for capacitance measurements
  - Bob: This is good for basic technologies
    - Some technologies might need new tests
    - Differential test were a serious omission
  - Mike: Would like to see these expressed as [Test Load]
  - Anders: We are starting at the bottom, and should start at the top
    - We should define the types of correlation first
- 3.2.3:
  - Mike: This gives only one way to get C_comp
  - Bob: Lance gave a presentation on other ways to do it
    - It is non-linear, C_comp changes with voltage
  - Anders: This is a cookbook discussion
  - Mike: Correlation and cookbook have different target audiences
    - Cookbook is for model makers only
    - Correlation is used by all:
      - Model makers must correlate
      - End users may compare against measurements
      - EDA vendors should automate golden waveform checking
- 4.1:
  - Mike: We should not define correlation levels
    - There should not be pass-fail criteria for correlation
  - Bob: It may be possible to rescale a buffer for another corner
    - The practice of changing IBIS models to match lab sims is controversial
    - The SPICE source may be wrong
      - Blaming IBIS for not matching SPICE may not be fair
  - Anders: How does FSV fit into this?
    - It would add more columns to Table 3
  - Mike: Should an IBIS file have buffers for testing only?
    - Some FSV tests might measure TX to RX timing
  - Anders: There could be a keyword to introduce the extra buffers
    - IBISCHK would have to not complain about them

Meeting ended at 12:00 PM Eastern Time.
