Minutes, IBIS Quality Committee

17 November 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
  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.

- Mike has an ongoing meeting conflict
  - Would like to avoid running over 1 hour to rejoin other meeting

AR Review:

- Mike upload new IQ spec and fix web page to link it

- Moshiul rework IQ checklist for IQ 2.0

- Lance try to find IBIS files with [Diff Pin] Tdelay out of order
  - Talked to TI
  - Unable to release any files
  - Mike: This is enough to prove that typ/min/max swizzling is real

New items:

Mike showed the IQ web page:
- It now has links directly to ver1 and ver2 docs
- Bob: Would anyone be able to operate the web tools that create this?
- Mike: It isn't that easy, takes a series of steps to add something
  - quality and macromodel use the same Perl software
  - There is a README in the macromodel directory

We looked at the IBIS Accuracy Handbook:
- Mike: Test loads should be discussed in the context of Golden Waveforms
- Bob: This is written with legacy CMOS in mind
  - It never addressed differential or ECL
  - Implies bipolar in some places
- Mike: Section 3 is about how to make IBIS models
  - This should be in in the cookbook
  - Section 4 is about correlation
- Table 3: Correlation Levels
  - Mike: Known typ/min/max samples can be provided by SPICE
  - Bob: Not a fan of just numbers
    - Like to see the waveforms too
  - Mike: Not inclined to have correlation level "buckets"
  - Anders: It doesn't really add anything
- Bob: Huawei likes to correlate against real boards
- Anders: They also adjusted the buffers on the board
  - Not sure how they would know what corner they are in
- Eckhard: They may be comparing against the IBIS models
- Lance: They modify the IBIS models to match their measurements
  - You would have to be sure your measurements are right
- 4.3 Curve Overlay Metric
  - The FOM algorithm is a simple unweighted error summation
- Bob: Randy Wolffe has a presentation last year
  - Used I-V strength scaling to improve correlation
  - Then update V-T curves
- Bob: Tom Dagostino may have a presentation on sampling issues
  - Measurement does not show wild swings
- Anders: You need multiple loads to get it right
  - JEITA does 12 loads
- Mike: So far this has 3 parts:
  1) How to extract IBIS
    - Should drop this, it belongs in the Cookbook
  2) Test loads
    - We should give direction on this
    - Maybe people will start to generate Golden Waveforms, given direction
  3) Correlation measures
    - David and Roy got us going down the feature-selective measurement path
- Bob: We should just leave the Accuracy Handbook behind
- Bob: The FOM is a voltage domain measure, not time domain

AR: Mike notify ibis and ibis-quality lists about correlation discussions

Lance: There is a new "IBIS Healing" tool
- There were problems running it
- Bob: You have to expand the page and hit Next
  - Guy DeBurgh found this tool
  - It came from a professor in Italy affiliated with UMR
- Mike: We might want to look at it

Meeting ended at 12:11 PM Eastern Time.
