Minutes, IBIS Quality Committee

29 Jul 2008

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
  Lynne Green
* Mike LaBonte, Cisco Systems
  Mike Mayer, SiSoft
* Moshiul Haque, Micron Technology
  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 patent disclosure:

- No one declared a patent.

AR Review:

- Anders create example IBIS file with golden waveforms
  - TBD, long term

New items:

Continued review of the IBIS Quality Specification:

5.3.2	{LEVEL 3}  I-V tables have correct typ/min/max order
- Moshiul: DDR3 has compensation, can make the curves nearly overlay.
- We accepted this check with minor typographical edits.

5.3.3	{LEVEL 3}  I-V tables have reasonable numerical range
- This is marked for deletion
- IBISCHK warns above 10 amps
- Bob: Extrapolate at lower slope instead of truncate 
  - Usually limit at a couple of amps
- Bob: Sometimes waivers are appropriate.

We changed checks 5.3.2-10 from LEVEL 3 to LEVEL 2

5.3.8.	{LEVEL 2}  I-V tables do not exhibit stair-stepping
- We discussed causes of stair stepping
  - Mostly number truncation artifacts.
  - Bob: Some devices can have one or more real steps.
- Minor clarifications made to the text.

5.3.9.	{LEVEL 2}  Combined I-V tables are monotonic
- Updated comments regarding IBISCHK and file versions.
  - Parser bug 94 fixed now.
- Added warning that IBISCHK reports only first violation.

5.3.10.	{LEVEL 3}  [Pulldown] I-V tables pass through zero/zero
- Better explanation of zero/zero.
- How to word table votage vs. real voltage.
- Moshiul: Does 0V have to be in the table?
- Mike: IBISCHK uses 1uA as the standard for non-zero current
- Comments about ODT should not apply to a Pullup/Pulldown check
  - Mike: Some models use ODT cancellation in Pulldown instead of Submodel
- Minor clarifications made.

5.3.11.	{LEVEL 2}  [Pullup] I-V tables pass through zero/zero
- New check added
  - Pullup needs this check as much as Pulldown does.
- We copied from 5.3.10

AR: Mike post 1.1ag IQ spec version

Moshiul: IQ does not cover [Series MOSFET]
- We will discuss this next meeting

Next meeting:

05 Aug 2008 11-12 AM EST (8-9 AM PST)

Meeting ended at 12:01 PM Eastern Time.