Minutes, IBIS Quality Committee

24 Jul 2007

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

ROLL CALL
  Adam Tambone
  Barry Katz, SiSoft
  Benny Lazer
  Benjamin P Silva
  Bob Cox, Micron
* Bob Ross, Teraspeed Consulting Group
  Brian Arsenault
  David Banas, Xilinx
* Eckhard Lenski, Siemens
  Eric Brock
  Gregory R Edlund
  Hazem Hegazy
  John Figueroa
  John Angulo, Mentor Graphics
  Katja Koller, Siemens
  Kevin Fisher
* Kim Helliwell, LSI Logic
  Lance Wang, IOMethodology
  Lynne Green
* Mike LaBonte, Cisco
  Mike Mayer, SiSoft
* Moshiul Haque, Micron Technology
  Peter LaFlamme
  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.

AR Review:

- Mike add David's text for 4.2.21, 4.2.23, 4.2.25 to IQ spec
  - Waiting for enough changes to warrant a new release
  - TBD

- Bob modify 5.1.1 to explain [Temperature] better
  - Done
  - We approved the text sent by Bob

AR: Mike insert Bob's 5.1.1 text into IQ spec

- Mike post Roy's doc in work archive
  - Done

New items:

- Roy and Michael Mirmak have been reviewing Roy's IEEE presentation about IBIS.
  - It will be posted to the IBIS web site.

Continued review of IQ specification:

5.1.2.	{LEVEL 2}  [Model] Model_type
- This documents a check performed by ibischk
- The table is confusing
- We decided to delete this check

AR: Mike delete 5.1.2 from IQ spec

5.1.4.	{LEVEL 2}  [Model] C_comp is correct
- This has already been reviewed

5.1.5.	{LEVEL 3S} [Model] C_comp SPICE correlation
5.1.6.	{LEVEL 3M} [Model] C_comp laboratory correlation
- Our new numbering system eliminates the need for these
- We decided to delete these checks

5.1.7.	{LEVEL 3}  [Temperature Range] is reasonable
- Min/max relationship of temperature numbers is already explained in 5.1.1
  - We decided that repetition is OK
- Bob said that default [Temperature Range] information is from IBIS cookbook
  - [Temperature] is informational only, not used by simulators
  - IBIS spec also specifies 50, 100, 0 as default
  - ibischk can not check this, since keyword absence implies the default
  - Roy noted that the default values are for CMOS, but that is not stated
- Bob said customers ask him to create models for specific temperatures
  - Some want extreme ranges
- The IBIS spec has for the [Temperature Range] keyword:
  "Required: Yes, if other than the preferred 0, 50, 100 degree Celsius range"
  - This means ibischk can't check for absence of the keyword.
  - Neither can ibischeck ceck [Temperature Range] for typ/min/max order
- [Temperature Range] values can be checked against the datasheet
  - Insure that IBIS min/max temperatures do not exceed datasheet limits
- Kim pointed out that [Temperature Range] must match actual extraction temperatures
- Mike asked if significantly different temperatures exist on one die
  - He sees buffer models on the same component with different temperatures
  - Sometimes IBIS files are cobbled together from different projects
- Bob said that there may be reasons to model inside datasheet specs
  - Most equipment will not be used in Antarctica, for example
  - Users derate anyway, expecting a temperature range within datasheet limits
- Mike summarized the points that this check might incorporate:
  - The keyword must give actual model extraction temps
  - Check min & max against datasheet, but derating is OK
  - Typical should be the expected operating temperature in typical equipment
  - Buffers on same component should have similar [Temperature Range]
- We agreed that this is a level 2 check

AR: Roy rewrite 5.1.7

5.1.8.	{LEVEL 2}  [Voltage Range] or [* Reference] is complete
- ibischk requires all 4 *reference of voltage range (regardless of tech)
  - [Voltage Range] was the original keyword, and was required
  - The [* Reference] keywords were added later
  - Members didn't want to go through all Model_type tests to determine
    required keywords
  - Roy said that we need to explain this in our check
- Mike suggested that we delete checks 5.1.9 - 5.1.12 and merge into this one
  - There was agreement on this
  - Voltages on the same power bus should be similar

AR: Mike send draft 1.1u IQ spec to Roy
AR: Mike rewrite 5.1.8

Next meeting:

31 Jul 2007
11-12 AM EST (8-9 AM PST)
Phone: 1.877.384.0543 or 1.800.743.7560
Passcode: 90437837

Meeting ended at 12:01 PM Eastern Time.
