Minutes, IBIS Quality Committee

5 January 2015

11:00-12:00 EST (08:00-09:00 PST)

ROLL CALL

eASIC:                              David Banas
Ericsson:                           Anders Ekholm
Intel:                              Michael Mirmak
                                    Eugene Lim
IO Methodology                    * Lance Wang
Signal Integrity Software         * Mike LaBonte
Teraspeed Labs:                   * Bob Ross

Everyone in attendance marked by *

NOTE: "AR" = Action Required.

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

Call for IBIS related patent disclosures:

- None

Call for opens:

- None

ARs:

- Bob update BUG168 to clarify inductance checks
  - Done.

- Mike ask Radek for opinion on BUG168
  - Done.

- Mike add comments to CMPNT, DLY, MSPEC sections.
  - No new progress.

- Lance add comments to EBD section.
  - No new progress.

- Bob add comments to CIRCUIT section.
  - No new progress.

BUG172:
- Bob showed BUG172.
- Bob: The testcase is a 5V CMOS with no V-T tables.
  - The buffers have separate [* Reference] voltage declarations.
  - They all use different voltages.
- Lance: Should [Voltage Range] be 5.0 for the 2nd one?
- Bob: [Voltage Range] is always relative to zero.
  - It was proposed as a range but we needed a reference value for tables.
- Lance: So [Voltage Range] is useless with [* Reference]?
- Bob: Right.
- Mike: The negative supplies are given as POWER in [Pin].
- Bob: But it still fails when I change that.
- Lance: In [Pin Mapping] the NC is in the wrong column for those pins.
- Mike: This might be good to show in the ATM meeting today.
- Lance: A signal should not be both POWER and GND.
- Mike: Some buffers could be connected to a negative supply and GND, and
  others connected to GND and a positive supply.

- Bob: IBISCHK should not be making these checks.
  - These are not in the spec.
- Mike: One check is a warning, and that seems correct.
- Bob: It probably should be demoted to a caution.

- Lance: So POWER and GND do not really mean anything about voltage.
- Mike: They only denote which buffer terminals are connected.

- Mike: Could POWER be more negative than GND?
- Bob: They can be the same voltage but POWER can't be more negative.
  - We should disable these checks.
- Mike: You also suggested demoting the warning to a caution.
  - Caution is useful for things only model makers need to see.

- Mike: We might propose a [Known IBISCHK Messages] keyword.
  - IBISCHK would suppress these.
- Bob: That would be similar to AMI Special_Param_Names, but probably a bad idea.

IBISCHK 6.1.1:

- Bob: We are unable to unzip the latest code due to a password problem.
- Mike: I'll try it myself.
- Bob: We can create a 6.1 Users Guide now.

AR: Mike produce IBIS 6.1 Users Guide

Meeting ended: 12:05 ET

Next meeting Jan 12, 2016