Minutes from the 8 Dec 2015 ibis-quality meeting are attached.
Mike
Minutes, IBIS Quality Committee
08 December 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:
- Mike reply to AOTO about bug report
- Done.
- Bob update bug168.txt
- Done, may be more on this.
- Bob update ibischk6 web page to note new bugs
- Done.
- Mike send notice of IBISCHK6 with bug notes to email reflectors
- Done.
- Mike send W1503 testcase to Bob
- Needs simplification first, has 986 lines.
- Will send to Bob as-is for now.
- 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.
BUG169
- Bob: This is straightforward, it just needs to be classified.
BUG168
- Mike explained the problem.
- Lance: The field solver could fix this just by changing how it prints numbers.
- Bob: Is 10ppm too small for the threshold?
- Mike: Maybe, but it's hard to determine the right tolerance.
- Bob: Vladimir mentioned 1000ppm.
- Files with many pins might print many messages.
- NOTEs will be printed for minor violations.
- We could suppress NOTEs if the violation is under some lower threshold.
- Mike 100ppm might be reasonable.
- I would rather print NOTEs for any negative case, no lower threshold to
suppress that.
- Bob: Also the reporting needs more precision.
- That applies to inductance and resistance too.
- Mike: The explanation in the bug document of the inductance issue is
confusing.
- Bob: We decided to test for positive values only.
- The diagonal dominance check will be disabled.
- Mike: I tried the (L * C) > 0 test that Vladimir suggested.
- Every diagonal entry passed that test.
- Every off diagonal failed, but that is expected.
- Bob: Vladimir was not suggesting we do that test.
- Bob showed the IBIS specification.
- We require inductance matrix diaganol dominance.
- Mike: All we can do now is disable the test and write a BIRD.
- Bob: The key issue is whether the matrix is a transmission line.
- That decides which tests are valid.
AR: Bob update BUG168 to clarify inductance checks
AR: Mike ask Radek for opinion on BUG168
Meeting ended: 12:08 ET
Next meeting Dec 15, 2015
