Minutes for IBIS Quality Committee meeting.
April 23, 2002 11:00am EST


Adam Tambone Adam.Tambone@fairchildsemi.com
*Barry Katz bkatz@sisoft.com
*Benjamin P Silva benjamin.p.silva@intel.com
Bob Ross bob_ross@mentor.org
*Eckhard Lenski Eckhard.Lenski@icn.siemens.de
Eric Brock ebrock@sisoft.com
*Gregory R Edlund gedlund@us.ibm.com
*Hazem Hegazy hazem_hegazy@mentorg.com
*John Figueroa jfigueroa@apple.com
Kevin Fisher kfisher@sisoft.com
*Kim Helliwell kimgh@apple.com
*Lynne Green lgreen@cadence.com
Mike Labonte mlabonte@hhnetwrk.com
Peter LaFlamme plaflamm@amcc.com
Robert Haller rhaller@cereva.com
*Roy Leventhal Roy_Leventhal@3com.com
Sherif Hammad sherif_hammad@mentorg.com
Todd Westerhoff twester@hhnetwk.com
Tom Dagostino tom_dagostino@mentorg.com

Everyone in attendance marked by  *


Minutes:
-Roll call

-Review of previous Minutes

Discussion on minimum data required for each I/O type.  For each I/O
type we will define minimum required data and optional data.  Eckard
raised the point that Rising/Falling waveforms are sometimes required
and sometimes not.  We are goint to have to clarify this point in the future.

- Siemens Spec will be updated and sent out in a couple of weeks. It
  contained Siemens specific info.  Anyone on the committee who wants
  to review the spec prior to the update is welcome too, just send
  email to Eckard. 

- Roy to send out pointer to doc for quality levels.

- Open Sourcing IBIS golden Parser.  Roy and Barry presented open source
  concept to IBIS committee.  No strong disagreement. Concerns over
  control and cost. IBIS Quality committee asked us to put together a
  proposal.  Kim Helliwell volunteered to investigate models for open
  sourcing the IBIS Golden Parser.

- IV CURVES

  Host of problems encountered.  Visual inspection can find a lot of
  them. 

  Need to look at actual IV curves (ie sum of clamps with Pullup or
  Pulldown) when visually inspecting and parsing for errors. 

  Most common problem is that clamp curves not substracted. Results in
  double counting.

  Another double counting affect: On-die term should be in GND and PWR
  Clamps. Clamp curves should not be overlapping.

  Non-Monotonic Curves also a large issue.  Multipe reasons for
  non-monotonicites: 1) Mathematical issues causing
  non-monotonicity; 2) IV curve generation process wrong. 

  Excessive currents non-acceptable. Common because ESD does not model
  on-resistance.

  IBISCHK needs to look at summation of curves.
  
  One Goal of IBIS-Quality group is to communicate these subtleties to
  users.

  Edge triggered models do not suit themselves well to DC IV curve
  generation. Most cases are encrypted so it is difficult to work
  around this.  Require transient analysis to generate IV. 

  Basic Sanity checks 
      Min/typ/max visual inspection

      Excessive Currents

      End points OK? Curves should go to 0Amps or flat on high-side. 

      Check location of zero-crossing current crossing points


NEXT MEETING

- Tuesday May 14th @ 11:00 EST