Subject: RE: [IBIS-Users] IBIS Imponderables
From: Lynne Green (lgreen@cadence.com)
Date: Tue Apr 02 2002 - 12:57:19 PST
Hi, Kim,
1) Ancient history that lingers with us. I personally wouldn't mind
seeing this one reduced to a warning (or even eliminated) in IBIS 4.
2) This one is because some Windows Apps (such as copying a file
to a CD!) thoughtfully change case on files. This rule makes life easier
when files have to go to both UNIX and Windows.
3) Since there is no agreement on where to draw the line between
warnings and errors for mismatches, it is never an error. At least
the size of the mismatch is reported by the parser. (Sigh.)
4) Not sure about s2ibis2, but have seen this where there are not enough
table points in the transition region of a table. Model makers need to
keep more points in tables where data is changing (steep slope), and
fewer where is changing slowly or not at all, for both I-V and V-t tables.
Best regards,
Lynne
Dr. Lynne Green
Cadence Design Systems, Inc.
lgreen@cadence.com
-----Original Message-----
From: Kim Helliwell [mailto:kimgh@apple.com]
Sent: Tuesday, April 02, 2002 10:59 AM
To: 'ibis-users@eda.org'
Subject: [IBIS-Users] IBIS Imponderables
I'm sure I'm not the only person who has wondered
about these:
1. Why is a mismatch in the file name an error, rather than
a warning? In fact, why does it matter at all?
2. Why are only lowercase letters allowed in an IBIS file name?
3. Why are AC mismatches warnings rather than errors?
4. Why does s2ibis2 appear to generate IBIS models
with AC mismatches in the first place? (Judging
from the number of IBIS models I've seen that
used s2ibis2 and had such problems, it is
apparently the norm.)
Feel free to provide answers or add your own imponderables.
Kim Helliwell
Apple Computer
kimgh@apple.com
408 974 9936
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