Subject: RE: [IBIS-Users] Problem in ibs file generated by s2ibs2
From: Mike LaBonte (milabont@cisco.com)
Date: Wed May 14 2003 - 11:52:58 PDT
The fixed s2ibis2 prints 4 digits after the decimal instead of 2. With only
2 digits, voltage differences less than 10mV between points make them appear
identical.
Also there is a parameter in s2idflt.h:
#define DIODE_DROP_DEFAULT 1.0
This is used by s2ibis2 to jump around in the SPICE data to find beginnings
and ends of "linear" and "non-linear" regions. On lower voltage devices the
1V value makes s2ibis2 jump too far and pick up wrong data or ignore data.
Change the value to 0.7, recompile, and s2ibis2 will work better.
Mike LaBonte
> -----Original Message-----
> From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
> Behalf Of Syed Huq
> Sent: Wednesday, May 14, 2003 12:12 PM
> To: Birendra Rana
> Cc: ibis-users@eda.org
> Subject: Re: [IBIS-Users] Problem in ibs file generated by s2ibs2
>
>
> First of all, you are using an older version of s2ibis2. You should
> download the s2ibis2_fix.tar.Z
>
> I have seen these repetition of data points. Not sure what causes it.
> You have to delete them to clean up the file.
>
> Delete everything below 3.6V as well as one of the -0.9 entries.
>
> Syed
>
> On Wed, 2003-05-14 at 04:56, Birendra Rana wrote:
> > Hi all,
> >
> > I have generated an IBIS Model for an I/O buffer using s2ibis2 script.
> > Interestingly the generated ibs file has entries in the Pull down
> > table as follows :
> >
> > [Pulldown]
> > | voltage I(typ) I(min) I(max)
> > |
> > -1.80 -42.50mA -54.11mA -28.61mA
> > .
> > .
> > .
> > -0.90 -36.68mA -30.62mA -38.74mA
> > -0.90 -36.68mA -30.62mA -38.74mA <-
> > Repetition of above data
> > -0.80 -37.07mA -29.68mA -41.00mA
> > .
> > .
> > .
> > 0.00 0.36uA 2.61nA 2.86uA
> > .
> > .
> > .
> > 3.60 94.05mA 80.81mA 0.11A
> > 0.00 -1.80A 0.11kA -92.95A <-
> > ?????
> > -137.28 -1.70A -99.02A -82.08A <-
> > ?????
> > 3.60 94.05mA 80.81mA 0.11A <-
> > Repetition of 3.60V entry data
> >
> > Similar kind of entries (like the repetition of -0.90V and 3.60V data
> > and extra 2 rows) are there in the Pullup table. The ".out"
> > files however look alright.
> >
> > Any reasons for these extra / repetitive entries ?
> >
> > Regards,
> >
> > Birendra
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