Re: [IBIS-Users] possible ibis golden parser bug

Actually the problem is the other way around. The parser errors indicate
that
during the v/t testing with the load the part works fine. The errors are
when
the parser compares the DC i/v curves with the end points of the v/t curves.
The
results of the v/t curve look reasonable. But the same load applied to the
i/v curve
yields unreasonable results. Indicating the the i/v data is messed up OR the
parser
is having trouble with the load line computation. Increasing the simulation
time is
clearly not the answer here. I suggest scrutinizing the circuit files that
extract the
DC i/v curves first. Then check the i/v curves to see if the results seem
reasonable.
Based on the parser I don't think so. Otherwise he may have special
technology
such that the i/v curve does not cross 0 or something of that nature and
that can
cause the parser to have problems computing the correct result from the load
line.

Best Regards,
Fred
----- Original Message -----
From: "Mohan, Prabhu" <Prabhu.Mohan@actel.com>
To: "RODRIGUEZ_LECONA_RAMIRO" <rlecona@siu.buap.mx>; <ibis-info@eda.org>;
<ibis-users@eda.org>
Sent: Thursday, October 28, 2004 12:01 PM
Subject: RE: [IBIS-Users] possible ibis golden parser bug

> Hi Ramiro
>
> Most of the errors are reporting huge percentage differences. Looks like
the
> buffer is too weak for the 50ohm pullup/down. So increasing simulation
time
> by a factor of 2 or 3 may not help. You can try a couple of things.
> 1) Try increasing the simulation time by 10x or even larger, just to see
how
> far the buffer can drive.
> 2) A 50ohm load may not be appropriate for this driver. You might want to
> use a larger resistor, say 500ohm.
>
> Thanks
> Prabhu
> -----Original Message-----
> From: RODRIGUEZ_LECONA_RAMIRO [mailto:rlecona@siu.buap.mx]
> Sent: Wednesday, October 27, 2004 3:38 PM
> To: ibis-info@eda.org; ibis-users@eda.org
> Subject: [IBIS-Users] possible ibis golden parser bug
>
> Hi Prabhu and everbody:
>
> Thanks for your answer. I increased the simulation time by 2 and 3 factor
> but IBISCHK3 gives exactly the same errors and warnings. Something wrong
is
>
> happening.
>
> Best Regards,
>
> Ramiro R. Lecona
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Received on Thu Oct 28 12:16:21 2004