RE: [IBIS-Users] Non-monotonic data - pullup/down, OUTPUT only model ??

Mithlesh,

These kinds of non monotonic shapes are a result of the
subtraction of the clamp data that is obtained from a
3-stated buffer from the PU or PD data that is obtained
from a driving buffer.

If your buffer is not 3-stateable, you would not see such
non monotonic shapes for the PU or PD data.

This is why it is not correct to make an Output buffer
from an I/O buffer just by deleting the clamp tables in
the IBIS file.

Arpad Muranyi
Intel Corporation
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-----Original Message-----
From: owner-ibis-users@server.eda.org [mailto:owner-ibis-users@server.eda.org] On Behalf Of Mithlesh Shrivas-r64034
Sent: Tuesday, May 23, 2006 5:29 AM
To: ibis-users
Subject: [IBIS-Users] Non-monotonic data - pullup/down, OUTPUT only model ??

Hello All,

I was referring to a old discussions on non-monotonicity and collected 
information that says these warnings are common for the
Pullup and Pulldown tables in I/O. If the IBIS file version is used 4.0 
or higher, many these warning could be removed which actually worked for IO.

In my case, the pulldown and pullup data are non-monotonic and if i 
construct an Output type model which does not has Clamp data and
therefore, the non-monotonicity will always exist.

I'm attaching a section of pulldown/pullup data, please review it. I 
think after -0.9, the behavior of data is good but problem exist before 
that.

Do you think that initial few non-monotonic data could create any problem?



Thanks
Mithlesh


-- 
---" "----------------------------" "--.
Mithlesh Shrivas (Core-id:R64034).......
Design Engineer.........................
Freescale Semiconductor India Pvt. Ltd..
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