[SI-LIST] Re: Does anyone know how to convert IBIS version 3.2 to version 1.1?
- From: "Mirmak, Michael" <michael.mirmak@xxxxxxxxx>
- To: "Linda Zhang" <lindazhang_si@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 23 Jan 2007 16:15:37 -0800
Linda,
Unfortunately, IBIS 1.1 assumes that the [Ramp] load is 50 ohms (the
R_load parameter was added after 1.1). As a result, you would have to
scale your [Ramp] data to be appropriate to a 50 ohm load. Correlation
of the new model to the IBIS 3.2 data or, better yet, the original
circuit design or lab measurements, would be a must to ensure the model
reflects reality after so many changes.
At this stage, I would concur with Lynne Green and suggest contacting
your tool's technical team about support for more advanced IBIS
versions.
- Michael Mirmak
Intel Corp.
Chair, EIA IBIS Open Forum
http://www.eigroup.org/ibis/
http://www.eda-stds.org/ibis/
________________________________
From: Linda Zhang [mailto:lindazhang_si@xxxxxxxxx]
Sent: Monday, January 22, 2007 10:15
To: Mirmak, Michael; si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Re: Does anyone know how to convert IBIS version
3.2 to version 1.1?
Michael,
Thank you very much for reply. In my version 3.2 IBIS model, the R_load
= 100. You mentioned "If the [Ramp] in the original 3.2 file used a 50
ohm load, you should have a
1.1-compliant IBIS file after the changes". Does it mean I can't convert
it to version 1.1 if the load is not 50ohm?
thanks,
Linda
"Mirmak, Michael" <michael.mirmak@xxxxxxxxx> wrote:
Linda,
Assuming the file is relatively simple and built correctly, you
can do
this conversion manually by deleting the V-t tables (the
keywords
[Rising Waveform] and [Falling Waveform] and the data with
them).
Change the [IBIS Ver] entry to "1.1" and run the IBISCHK4 parser
on the
file. Remove any keywords or subparameters that cause errors. If
the
[Ramp] in the original 3.2 file used a 50 ohm load, you should
have a
1.1-compliant IBIS file after the changes.
Note that you may lose more than a little detail in the response
of the
buffer -- IBIS 1.1 only supported simple ramp rates under the
[Ramp]
keyword. Other useful keywords and buffer types are not
supported under
IBIS 1.1 either. In other words, the conversion may give you a
file
that is compliant to 1.1, but is far less useful!
- Michael Mirmak
Intel Corp.
Chair, EIA IBIS Open Forum
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Linda Zhang
Sent: Friday, January 19, 2007 17:54
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Does anyone know how to convert IBIS version
3.2 to
version 1.1?
The IBIS to PSPICE converter only works for IBIS version 1.1,
but the
vendor gives me the IBIS model of version 3.2. I have to run it
in
PSPICE. Does anyone know how to convert ver 3.2 to ver 1.1?
Thank you in
advacne.
=20
Linda=20
=20
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