[IBIS] RE: [SI-LIST] Re: [ibis-macro] IBIS model of drifferential driver with programmable multi-tap preemphasis

Nitin,
Additional to Arpad's comments:
There is a possibility to use Driver Schedule for multi-tap pre-emphasis
buffer modeling. I did a presentation in 2005 and showed it works for 4 tap
in the presentation below: (page 41)
http://www.vhdl.org/pub/ibis/summits/mar05j/wang.pdf

Also, you could do Spice-macromodeling with IBIS buffer models for
pre-emphasis. The benefits for it are faster and can be used in the most of
Spice simulators. Users will not be requested to cost more for new tools.

http://iometh.com/Product/SIMDE/Macromodeling.pdf
http://www.vhdl.org/pub/ibis/summits/oct06b/wang.pdf

Hope this helps,

Lance Wang
IO Methodology Inc.

SIMDET V1.0 - Signal Integrity Model Development Environment
The complete IBIS / Spice Macromodel generation and validation tool
www.iometh.com/Product/SIMDE



-----Original Message-----
From: si-list-bounce@freelists.org [mailto:si-list-bounce@freelists.org] On
Behalf Of Muranyi, Arpad
Sent: Wednesday, July 22, 2009 10:54 AM
To: ibis@server.eda.org; si-list@freelists.org
Subject: [SI-LIST] Re: [ibis-macro] IBIS model of drifferential driver with
programmable multi-tap preemphasis

Nitin,

If you have access to the stimulus, you could pull this off
with the Driver Schedule or even without it, but that would
be a semi official IBIS solution because it may not work in
all tools.  For example, if you do it with the HSPICE B-element,
you could make a B-element for each stage of your buffer,
and then make a special stimulus generator which reproduces 
the bit pattern dependent waveforms for the input to each
B-element (buffer stage).  This way the stages of your buffer
would still be IBIS models, but the relationship between them
would be outside the IBIS world.

Another way to do it would be to use the *-AMS extensions of
IBIS.  This way you could make a completely official model
for the entire buffer.  However, not all IBIS tools have
implemented the *-AMS extensions of IBIS, although there are
several tools with Verilog-A support which may be sufficient
for what you want to do.

I hope this helps.

Arpad
===============================================================

-----Original Message-----
From: ibis-macro-bounce@freelists.org
[mailto:ibis-macro-bounce@freelists.org] On Behalf Of Nitin Kumar
CHHABRA
Sent: Wednesday, July 22, 2009 7:14 AM
To: ibis@server.eda.org; si-list@freelists.org
Cc: vishrant.goyal@st.com; nitin.chhabra@st.com; nitin.gupta@st.com
Subject: [ibis-macro] IBIS model of drifferential driver with
programmable multi-tap preemphasis

Hi experts,

We want to develop  the IBIS model for a differential driver with pre 
emphasis .
The driver has three tap with programmable pre emphasis options.

Does anyone came across such IBIS or could provide some IDEA how to 
proceed for the same.
Using Driver Scheduling, we are able to make model for first tap pre 
emphasis  buffer.
But we cannot accommodate the second  and third tap  options as they 
require previous bit histories.

with regards,
Nitin
 



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