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

Absolutely!  However, from the question I
got the impression that Nitin wanted to do
this in the analog world, and AMI is an
algorithmic solution...

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

-----Original Message-----
From: Todd Westerhoff [mailto:twesterh@sisoft.com] 
Sent: Wednesday, July 22, 2009 10:10 AM
To: Muranyi, Arpad
Cc: ibis@eda.org; si-list@freelists.org
Subject: Re: [IBIS] RE: [ibis-macro] IBIS model of drifferential driver with programmable multi-tap preemphasis

Arpad,

.... or they could use IBIS-AMI, as this is what it was designed for.

Todd.

Todd Westerhoff
VP, Software Products
SiSoft
6 Clock Tower Place, Suite 250
Maynard, MA 01754
(978) 461-0449 x24
twesterh@sisoft.com
www.sisoft.com



Muranyi, Arpad wrote:
> 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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