[SI-LIST] Re: [IBIS] RE: [ibis-macro] IBIS model of drifferential driver with programmable multi-tap preemphasis
- From: Todd Westerhoff <twesterh@xxxxxxxxxx>
- To: "Muranyi, Arpad" <Arpad_Muranyi@xxxxxxxxxx>
- Date: Wed, 22 Jul 2009 11:10:17 -0400
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@xxxxxxxxxx
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@xxxxxxxxxxxxx
> [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Nitin Kumar
> CHHABRA
> Sent: Wednesday, July 22, 2009 7:14 AM
> To: ibis@xxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
> Cc: vishrant.goyal@xxxxxx; nitin.chhabra@xxxxxx; nitin.gupta@xxxxxx
> 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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