Re: [SI-LIST] : IBIS models at Gbit speeds

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From: Laurence Michaels (lmichael@techmail.gdc.com)
Date: Mon Dec 13 1999 - 06:13:21 PST


> John Lin (林朝煌) wrote:
>
> Hi,
> Indeed, XTK model contains a few number of points compared to IBIS
> after doing IBIS2XTK. However, plotting both, you will find that they
> are quite match with each other.
>
> XTK will automatically increase points at the truning corner of
> waveform. The accuracy of simulation is not suffered.
>
> John Lin
> SI engineer at Quanta Computer Inc.
>
>
>
> -----Original Message-----
> From: Jim Freeman [mailto:freeman@broadcom.com]
> Sent: Saturday, December 11, 1999 2:02 AM
> To: si-list@silab.eng.sun.com
> Subject: Re: [SI-LIST] : IBIS models at Gbit speeds
>
> Hi,
> To my knowledge, Quad and Viewlogic Xtk don't directly use IBIS
> models. Instead, there is a compiler the linearizes the IBIS models
> and drastically
>
> reduces the number of points that are used in simulation.
>
> Jim Freeman

I believe this reduction of points can be influenced by using
IBIS2XTK switches
-vt <val> voltage tolerance in Volts
-it <val> current tolerance in Amps
-ae <val> absolute error (0.0 < val < 1.0)

Exactly how these switches affect the output, and what the default
values are, does not seem to be documented anywhere. Anyone from
Viewlogic/Quad care to comment?

Regards,

-- 
Laurence Michaels
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