Re: min and max rising/falling waveforms in s2ibis2

Betty,

Weston is incorrect. There is nothing wrong with s2ibis2
in regards to waveform tables.

In order to generate the 4 necessary waveform tables
you will need these lines in your s2i deck:

[Rising waveform] 50 0.0 0.0 0.0 NA NA NA NA NA
[Rising waveform] 50 3.3 3.0 3.6 NA NA NA NA NA
[Falling waveform] 50 3.3 3.0 3.6 NA NA NA NA NA
[Falling waveform] 50 0.0 0.0 0.0 NA NA NA NA NA

These will generate the proper waveform tables.

I believe that you were looking at the decks which
produce the ramp statements.

regards,

scott

"Beal, Weston" wrote:

> Betty,There's one more reason not to use s2ibis2. Someone needs to come up with a good tool to do this. The few I know of are
> internal to the companies that create them, except for the one commercial IBIS creator tool from Applied Simulation Technology.
> Are there any others?Good luck,Weston
>
> -----Original Message-----
> From: Betty Luk [mailto:Betty@genesis-microchip.com]
> Sent: Friday, November 17, 2000 2:07 PM
> To: 'ibis-users@eda.org'
> Subject: min and max rising/falling waveforms in s2ibis2
>
> Hi,I am using s2ibis2 to generate my IBIS model. I have set the [Voltage Range] to be 3.3 3.0 3.6 (typ, min, max). The
> IBIS cookbook suggests that a 50 ohm resistive load Vdd be used for the rising and falling waveform VT data. In the
> s2ibis2-generated Spice files, the 50 Ohm load always connected to 3.3V, even for the min and max case.Is this the
> correct behaviour? And if so, why are 3.0 and 3.6V (for min and max respectively) not used?I would appreciate any
> feedback.Thanks,Betty Luk
>

--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com