RE: DC convergence

Silvia,

It will re-create the spi files every time if the [Iterate] keyword is not used
in the .s2i file. So if you insert the [Iterate] keyword and have a saved .spi
file, the file will not be over-written. Make sure you delete the previously
generated .out file so your new .spi file will be used to re-sim.

Regards,
Syed

> From: "Montoya, Silvia" <Silvia.Montoya@actel.com>
> To: "'shuq@cisco.com'" <shuq@cisco.com>, ibis-users@eda.org,
lindac@eng.adaptec.com
> Subject: RE: DC convergence
> Date: Wed, 6 Sep 2000 11:49:13 -0700
> MIME-Version: 1.0
>
> Hi Syed,
> I thought running s2ibis2 re-creates the .spi files every time.
> Wouldn't the edits to .DC VOUTS2I 0 ... be lost ?
>
> Thanks,
> Silvia Montoya
> Actel Corp.
>
>
> -----Original Message-----
> From: Syed Huq [mailto:shuq@cisco.com]
> Sent: Tuesday, September 05, 2000 5:40 PM
> To: ibis-users@eda.org; lindac@eng.adaptec.com
> Subject: Re: DC convergence
>
>
> Linda,
>
> This is a well known issue. Here is the workaround:
>
> 1) Make sure the [Iterate] keywork is in your .s2i file. If s2ibis2
> generated
> the Input(.spi)and Output(.out)files successfully, the iterate feature
> helps
> not to re-sim these same model_types again.
>
> 2) Edit the .spi files that caused the convergence problem by reducing the
> range:
>
> Example:
>
> .DC VOUTS2I 0 -1.5 -0.1 #(GND clamp sweep edited to go from 0V to -1.5V)
>
> 3) Re-run s2ibis2
>
> Hope this helps.
> Syed
> Cisco Systems, Inc
>
> > X-Sender: angulo@mail.hyperlynx.com
> > Date: Tue, 05 Sep 2000 16:42:20 -0700
> > To: ibis-users@eda.org
> > From: Linda Chu x3207 <lindac@eng.adaptec.com> (by way of John Angulo
> <angulo@hyperlynx.com>)
> > Subject: DC convergence
> > Mime-Version: 1.0
> >
> > Hi,
> > When DC sweep range from -Vcc to Vcc*2 on the PULLUP/PULLDOWN
> > simulation, it has convergence problem. I try to use the alternative
> > method is to do an AC, but the SPICE-IBIS convertor doesn't recognize
> > the spice output format. So when it generated the IBIS model, it puts
> > out N/A in the current table. Is there anyone can help me on this?
> > thanks
> > linda
> >

 
Received on Wed Sep 6 12:49:03 2000