Subject: Re: ibis question
From: Scott McMorrow (scott@vasthorizons.com)
Date: Tue Oct 16 2001 - 18:18:42 PDT
Sonny,
Oops, I made one mistake.
|
[Voltage range] 1.2 1.1 1.2
should be:
|
[Voltage range] 1.2 1.1 1.3
regards,
scott
Scott McMorrow wrote:
> Sonny,
>
> You have three issues with you s2ibis2 extraction:
>
> 1) the temperature range for typ/min/max are incorrect.
> 2) the voltage range for typ/min/max is incorrect.
>
> These are causing your first warning message.
>
> 3) you did not include min and max fixture voltages in
> your waveform table extractions.
>
> This is causing your waveform table warnings.
>
> Make the following changes to your s2i file:
>
> | typ min max
> |
> [Temperature range] 25 100 0
>
> | typ min max
> |
> [Voltage range] 1.2 1.1 1.2
>
> | Rf Vf Vf_min Vf_max Lf Cf Rd Ld Cd
> |
> [Rising waveform] 50 0.0 0.0 0.0 NA NA NA NA NA
> [Rising waveform] 50 1.2 1.1 1.3 NA NA NA NA NA
> [Falling waveform] 50 1.2 1.1 1.3 NA NA NA NA NA
> [Falling waveform] 50 0.0 0.0 0.0 NA NA NA NA NA
>
> And make sure that your calls to the spice process decks track
> the min and max corners correctly.
>
> The monotonicity issues can be edited out of the file
>
> best regards,
>
> scott
>
> --
> Scott McMorrow
> Principal Engineer
> SiQual, Signal Quality Engineering
> 18735 SW Boones Ferry Road
> Tualatin, OR 97062-3090
> (503) 885-1231
> http://www.siqual.com
>
> Sonny Tang wrote:
>
> > Dear sir:
> > I am making an ibis model for an IO. After I run ibischk3, I
> > got some warnings about VT curves and VI curves are not matching within
> > 2%. Actually, I follow the ibis cookbook to run hspice and make my ibis
> > file. I don't know what cause this kind warning and how to fix it.
> > Also, how does ibis checker calculate data for check VT,VI curve. The
> > following are my ibis file and error message. Thanks
> >
> > Regards,
> >
> > Sonny
> >
> > ------------------------------------------------------------------------------------------------------------------------------------
> > Name: abc.ibs
> > abc.ibs Type: application/x-unknown-content-type-ibs_auto_file
> > Encoding: base64
> >
> > ------------------------------------------------------------------------------------------------------------------------------------
> > IBISCHK3 V3.2.5
> >
> > Checking abc.ibs for IBIS 2.1 Compatibility...
> >
> > WARNING (line 36) - Typ value is not in between min and max
> > WARNING (line 47) - Pulldown Typical data is non-monotonic
> > WARNING (line 48) - Pulldown Minimum data is non-monotonic
> > WARNING - Model 'abc': TYP AC Rising Endpoints ( 0.00V, 0.60V) not within
> > 0.012V (2%) of ( 0.00V, 0.65V) on VI curves for 50 Ohms to 0V
> > WARNING - Model 'abc': TYP AC Rising Endpoints ( 0.59V, 1.20V) not within
> > 0.012V (2%) of ( 0.59V, 1.25V) on VI curves for 50 Ohms to 1.2V
> > WARNING - Model 'abc': TYP AC Falling Endpoints ( 0.59V, 1.20V) not within
> > 0.012V (2%) of ( 0.59V, 1.25V) on VI curves for 50 Ohms to 1.2V
> > WARNING - Model 'abc': TYP AC Falling Endpoints ( 0.00V, 0.60V) not within
> > 0.012V (2%) of ( 0.00V, 0.65V) on VI curves for 50 Ohms to 0V
> > WARNING - Model 'abc': MIN AC Rising Endpoints ( 0.00V, 0.52V) not within
> > 0.010V (2%) of ( 0.00V, 0.57V) on VI curves for 50 Ohms to 0V
> > WARNING - Model 'abc': MIN AC Rising Endpoints ( 0.54V, 1.08V) not within
> > 0.011V (2%) of ( 0.60V, 1.20V) on VI curves for 50 Ohms to 1.2V
> > WARNING - Model 'abc': MIN AC Falling Endpoints ( 0.54V, 1.08V) not within
> > 0.011V (2%) of ( 0.60V, 1.20V) on VI curves for 50 Ohms to 1.2V
> > WARNING - Model 'abc': MIN AC Falling Endpoints ( 0.00V, 0.52V) not within
> > 0.010V (2%) of ( 0.00V, 0.57V) on VI curves for 50 Ohms to 0V
> > WARNING - Model 'abc': MAX AC Rising Endpoints ( 0.00V, 0.66V) not within
> > 0.013V (2%) of ( 0.00V, 0.56V) on VI curves for 50 Ohms to 0V
> > WARNING - Model 'abc': MAX AC Rising Endpoints ( 0.65V, 1.32V) not within
> > 0.013V (2%) of ( 0.59V, 1.16V) on VI curves for 50 Ohms to 1.2V
> > WARNING - Model 'abc': MAX AC Falling Endpoints ( 0.65V, 1.32V) not within
> > 0.013V (2%) of ( 0.59V, 1.16V) on VI curves for 50 Ohms to 1.2V
> > WARNING - Model 'abc': MAX AC Falling Endpoints ( 0.00V, 0.66V) not within
> > 0.013V (2%) of ( 0.00V, 0.56V) on VI curves for 50 Ohms to 0V
> >
> > Errors : 0
> > Warnings: 15
> >
> > File Passed
-- Scott McMorrow Principal Engineer SiQual, Signal Quality Engineering 18735 SW Boones Ferry Road Tualatin, OR 97062-3090 (503) 885-1231 http://www.siqual.com
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