[IBIS] Submodel clamping curves

Hi All,

I am working on updating support in a simulation tool for certain ibis
keywords.

Two of these are the [Add Submodel] and [Submodel] constructs.

Currently I am trying to determine how I-V curves defined in the submodel
should be combined with those of the parent model to obtain the overal
characteristics. It seems to me that the curves should be added, but I
wanted to gain clarification on this.

For example:
The [Model] defines a [GND Clamp] curve.
The [Add Submodel] mode is set to non-driving.
The [Submodel] defines a [GND Clamp] curve also.

When the model is driving, just the original GND clamp curve will be used,
since the submodel will not come into play due to the non-driving mode.

When the model is recieving, then the GND Clamp curves will be added to
obtain the full GND clamping effect including the submodel.

Is my understanding here correct?

And will this be the same for the other keywords supported by the submodel
i.e. [Pullup], [pulldown], [ramp], [power clamp] etc. ?

Regards,
Danny Wherrett

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