RE: Bus Clamp vs Dynamic Clamp

Arpad,

The question was in regard to the ***STATIC MODE*** of Dynamic Clamp. You
answered a different question.

After ten minutes of reading the spec I conlude that there are two ways to
specify additional static clamping of a given parent model when in a
particular state.

One can use a

        1) "Static Mode" Dynamic Clamp sub-model (means it doesn't have pulse
tables).

        2) "Bus Hold" with NULL I-V Pullup/Pulldown.

Right?

Chris

> -----Original Message-----
> From: Muranyi, Arpad [mailto:arpad.muranyi@intel.com]
> Sent: Friday, March 10, 2000 4:01 PM
> To: 'Chris Rokusek'; Ibis@Eda. Org
> Subject: RE: Bus Clamp vs Dynamic Clamp
>
>
> Chris,
>
> These two were implemented for two completely different circuit
> behaviors. The dynamic clamp shifts the knee voltage of the clamp
> based on some triggering events. The bus hold circuit's I-V cure
> goes through the origin, but it switches from a pullup to a pulldown
> shape when it detects a certain voltage. I don't see how these two
> are the same, or how they could be described with only one of these two
> keywords.
>
> Arpad
> ====================================================================
>
> -----Original Message-----
> From: Chris Rokusek [mailto:crokusek@viewlogic.com]
> Sent: Friday, March 10, 2000 2:10 PM
> To: Ibis@Eda. Org
> Subject: RE: Bus Clamp vs Dynamic Clamp
>
>
> Let me rephrase:
>
> If a Static Mode Dynamic Clamp submodel can be described as a Bus Hold
> model, why do we need a static mode?
>
> Think about this:
>
> There are two submodel types.
>
> Their are multiple modes for each type.
>
> The submodel itself is a type (in so much as its not a model).
>
> The submodel type can only be used under certain conditions of the
> parent
> Model.
>
> That's a lot of IF's just to effectively add a node to a circuit.
>
> Customers keep calling asking me to interpret the IBIS Spec. Therefore, I
> conclude the spec must be difficult to understand.
>
> The more TYPE's, RULE's, IF's, and MODE's there are in this spec, the more
> difficult it becomes to comprehend and maintain. Hey look that makes an
> acronym: TRIM!
>
> Of course its MY FAULT just as much as anyone else's for allowing some of
> these BIRDS to contain redundancies. I'm hoping that we become
> more careful
> as to what we are adding to the spec and perhaps we can even reduce and
> simplify at some point.
>
> Thanks for reading!
>
> Chris Rokusek
> Viewlogic Systems
>
>
>
> > -----Original Message-----
> > From: bob_ross@mentorg.com [mailto:bob_ross@mentorg.com]
> > Sent: Friday, March 10, 2000 12:44 PM
> > To: Chris Rokusek
> > Cc: Ibis@Eda. Org
> > Subject: Re: Bus Clamp vs Dynamic Clamp
> >
> >
> > Chris:
> >
> > Briefly, the Bus Hold submodel always
> > always operates in the triggered mode
> > and optionally with an Off_delay. So
> > it does not have a Static mode.
> >
> > Bob Ross
> > Mentor Graphics
> >
> >
> > Chris Rokusek wrote:
> > >
> > > Hi Ibis-gurus,
> > >
> > > I've got a question:
> > >
> > > I'm wondering what the differences are between:
> > >
> > > 1) "Static Mode" of a Dynamic Clamp Sub-model
> > >
> > > vs.
> > >
> > > 2) Bus Hold Sub-Model.
> > >
> > > If there are no differences, is there any reason we really need the
> > > redundancy and extra confusing verbage defining what Static Mode is?
> > >
> > > Chris
> >
>
>
>
Received on Fri Mar 10 16:55:11 2000