Re: Clarification question for threshold parameters

Tom,

You are correct.

scott

"Dagostino, Tom" wrote:

> I thought Vmeas is only for outputs. It is the voltage reference for timing
> measurements under the manufacturers recommended load (Cref, Rref, Vref).
>
> Tom Dagostino
> IBIS and Tau Modeling Manager
> SDD
> Mentor Graphics Corp.
> 503-685-1613
> tom_dagostino@mentor.com
>
> -----Original Message-----
> From: Al Davis [mailto:aldavis@ieee.org]
> Sent: Thursday, January 18, 2001 10:46 PM
> To: Ian Dodd; ibis reflector
> Subject: Re: Clarification question for threshold parameters
>
> On Thu, 18 Jan 2001, Ian Dodd wrote:
> > Unless I have missed something, the IBIS spec seems unclear
> > as to what parameters are valid on what types of model.
>
> Correct.
>
> > For example is Vmeas valid for an output type?
>
> 1. Some models use it, and the parser doesn't reject it.
>
> 2. It is useful for mixed-mode (mixed A & D) simulators, when the
> output node is interpreted as a digital node.
>
> > Did I miss something, and if not, have we discussed this problem?
>
> As far as I know, it has not come up before. I ran into it working
> on the IBIS-X standard macro file, and attempting to interface the
> IBIS-X translator to a mixed-mode simulator (ACS).
>
> So, it looks like the answer is YES. I assumed it was NO, and got in
> trouble for it.
>
> al.

--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
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