RE: [sv-dc] 4-state vs 3-D

I am also not sure how to deal with X for real values,
because continuous real numbers have no X-gap.
And I do not see why a "real" X state is necessary for real-to-logic
conversion or multi-driver resolution of 2-D or 3-D reals.
Can anybody provide a practical RVM-example where a X-state for real
values is indispensable ?

-- Achim

On Fri, 2010-12-10 at 17:17 +0000, Lear, Jim wrote:
> Sure, but the subject states "4-state vs 3-D." Are there two proposals or concepts we're trying to weigh, such as enumerated vs structure?
>
> From the electrical domain 'Z' is reasonably straightforward. The 'X' is a new concept for that side, but the NaN is quite similar. The subtleties are escaping me.
>
> Kindest Regards,
> Jim Lear
> Cirrus Logic
> (512) 851-4612
> (512) 293-7248 (mobile)
>
> -----Original Message-----
> From: Scott Cranston [mailto:cranston@cadence.com]
> Sent: Friday, December 10, 2010 10:28 AM
> To: Lear, Jim; 'sv-dc@eda.org'
> Subject: RE: [sv-dc] 4-state vs 3-D
>
> I think we're trying to decide what is being modeled in real modeling and (a subdecision) what X means in that model.
>
> -- Scott
>
>
> -----Original Message-----
> From: owner-sv-dc@eda.org [mailto:owner-sv-dc@eda.org] On Behalf Of Lear, Jim
> Sent: Friday, December 10, 2010 9:25 AM
> To: 'sv-dc@eda.org'
> Subject: RE: [sv-dc] 4-state vs 3-D
>
> I'm not sure how important this is, but in the AMS world with boundary models (connect rules), an 'X' can also represent a Voltage that is between the zero- and one-threshold; the meta-stability region. This arises in the conversion from a known Voltage to a logic value.
>
> I'm not sure exactly what we're trying to solve. Are we trying to decide between a "four state" and a "3-D" implementation? It's not clear what exactly is meant between the two. Would someone be kind enough to clarify?
>
> Kindest Regards,
> Jim Lear
> Cirrus Logic
> (512) 851-4612
> (512) 293-7248 (mobile)
>
>
>
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