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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