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

4-state refers to the received values "0,1,Z,X", since 0,1 are the range of known good logic values (for a single bit), the same nomenclature doesn't really apply for real values (since there are a lot of valid discrete values).

I'd prefer to call it "3-Dimensional", the dimensions being:

  Value (logic: 1,0, real: -inf -> +inf)
  Strength (undriven = z, regardless of type)
  Certainty (uncertain logic = x, uncertain real = NaN)

Comments?

Kev.

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