8.2.1. Logic symbols and operations
In addition to 1 and 0, logic simulators often include two more symbols: u (unknown) and Z (high-impedance); the former represents the uncertain circuit behavior, and the latter helps resolve the behavior of tristate logic. For cases in which 0, 1, u, and Z are insufficient to meet the required simulation accuracy, intermediate logic states that incorporate both value and strength may be used.
8.2.1.1. “1” and “0”
The basic mathematics for most digital systems is the two-valued Boolean algebra. In two-valued Boolean algebra, a variable can assume only one of the two values, true or false, which are represented by the two symbols 1 and 0, respectively. Note that 1 and 0 here do not represent numerical quantities. ...
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