All circuits fall into one of two well-known categories:
In a combinational circuit,
all circuit outputs are a strict combination of the current
circuit inputs, whereas in a sequential circuit,
some outputs may depend on past inputs (the sequence of
inputs over time).
The category of combinational circuits is the simpler of the
two. Practitioners use three major techniques for summarizing
the behavior of such circuits.
The Combinational Analysis module of Logisim allows
you to convert between these three representations in all
directions. It is a particularly handy way of creating and
understanding circuits with a handful of one-bit inputs and outputs.
- logic circuits
- Boolean expressions, which allow an algebraic representation
of how the circuit works
- truth tables, which list all possible input combinations and
the corresponding outputs
Opening Combinational Analysis
Editing the truth table
Generating a circuit
Next: Opening Combinational Analysis.