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- <title>Combinational analysis</title>
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- <h1>Combinational analysis</h1>
- <center><img src="../../../../en/img-guide/analyze-min.png" width="466" height="323"></center>
- <p>All circuits fall into one of two well-known categories:
- In a <strong>combinational circuit</strong>,
- all circuit outputs are a strict <em>combination</em> of the current
- circuit inputs, whereas in a <strong>sequential circuit</strong>,
- some outputs may depend on past inputs (the <em>sequence</em> of
- inputs over time).</p>
- <p>The category of combinational circuits is the simpler of the
- two. Practitioners use three major techniques for summarizing
- the behavior of such circuits.
- <ul>
- <li>logic circuits
- <li>Boolean expressions, which allow an algebraic representation
- of how the circuit works
- <li>truth tables, which list all possible input combinations and
- the corresponding outputs
- </ul>
- The <em>Combinational Analysis</em> 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.</p>
- <blockquote><a href="open.html">Opening Combinational Analysis</a>
- <br><a href="table.html">Editing the truth table</a>
- <br><a href="expr.html">Creating expressions</a>
- <br><a href="gen.html">Generating a circuit</a>
- </blockquote>
- <p><strong>Next:</strong> <a href="open.html">Opening Combinational Analysis</a>.</p>
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