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<div class='klayout-generated-doc'><p class="navigator"><b>KLayout Documentation (Qt 5): </b><a href="../index.html">Main Index</a> » <a href="index.html">Various Topics</a> » Connectivity</p><h1>Connectivity</h1><p>
Use the connectivity page to specify the conductor layers and their connections.
On a conductor layer, all touching or overlapping shapes are connected.
A connection is made between conductor layer when the shapes of the two conductor layers overlap.
Optionally a via layer can be specified which must be present to make a connection between the two conductor layer.
</p><p>
To specify a conductor layer
</p><ul><li>
Use "layer/datatype" notation to specify explicit GDS layers and datatypes.
</li><li>
Enter the layer name to specify either a named layer or a symbolic layer.
Symbolic layers must be defined in the symbol table (see <a href="symbolic_layers.html">Symbolic Connectivity Layers</a>)
and can be computed from boolean expressions.
</li><li>
Instead of using a symbolic layer,
enter a expression directly without defining a symbol (see <a href="symbolic_layers.html">Symbolic Connectivity Layers</a>).
Inside the expressions
<ul><li>
Use "layer/datatype" notation to specify an original layer with explicit GDS layers and datatypes.
</li><li>
Use the name to specify a named original layer or to refer to a different symbolic layer defined in a symbol entry.
</li><li>
Use the operators '+', '*', '-' and '^' to specify logical OR, AND, NOT and XOR respectively.
The precedence of evaluation is '^' and '*' before '+' and '-'.
</li><li>
Use round brackets to group expressions.
</li></ul></li></ul><p>
By creating conductor layers with boolean expressions, it is possible for example to separate an active area
layer of a CMOS transistor into source and drain regions by subtracting the gate poly. Symbolic layers are useful
to use "speaking" names for layers instead of the numeric layer/datatype specification.
Please note, that the net tracer is considerably slower when using boolean expressions.
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