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