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NoPhys Property: Property Number 5
When the nophys property is applied to an electrical device or
subcircuit, that device or subcircuit is assumed to have no physical
implementation and is ignored in the algorithm that associates
electrical and physical devices and subcircuits. A device or
subcircuit with this property has no dual in the physical layout, and
its terminals will never be placed in the physical layout, where they
would otherwise be visible with the Show Terms command. Devices
and subcircuits with this property will be ignored in LVS testing.
In order to actually simulate a circuit that has been extracted from
the physical layout, it is necessary to add sources and perhaps other
devices, which have no counterparts in the physical layout. In
general, this will cause LVS errors in subsequent LVS runs. The nophys property can be added to the additional devices to avoid these
errors.
The numerical value of the property is 5. The property string is
``nophys''. Xic will always set the property string to this
value. Devices inherit this property from cell definitions in the
device library file. The format is
5 5 nophys;
Next: Special Escapes
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Stephen R. Whiteley
2006-10-23