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If I create a PCell Cell object I provide it PCell parameters. One can also read PCell parameters of a Cell. However, one can change PCell parameters of only an Instance object. Seems like a weird inconsistency, but perhaps there is something deeper I don't understand.
Comments
Yes, there is a concept.
A PCell "Cell" is a template. A cell declares parameters, but does not give specific values.
A PCell "Instance" is the concrete incarnation with specific parameters.
So you declare parameters on a cell and set parameter values on an instance.
Matthias