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Display child parameters on the Parent symbol instance

Saumeek

Sir,

Using GF 12nm PDK, I have created an inverter schematic with pPar and iPar properties. 

Whenever this inverter symbol is instantiated, I want it to display the Gate Finger Width property of its child instances PFET and NFET on the symbol.

i.e., whenever the inverter symbol is instantiated, it takes in Pn as the "Number of fins per finger" for pfet, and uses it to compute pfet's "Gate Finger Width" at the lower hierarchy, but after computing this value (Gate Finger Width) it should also be displayed on the top level inverter symbol as its property. 

Please guide me.

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