Enquiry about the tool Encounter

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aditya1579

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Hi All,

During the standard cell placement, there are no real routes. Then how does the tool do the timing ?

Is it based on some estimation technique like Steiner routes etc ?

Aditya
 

the timing is done through estimated parasitic depending on the fanout of the gates. The cell size is available, pin_cap on the nets is there and parasitic tables are available. It is just an estimate.
 

During the placement, the tool does a non-drc clean global routing, called as trial-route, to help the parasitic estimation.
 

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