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What is the relationship between preroute extraction and congestion calculation?

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ttxs

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To my understanding preroute extraction is to simply calculate r_per_um and c_per_um on each grid of the floorplan, before routing.
Congestion calculation happens after routing, to reflect congestion_H and congestion_V.

Is my understanding correct? Does congestion calculation requite any results of preroute extraction?
 

ttxs said:
To my understanding preroute extraction is to simply calculate r_per_um and c_per_um on each grid of the floorplan, before routing.
Congestion calculation happens after routing, to reflect congestion_H and congestion_V.

Is my understanding correct? Does congestion calculation requite any results of preroute extraction?
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completely different concepts, no relationship. extraction is to calculate Rs and Cs, preroute extraction is just the lowest quality extraction there is. congestion is to mesure the utilization of routing resources.
 
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