Answer:
For a given wireload model the delay are estimated based on the number of fanout of the cell driving the net.
Fanout vs net length is tabulated in WLMs.
Values of unit resistance R and unit capacitance C are given in technology file.
Net length varies based on the fanout number.
Once the net length is known delay can be calculated; Sometimes it is again tabulated.
For a given wireload model the delay are estimated based on the number of fanout of the cell driving the net.
Fanout vs net length is tabulated in WLMs.
Values of unit resistance R and unit capacitance C are given in technology file.
Net length varies based on the fanout number.
Once the net length is known delay can be calculated; Sometimes it is again tabulated.
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