dc_topo interconnect estimation versus icc interconnect estimation while placement

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sudheerkolamala

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hi guys,

i observed in my design that there is significant difference between syn and place WNS and TNS.
why does syn has higher numbers of WNS,TNS compared to place.
DC_topo does some coarse placement for rc estimation,
1.does dc do more buffering than icc placement?
2.is the rc estimation more pessimistic in dc than ICC?

thanks,
sudheer
 

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