After designing new circuit , that must be converted in to layout for implement on Silicon wafer. so every code first converted in to netlist (circuit in terms of delays and wire)
then layout , for Layout design we must go with Physical design tools(CAD tools) like cadance SOC encounter for complex circuit , Virtuoso for custom design , or IC Station
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Floorplan , routing, partition and Pre CTC, Post CTC are done by CAD tools in physical desing