There are three types of DRC runs that can be performed on a design with dft_drc:RTL DRC: run during RTL development phase to identify DFT issue early in the flowPre-DFT DRC: run prior to scan insertion to determine which scanable elements can be put on scan chainsPost-DFT DRC: run after scan insertion to validate that the implemented scan chains can be tracedCan be used to provide an ATPG coverage estimateCan extract (infer) scan chain information from an design with existing scan chains