#671 High Clk Skew number observed with Latest OpenRoad CTS Tool New issue created by dineshannayya Openroad version: v2.0-1424-gf864efbae I am trying to harden small design with Openlane flow with MPW-3 Tag. I see Clk Skew number in order of 2.33ns. If if use the same design in Openlane:RC7 tag the skew number are with-in 0.12ns or 130ps 1. Here is the Clock Skew Number with Openroad version: v2.0-1424-gf864efbae Clock bist_clk Latency CRPR Skew _1822_/CLK ^ 3.67 _1704_/CLK ^ 1.34 0.00 2.33 wns -3.88 tns -131.54 Attached the Example Setup: mpw-3.tar.gz 2. Here is result based on RC7 Tag & Clock Skew are in the order of 0.12ns or 130ps Clock bist_clk Latency CRPR Skew _1771_/CLK ^ 0.56 _1794_/CLK ^ 0.44 0.00 0.12 wns 0.00 tns 0.00 Attached the Example Setup mpw-2.tar.gz I have used or_cts.tcl file from openlane for my analysis. One observation: In MPW-3 CTS uses both slow and fast corner library where as MPW-2 CTS uses only one corner Typical corner library .. Not clear is CTS reporting worst violation between two corner (Slow and Fast corner) ? The-OpenROAD-Project/OpenLane