While in the case of PT, the source-insertion delay value of each corner is different. Since PT calculates source insertion delay independently for each corner using StarRC extraction engine, it is more accurate than PnR tool.Īs shown in Table 1, Innovus will calculate mean source-insertion delay value for virtual_clock_1 in the worst corner (FUNC_m40_SETUP_SS_C_WC in our case), that is 0.379ns and then applies the same to all the setup corners. PT does not take source insertion delay from incoming PnR sdc but calculates it separately for each corner.