Dear all, I am using Assura to perform DRC. There is a problem i cannot solve. In layout, i have used "MET1 (pn)" and named by "Vdd!" for the substrate contact of PMOS, but there is still a DRC error of "HOT_NTUB", that is the separation of DIFF to NTUB. Normally, the distance should be Vdd's NTUB to DIFF = 1.2, but DRC think it is NON-Vdd's NTUB to DIFF= 2.6. Could anyone tell me how to let the Assura know it is Vdd region? THANKS! Best Regards, Raymond