Issue link: https://resources.pcb.cadence.com/i/1532922
Standard DRCs In the following sections we will show you the constraint sets that are created and then the nets (and objects) those constraint sets apply to. Applying Standard PCB Constraints With the Constraint Manager open, we need to set various constraints for the PCB. Standard Electrical Constraints Even in some low-speed boards, we need 50 Ohms of Impedance. So we set the impedance to 50 ohms for single-ended PCBs at 10% tolerance, since that is what most manufacturers can handle. Then that impedance gets applied to whichever net it applies to. Like the CLOCK+ and CLOCK- signals below: The rest of the constraints are in the high-speed applications section later in this guide. Standard Physical Constraints For physical constraints we have the following: Trace Width Trace Width (Line Width) is set in the Physical CSet to 0.500 mm (19.685 mils) for power traces. 34 www.cadence.com OrCAD X Constraint Management Guide