Issue link: https://resources.pcb.cadence.com/i/1532922
12. Now you have a net group you can further create constraints (see below). We will not create constraints here, but they will come in handy after all our groups, net classes and regions are set up. Next consider making a constraint region for the DDR2 and DDR3 devices. Decide On Constraint Regions In this schematic, we have memory modules and devices that will likely need special routing spacing. So let us make two constraint regions in preparation for that, even if we do not have to use them later. 1. Open the Constraint Manager in OrCAD X Capture. 2. In the constraint manager, go to Physical > Region > All Layers. We already have a region defined named BGA, but let's add DDR2 and DDR3 just in case we need special rules for those trace widths in that area of the PCB. In the image below, you can see the areas and chips where the BGA region would apply on the PCB. 8 www.cadence.com OrCAD X Constraint Management Guide