Issue link: https://resources.pcb.cadence.com/i/1532922
Return Path By clicking the options shown below, you can set the GND EARTH net as the return path for your DDR3 Electrical Constraint Set and clicking Ok. Then fill in the rest of the details shown below: f Reference Net(s) – GND EARTH f Reference Layer(s) – Closest Plane f Length Ignore – 25 mils (0.635 mm) f Max Pad Gap – 10 mils (0.254 mm) f Max Stitch Via Distance – 20 mils (0.508 mm) f Adjacent Void Spacing – 60 mils (1.5 mm) These values assume transfer rates in the 3.5 GHz to 5 GHz ranges and 10 picoseconds to 30 picosecond signal rise times. 18 www.cadence.com OrCAD X Constraint Management Guide