Issue link: https://resources.pcb.cadence.com/i/1532920
Contents Part 3 - Advanced Constraints.................................................... 3 Constraint Modes ............................................................................ 3 Signal Integrity ................................................................................. 4 Impedance Control: Specification for controlled impedance traces for high-speed signals ...................... 4 Crosstalk Mitigation: Maximum parallel trace length ... 6 EMC and EMI ......................................................................................8 Return Path ..............................................................................8 High-speed constraints/electrical design rules: ................... 9 Min/max relative propagation delay: Controlling signal timing ......................................................................................... 9 Critical Trace Length............................................................. 11 Length Matching ................................................................... 12 Differential pairs (High-Speed) ......................................... 14 Other High-Speed Constraints .................................................. 16 Wiring topology ...................................................................... 16 Stub limits (Max Stub Length) ...........................................17 Maximum stub exposed length ........................................ 19 Layer restrictions ................................................................. 20 Maximum Via Count ............................................................. 21 Example Constraints for Common Applications ..................22 USB (Universal Serial Bus) Constraints ..........................22 Double Data Rate (DDR) Constraints ..............................23 Rigid-Flex PCB Constraints ...............................................23 RF (Radio Frequency) Circuit Constraints .....................24 Conclusion of Part 3 - Advanced Constraints ......................24 2 www.cadence.com OrCAD X Constraint Management Guide