Issue link: https://resources.pcb.cadence.com/i/1532920
Impact on the Board: f Improves overall reliability and performance of the PCB in various electromagnetic environments f Ensures compliance with regulatory standards, which is essential for product certification and market entry f May influence component placement, routing strategies, and layer stack-up decisions f This can lead to the inclusion of additional shielding or filtering components f It might require changes in trace routing to minimize crosstalk and emissions By implementing proper EMC and EMI constraints like return path checking, designers can create PCBs that not only function well but also meet the stringent electromagnetic compatibility requirements of modern electronic devices. High-speed constraints/electrical design rules: Min/max relative propagation delay: Controlling signal timing Definition: Managing the propagation delay of signals to ensure they arrive at their destination at the correct time. Example: Ensuring that critical signals have minimal delay to synchronize with other signals. Steps: To set the signal propagation delay: 1. Go to the following worksheet: Electrical > Routing > Min/Max Propagation Delays. 2. You can create your desired constraint set, but let's look at the existing ones shown below. 3. You can choose the pin pairs (transmitter and receiver) that will be on either side of the signal being propagated through the respective trace. 4. Choose the Pin Pairs based on your design criteria. 5. Next you can apply the constraint in the worksheet called Net > Routing > Min/Max Propagation Delays 6. Notice that once you apply your constraint set, you can right click on the nets of interest, then choose Analyze, then the constraint manager will let you know in the Prop Delay columns whether those nets have the actual propagation delays you need in the board. 9 www.cadence.com OrCAD X Constraint Management Guide