OrCAD X Resources

9. Open the Properties panel found on the right of the OrCAD X Presto PCB Editor window. 10. To keep that panel active, click the Pin icon in the upper right corner. For all objects on the PCB canvas, you can select that object then examine its properties in the Properties panel. In the case of our Rectangle, we need to add a Rule Set to it. We do that in the Properties Panel. 11. In the Properties panel, navigate to the Rule Set field, then click the dropdown and select BGA-REGION (the region we created earlier for physical and spacing rules). 12. Press the Escape key (ESC) when finished. The rectangle constraint is placed, and you can modify the rest of the PCB as needed. In this exercise, we created constraint regions with their own spacing and physical rules that apply only to that region type. We saw how such rules can be applied to any area of the PCB, allowing more relaxed or, oftentimes, stricter constraints than on the rest of the PCB. In the next section, we will summarize the differences among net groups, net classes, and regions. 27 www.cadence.com Part 1 of 5

• Cover
• Part 1 - Introduction to Constraint Management
• What is Constraint Management?
• Problems Solved by Constraint Management
• Benefits of Proper Constraint Management
• Applications of Constraint Management
• Finding the Constraint Manager (CM)
• Understanding How the Constraint Manager Works
• Types of Constraints
• Electrical Constraints
• Physical Constraints
• Spacing Constraints
• Manufacturing Constraints
• High-Speed Design Constraints
• Understanding Net Classes, Net Groups, and Regions in PCB Design
• 1. Net Classes
• Example - Creating a Net Class
• 2. Net Groups
• Example - Create a Net Group
• 3. Regions
• Region Physical Constraint Set
• Region Spacing Constraint Set
• Manual Constraint Entry vs. Constraint Sets
• Applying The Constraint Region
• Key Differences and Implications Among Net Classes, Groups, and Constraint Regions
• Summary
• Conclusion to Part 1