OrCAD X Resources

20. Return to Spacing - Region - All Layers spreadsheet. 21. Right-click the cell that says SCS_BGA-REGION, where we've applied this spacing constraint set, then choose Clear (notice that the values changed to ***'s and 0.070's). 22. Now, left-click that blank cell and choose SCS_BGA-REGION again. Notice that the 0.070 value does not change. 23. Select all the cells in that row, then hit Delete on your keyboard until all your custom values are deleted. The spacing constraint set values will update to the original 0.076 found in the SCS_BGA-REGION rules (see below). APPLYING THE CONSTRAINT REGION Now that we have set the physical and spacing regions and created and applied physical and spacing rule sets just for those regions, we are ready to apply all those region-specific rules to an area of the PCB. 1. Take note of the BGA-REGION name. Close the CM. 2. Even though the CM automatically applies the rules, save the design (Ctrl + S) first. 3. In OrCAD X Presto PCB Editor, right-click the Add Shape icon found on the quick access toolbar, then select Add Shape. 25 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