OrCAD X Resources

Contents Part 1 - Introduction to Constraint Management ................... 3 What is Constraint Management?............................................... 3 Problems Solved by Constraint Management ........................ 3 Benefits of Proper Constraint Management ............................ 3 Applications of Constraint Management .................................. 4 Finding the Constraint Manager (CM) ........................................ 4 Understanding How the Constraint Manager Works ............. 5 Types of Constraints ....................................................................... 7 Electrical Constraints ............................................................ 7 Physical Constraints .............................................................. 7 Spacing Constraints .............................................................. 7 Manufacturing Constraints.................................................. 7 High-Speed Design Constraints ........................................8 Understanding Net Classes, Net Groups, and Regions in PCB Design .................................................................................................8 1. Net Classes ...........................................................................8 Example - Creating a Net Class ..................................... 9 2. Net Groups ......................................................................... 13 Example - Create a Net Group...................................... 14 3. Regions................................................................................ 18 Region Physical Constraint Set.................................... 18 Region Spacing Constraint Set .................................... 21 Manual Constraint Entry vs. Constraint Sets ...........24 Applying The Constraint Region ..................................25 Key Differences and Implications Among Net Classes, Groups, and Constraint Regions ................................. 28 Summary ..........................................................................................29 Conclusion to Part 1 ......................................................................29 2 www.cadence.com OrCAD X Constraint Management Guide

• 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