Issue link: https://resources.pcb.cadence.com/i/1532919
Tip: You can repeat this general procedure for any number of nets: Set the constraints/rule set, then apply to the appropriate net, net class, or net group. You may also directly type in/apply to specific nets or classes by typing them in, but that is not recommended as the first option. Manage what you can through constraint sets only. Reason: Trace width ensures proper current-carrying capacity and signal integrity. Impact: Balances manufacturability with electrical performance. Note: Setting the trace width in the Physical section does not necessarily mean you meet the manufacturer's minimum trace width limits. Please be mindful that you can set any value in the Physical domain for trace (line) width. But if you do not follow the rules for your manufacturer, you can have a rude awakening that will force you to reroute the entire PCB again. Related Constraints: Design for Manufacturing - Trace width. Neck mode: Minimum trace width when routing into smaller spaces Purpose: Allow traces to enter a smaller area (e.g., a BGA Constraint region, shown in Part 1 of this document) by becoming thinner momentarily and for a certain distance. Steps to Create a Neck Mode Constraint: 1. Open Constraint Manager. 1. Navigate to the spreadsheet Physical > Physical Constraint Set > All Layers. 2. You will see all the constraint sets that were created. You can create your own by right-clicking the cell containing the design name P3349_B01_Allegro_layout_BG (the name of your .BRD file/Design), then choosing Create - Physical CSet. 3. In the pop-up window, give the PhysicalCSet an appropriate name. 5 www.cadence.com OrCAD X Constraint Management Guide