Issue link: https://resources.pcb.cadence.com/i/1532919
4. Set via types you want from the library (vias found on the left), then double-click to place them among the list of usable via the list on the right. These vias will be applied to the specific row net, class, group, or region to be selected when you open the window from the CM. 5. Once the list is satisfactory, you may organize the vias by highlighting the via name (on the list to the right) and using the Up and Down buttons in the window. 6. Use the above steps to apply specific via types (through-hole, blind, buried, or microvias) to any net classes, groups, and constraint regions. Note: While you can modify padstacks within OrCAD X PCB Editor, you cannot directly create them. You will need to use the Padstack Editor tool to create them, and then you can use the Constraint Manager to add padstacks to your design. Reason for Padstacks: Proper padstack selection ensures reliable layer-to-layer connections while optimizing board space and manufacturability. Impact: Balances electrical performance with manufacturing constraints and cost considerations. Related to: Aspect Ratio, Annular Ring Differential Pairs (Basic Setup) Purpose: Defines the minimum and maximum widths and spacing for differential pair traces to maintain signal integrity. We will focus on the physical constraints in this example. In the high-speed section(s), we will encounter differential pairs again and address the high-speed constraints. Top view of a differential pair showing some width and spacing parameters Reason for Physical Constraints: Setting up physical constraints and forcing symmetry in differential pairs ensures consistent impedance and reduces the chances of signal issues in high-speed signal transmission. In OrCAD X Presto PCB Editor, you want to use physical rules to control your differential pairs as much as possible. 8 www.cadence.com OrCAD X Constraint Management Guide