Once deleted, go back to the Physical > Net > All Layers worksheet. Notice for AD_DB0 how the Referenced Physical CSet
changed back to DEFAULT and no longer has PCS1.
Differential Pair Constraints (Physical)
Constraint Manager has two ways to manage differential pair constraints, electrical and physical. The physical constraints are
implemented the same way as the electrical constraints. However, the physical constraints for differential pairs specify
allowing Etch (copper) or Ts, while the electrical constraints for differential pairs do not have those options.
Follow similar instructions to set a differential pair constraint set and you can apply them to any differential pair within the Net
> All Layers worksheet. See images below to see the constraint and application.
That's to create a differential pair. But let's delete it, we will use the existing differential pair physical constraint set named
100R_DIFF.
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OrCAD X High-Speed Digital Design Guide
