Using Differential Pairs in Allegro PCB Editor
February 9, 2012 14 Product Version 16.5
3. Create a Spacing Constraint Set (SCSet) with specific spacing rules for the DPs.
a. In the SPACING domain of Constraint Manager, select the Spacing
Constraint Set > All or By Layer(s) worksheet.
b. Right-click on the design name in the Objects column and select Create > Spacing
Set.
c. Enter a meaningful name (DP_SP) and click OK.
d. Enter the required DP line-to-line spacing constraint for the SCSet.
4. Create a Net Spacing Class (NCLs) and assign all DPs to the same class.
a. In the SPACING domain of Constraint Manager, select the Net > All
Layers worksheet
b. Under the Objects column, select all DP objects.
c. Right-click on one of the selected objects and choose Create > Net Class.
d. Enter a meaningful name (DP_CLASS) and click OK.
5. Assign the SCSet from step 3 to the NCls.
a. In the SPACING domain of Constraint Manager, select the Net > All Layers
worksheet.
b. Select the Referenced Spacing CSet cell for the NCls row and select the SCSet
that was created in step 3 above.
Testing
