Working with Backdrilling in Allegro PCB Designer: Best Practices
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Backdrill Analysis report showing stub violations from disabled layer pair
Tool Tip – The Plunges column can be used to determine which backdrill layer pairs
are underutilized and Backdrill Analysis report will display the Net Name, Object, X-Y
locations, and so on so that these can be investigated.
Reviewing the routing at the backdrill site to assess if there is an opportunity to reroute
the connection to eliminate the underutilized backdrill layer pair and avoid the extra
backdrill process at the fabrication vendor. You can also disable the layer pair to isolate
the locations on the underutilized layer pairs and have these reported as errors.
Tool Tip – After revising routing to reduce the number of backdrill layer pairs, run
Analysis again from the Backdrill Setup and Analysis to review the backdrill results.
Disabled layer pairs can be deleted using RMB > Delete Pair over the disabled row.
