Working with Backdrilling in Allegro PCB Designer: Best Practices
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"Must Not Cut Layer" surface outside minimum pin plating depth
"Must Not Cut Layer" inside minimum pin plating depth
Automatic Layer pair shift to allow backdrill outside min pin plating depth
Tool Tip – The Backdrill code will stop the backdrill at the layer before the "Must Not
Cut Layer" (Connection Layer) called the "To Layer", preserving the adjacent dielectric
layer. The fabrication vendor can backdrill further into the adjacent dielectric layer to
remove as much electrical stub as possible, without compromising the "Must Not Cut
Layer".
