Working with Backdrilling in Allegro PCB Designer: Best Practices
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NC Drill Legend dialog
In the following figure, the NC Drill Legend accounts for all the sites to be backdrilled
from the layer BOTTOM through the layer LAYER_9_P into the dielectric layer between
LAYER_9_P and LAYER_8. The actual depth range into the dielectric material might
vary from vendor to vendor because there are many fabrication tolerances to consider.
Hence, Cadence makes no effort to supply controlled depth data but provides depth to
the surface of the Must Not Cut Layer for reference.
