Issue link: https://resources.pcb.cadence.com/i/1180264
Working with Backdrilling Backdrilling October 2019 51 Product Version 17.4-2019 © 1999-2020 All Rights Reserved. ■ Drill sizes listed in legend are the actual backdrill size ■ Must Not Cut Layer and depth to the surface of the Must Not Cut Layer ■ Legend does not specify depth into adjacent dielectric layer. It is controlled by fabrication vendor Figure 1-24 NC Drill Legend Dialog In the following figure, the NC Drill legend accounts for all sites to be backdrilled from the layer BOTTOM through layer LAYER_9_P into the dielectric layer between LAYER_9_P and LAYER_8. The actual depth range into the dielectric material may vary from vendor to vendor as 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.