Cadence PCB Best Practices

Working with Backdrilling Backdrilling October 2019 52 Product Version 17.4-2019 © 1999-2020 All Rights Reserved. Figure 1-25 Backdrill Legend Output Tip To support the new enhanced backdrill functionality, the backdrill legend format has been enhanced and required an update to the NC Drill Legend template file (*.dlt) You may find new column definitions, backdrill notes, and so on. If you are using a local copy of the template file from a previous release it is recommended to retrieve the latest copy of the DLT files from the installation hierarchy in order to fully support the software enhancements for this release. You can find the DLT file at the following location: \share\pcb\text\nclegend

• Cover
• Contents
• Backdrilling
• Introduction
• Licensing
• Prerequisites
• Backdrill Commands, Properties, Parameters, and Subclasses
• Terminology
• Net Identification
• Applying the BACKDRILL_MAX_PTH_STUB Property in Constraint Manager
• Stub Calculation
• Pin Plating Restrictions
• Applying the Minimum Pin Plating Property
• Pressfit Connectors
• Backdrill Exclusions
• User Overrides
• Fabrication Vendor Backdrill requirements (Reference Only)
• Setup and Analysis User Interface
• Initially Launching the Backdrill Setup and Analysis Dialog Box
• Prior to executing Backdrill
• Padstack Parameters Tab of the Backdrill Setup and Analysis Form
• Flag Codes tab of the Backdrill Setup and Analysis form
• Final Backdrill Steps – Executing Backdrill
• Manufacturing Stub Length Analysis (Drill Parameters Tab)
• Effects of Setting a Manufacturing Stub Length:
• Layer Pairs tab feedback – Depth column yellow cells:
• Backdrill Canvas Display Controls
• Backdrill Data Show Element visibility (Pins/Vias)
• DRC and Shape Voiding
• Board Testability
• NC Drill and Legend Output
• Enabling Backdrill Output
• NC Backdrill Legends
• Legend Customization
• Backdrill Cross Section Chart Display