Cadence PCB Best Practices

Working with Backdrilling Backdrilling October 2019 28 Product Version 17.4-2019 © 1999-2020 All Rights Reserved. Note: Plunges column remains blank on newly added layer pairs and requires Analyze or Backdrill to be ran for the information to be updated. Tip It is recommended to generate the backdrill layer pairs based on backdrill analysis of the design to ensure that all necessary backdrill layer pairs are generated. Layer pairs based on analysis attempt to completely remove the entire stub regardless of the value assigned to the BACKDRILL_MAX_PTH_STUB as long as a layer pair exists to do so.

• 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