Allegro Front to Back User Guide

Allegro Front-to-Back User Guide Designing Layout October 2019 54 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Generating Manufacturing Output This section highlights the tasks and Allegro PCB and Package features used to generate output for the manufacturing process: ■ Creating NC Drill data ■ Generating silkscreens ■ Generating pen plots ■ Creating artwork ■ Drafting and dimensioning Physical Layout using OrCAD Capture After creating a schematic and verifying the logic, the next step in the design process is to create the physical layout of the PCB board in PCB Editor; the Cadence tool for designing physical layout of a PCB board. Capture offers full integration with Cadence® PCB Editor tool suite, allowing you to use all of Capture schematic design capabilities to enter your PCB projects, then export the information to PCB Editor for layout and routing. While the actual board design tasks are performed in PCB Editor, there are a few tasks that must be performed in Capture to prepare the schematic for the layout. Following are the design tasks and the best practices must be followed during the schematic capture stage to ensure that process of exporting data to PCB Editor is completed smoothly: ■ Preparing the Schematic for Layout ■ Property Flow from Capture to PCB Editor ■ Generating Initial Board File ■ Backannotation from PCB Editor ■ Running Design Rules Check - Physical Rules Property changes You can modify certain components in the board. These modifications will cause property changes.

• Cover
• c contents - Contents
• Preface
• About the Front-to-Back Flow
• How This Book is Organized
• Creating and Managing Libraries
• Allegro Front-end Tools Libraries
• Library Structure
• Creating and Managing Libraries
• OrCAD Libraries
• Capturing Logical Design
• Creating Project Using Allegro Tools
• System Capture
• You can also perform other page manipulation operations, such as creating a new page or deleting an existing page from the Project viewer. You can drag and move the pages up and down to change their order in the Project viewer.
• Allegro Design Entry HDL
• Creating Project Using OrCAD Capture
• Creating a Schematic
• Designing Schematic Using System Capture
• Creating Schematic Using OrCAD Capture
• Capturing Logical Designs using DE-HDL
• Capturing Logical Design Constraints
• Why Constraint Manager?
• Using Constraint Manager with Design Capture Tools
• All the constraints are stored in the Constraint Manager Database (CMDB) and saved in the dictionary and constraints file designname.dcf.
• Constraints in System Capture
• Capturing Constraints in Design Entry HDL
• Capturing Constraints in OrCAD Capture
• Creating Variants of Your Design
• Managing Variants in System Capture
• Creating Variants using Variant Editor
• Getting Logical Design Ready for Physical Layout
• Preparing a System Capture Design for Physical Layout
• Preparing a DE-HDL Design for Physical Layout
• Exporting a DE-HDL Design
• Forward Mode
• Preparing an OrCAD Capture Design for Physical Layout
• Exporting an OrCAD Capture
• Annotating the Design
• Packaging Your Design (Advanced)
• Generating a Bill of Materials
• Updating the Schematic With the Changes in the Board
• Passing Properties from the Layout to Schematic
• Designing Layout
• Physical Layout using OrCAD PCB Editor
• Creating a Board Outline
• Creating Symbols and Padstacks
• Importing Logic
• Defining Layers
• Defining Constraints
• Placement
• Routing
• Design Synchronization
• Physical Layout using OrCAD Capture
• Preparing the Schematic for Layout
• Property Flow from Capture to PCB Editor
• Generating Initial Board File
• Backannotation from PCB Editor
• Running Design Rules Check - Physical Rules
• Capturing Physical Constraints
• Using Constraint Manager with PCB Editor
• Synchronizing Schematics and Boards
• Need for Synchronization
• Design Synchronization Tasks
• Feedback Mode