Allegro Front to Back User Guide

Allegro Front-to-Back User Guide Synchronizing Schematics and Boards October 2019 64 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Need for Synchronization The primary need for synchronization is caused by changes that occur either in the board or in the schematic after the initial transfer of packaged information to the board. The changes that occur in the board after the initial transfer of packaged information from the schematic are of the following four types: 1. Component changes You may add new components in the design to handle signal integrity and electromagnetic compatibility problems. These components may include termination resistors, series or shunt buffers, and bypass capacitors. 2. Connectivity changes You may make connectivity changes to facilitate routing after the initial placement of components. Connectivity changes may be caused by pin swaps, section swaps, and reference designator (refdes) swaps. 3. Reference designator changes You may change reference designators to debug board problems. 4. Property changes You may modify certain components in the board. These modifications will cause property changes. Design Synchronization Tasks The entire Design Synchronization process can involve the following tasks: 1. Package and export the schematic design to the layout editing tool by running Packager- XL in the Forward mode. 2. Compare the schematic and layout designs. 3. Package the design for feedback by running Packager-XL in the Feedback mode. 4. Backannotate the physical connectivity changes to the schematic. 5. Backannotate the schematic based on information in the board. 6. Run the Packager utilities to complete any or all of the following steps: a. Generating the Bill of Materials

• 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