Allegro Front to Back User Guide

Allegro Front-to-Back User Guide Designing Layout October 2019 53 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. from the PCB Editor. Once the route is completed, all route information is automatically passed back to the PCB Editor. Routing is the process of making electrical connections in your design. You can route interactively or automatically. You can also specify the order in which pins are routed on a particular net. Increased design complexity, density, and high-speed routing constraints make manual routing of PCBs difficult and time-consuming. The challenges inherent in complex interconnect routing are best addressed with powerful, automated technology. The robust, production proven autorouter includes a batch routing mode with extensive user-defined routing strategy control as well as built-in automatic strategy capabilities Design Synchronization In the design synchronization phase, you bring the schematic and the PCB Editor board in sync. You resolve both property and connectivity changes between the schematic and the board. Need for Synchronization You need to synchronize the changes that occur on 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: Types of Changes Description Component changes You can add new components in the design to handle signal integrity and electromagnetic compatibility problems. Connectivity changes You can 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. Reference designator changes You can change reference designators to debug board problems.

• 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