Allegro Front to Back User Guide

Allegro Front-to-Back User Guide Capturing Logical Design Constraints October 2019 34 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. multiple XML and text files that contain information about constraints and properties that are applied to objects in a design. For more information about viewing a .dcfx (.dcf) file, refer to the Viewing a DCF File section of Allegro Design Entry HDL Reference Guide. For more information, refer to the Allegro ® Design Entry HDL - Constraint Manager User Guide for Constraint Manager connected to Design Entry HDL Capturing Constraints in OrCAD Capture To specify constraints, you can use the existing mode to manage a subset of constraints using the property editor. The Constraint Manager-enabled mode is new and is optional. You can enable this mode at any phase of the PCB design flow and on any of the following: ■ New schematic design ■ Existing schematic design ■ Existing schematic design with PCB layout In the Capture-Constraint Manager flow, Constraint Manager is used to define, manage, and assign constraints on the Capture schematic. The recommended sequence of tasks to manage design constraints using Constraint Manager is: 1. Complete the logical design. 2. Add electrical constraints in Constraint Manager. 3. Create or update the PCB layout. 4. Update electrical, physical, and spacing constraints in the PCB layout. 5. Backannotate logical design to synchronize constraints. You can now specify the physical and spacing constraints in Constraint Manager in Capture. Note: You should avoid simultaneous editing of design objects, such as nets with while assigning and modifying constraints. For more information, refer to: ■ Constraint Manager with OrCAD Capture for Constraint Manager connected to OrCAD Capture.

• 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