Allegro Front to Back User Guide

Allegro Front-to-Back User Guide Capturing Logical Design Constraints October 2019 33 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Using Constraint Manager with Design Capture Tools You can create and modify electrical constraints in Constraint Manager connected to System Capture, DE-HDL or OrCAD Capture. 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 Allegro System Capture provides a docked Constraint Manager that uses the same database as Allegro Constraints Manager. You can edit constraints on the currently selected object(s) on the canvas, and capture all the Electrical constraints, as well as apply all types of Constraints Sets from the docked Constraint Manager. You can also access Allegro Constraint Manage from System Capture and: ■ Enable Auto-Creation of Differential Pairs ■ Automatically Create XNets without DML Models ■ Extract Topology for an XNet in SigXplorer ■ Create ECSets based on Extracted Topology ■ Import ECSets For more information about constraints in System Capture, refer to the Managing the High Speed Constraints Flow section of the Schematic Design using System Capture guide. Capturing Constraints in Design Entry HDL Sharing Constraint Information with Physical Design Tools The data flow from the logic design capture tool, to physical layout tool is referred to as front -to-back flow. For sharing data with the physical layout tool, design capture tools use the Export Physical command. Using Export Physical command generates a set of package files that contain information about electrical constraints and the netlist. In this flow, Constraint Manager stores information about constraints in a file named .dcfx (.dcf), which is created in the sch_1 folder in a ZIP format. The.dcf file is a binary file, which, when extracted, creates

• 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