Allegro Front to Back User Guide

Allegro Front-to-Back User Guide Getting Logical Design Ready for Physical Layout October 2019 43 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. In addition to the report, the Design Rules Check tool places error and warning markers on the schematic pages as well. Note: For detailed information about Design Rules Checker in OrCAD Capture, refer to OrCAD Capture User Guide. Exporting an OrCAD Capture Annotating the Design By annotating your design (that is, by assigning reference designators and net names to unnamed parts and electrical connections in your design), you provide the means by which to pass it "downstream" to other layout design tools (PCB Editor, for example) that take it beyond the schematic capture phase of the design. The procedures involved in converting your logical design to physical layout are: ■ Customizing Part References in a Design You can customize the way Capture assigns part references in your design. You can specify a range of part reference values that Capture will use to annotate a schematic page or a hierarchical block in your design. ■ Backannotating When you need to transfer packaging information to your schematic folder from other EDA tools, use the backannotate tool. When you need to backannotate properties, use the Update Properties tool (see To update part or net properties). Using Backannotate, you can import changes created by external tools such as PCB layout packages. Capture uses a simple file format to provide support for gate swapping, for pin swapping, and for changing or adding properties on parts, pins, or nets. If the external tool creates a backannotation file, edit the file to match the format described in Designating pins, gates, or packages for swapping. Backannotating board file information to your schematic design is a matter of creating a report file and reading it back into Capture. ■ Annotating Schematic Information If you make changes to your design in Capture, you can bring those changes into PCB Editor. In addition, you must save your Capture design before you can create a netlist. To forward, annotate schematic information from Capture. Capture includes functionality with which you can forward annotate your schematic data, such that it can be included in a PCB Editor board design.

• 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