Allegro Front to Back User Guide

Allegro Front-to-Back User Guide Designing Layout October 2019 51 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Creating a Board Outline The board outline defines the area within which the components in your board will be placed and routed. A board outline can be of any closed shape. Creating Symbols and Padstacks Before you import your logic design from logic design tools into Allegro PCB and Package, you need to create symbols and padstacks. A symbol is a set of data that can be used to represent any design element. A padstack is a file that contains information for each layer in a design. ■ Package/Part (.psm) ■ Mechanical (.bsm) ■ Format (.osm) ■ Shape (.ssm) ■ Flash (.fsm) Once you create a symbol, you can save it in a library so that you can reuse the symbol. After you load a library symbol into your layout, Allegro PCB and Package uses that symbol definition for future instantiations. If that symbol does not exist in your layout, Allegro PCB and Package looks for the symbol in the library. Importing Logic The Import Logic dialog box is displayed when you run the netin command. It is the interface from which you load the logic for your design into the Allegro PCB and Package database and establish the operating characteristics for the netrev utility. The transfer of logic from logic design tools is governed by the constraint Manager-enabled flow. Defining Layers A layer is an insulated plane in the design that contains lines of etch. The ordered stack of layers in your design is also called the cross section. Before you begin placement and routing, you define layers and their various characteristics as part of setting up your layout. While you place and route, you might need to insert extra

• 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