ISE
Creating a Schematic Symbol
A schematic symbol is used to instantiate a module in a schematic design. You can create a schematic symbol from an HDL, CORE Generator™ core, Architecture Wizard IP, or schematic source file. After the symbol is created, you must instantiate the source file in the schematic design by placing the symbol in a schematic. The source file represented by the symbol must be added to the project separately.
Note For CORE Generator cores created within the ISE® project, a symbol file is automatically created during core generation, and you do not need to use this process. To create a schematic symbol for an EDIF or NGC/NGO file, you must use Xilinx® command line programs instead. For more information, see Generating a Symbol from an EDIF or NGC File
To Create a Schematic Symbol
  1.  In the Design panel, select Implementation from the Design View drop-down list. Image
  2.  In the Hierarchy pane, select the source file that contains the design module for which you want to create a schematic symbol.
  3.  In the Processes pane, expand Design Utilities, and double-click Create Schematic Symbol.
    Note If you want to overwrite existing symbols, enable the Overwrite Existing Symbol property in the Symbol Generator Properties dialog box. Image
The symbol is created and is available in your project directory. Symbols are not allowed to have pin names beginning with the characters B_. If the module contains pin names beginning with this sequence, an error will be reported and the symbol generated will not be complete.
To add the symbol to a schematic, see Adding a Symbol Instance.
Note For more information on working with schematics, see the Schematic and Symbol Editors Help. In the Help Viewer, click the Synchronize TOC button Image to view all related Help topics.

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