Design Entry Overview
Design entry is the first step in the ISE® design flow. During design entry, you create source files to represent your design. The top-level design source file can be any of the following formats:
  •  Hardware Description Language (HDL), such as VHDL or Verilog
  •  Schematic (SCH)
  •  Embedded processor (XMP)
  •  EDIF or NGC/NGO file (if you choose to synthesize your design outside of Project Navigator)
For HDL and schematic top-level designs, lower-level source files can be multiple formats, including HDL, schematic, IP, and netlist. For EDIF or NGC/NGO netlist top-level designs, the EDIF or NGC/NGO file is the only source file allowed in the project.
You can create new source files that are automatically added to your project as described in Creating a Source File. You can also add existing source files to your project as described in Adding a Source File to a Project. For more information on source files, see Source File Types. Some source file types may not be available, depending on your design properties (top-level module type, target device, and synthesis tool).
Note  You cannot add lower-level EDIF or NGC/NGO netlists directly to a project. However, if the design contains lower-level netlists, these files are automatically linked to the design during the Translate step of the Implement Design process. The lower-level netlists must be in the same directory as the top-level netlist, or you must point to the lower-level netlists using the Macro Search Path property in the Translate Properties dialog box. Image
Additional Resources
Additional information is available in the following Xilinx® documentation.
DocumentationTopics Covered
Synthesis and Simulation Design GuideHigh-density design flow and recommended coding styles
XST User GuideHDL coding techniques
Command Line Tools User GuideCommand line software programs in the Xilinx Development System
Application NotesTechnical details
See Also

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