NGD2EDIF Files

This section describes the NGD2EDIF input and output files.

Input Files

Input to the NGD2EDIF program can be either of the following files.

• NGA file - a back-annotated logical design file containing Xilinx primitive components
  
  
• NGD file - a logical design file containing Xilinx primitive components
  
  

Output Files

Output from NGD2EDIF consists of the following files.

• EDN file - a netlist in EDIF format. The default EDN file produced by NGD2EDIF is generic. If you want to produce EDIF targeted to Mentor Graphics or Viewlogic, you must include the
  -v option (described in the “-v (Vendor)” section) on the command line.
  
  
• XMM file - an optional RAM initialization file, which defines the initial contents of the RAMs in the design for the simulator. The file is described in the “XMM (RAM Initialization) File” section.
  
  

If an XMM file is generated, it has the same base name and is written into the same directory as the output EDIF netlist.