PAR Files

This section describes the PAR input and output files.

Input Files

Input to PAR consists of the following files.

• NCD file - a mapped design.
  
  
• PCF file - an ASCII file containing constraints based on attributes in the schematic or on constraints you have placed in a UCF file. A complete list of constraints can be found in the “Attributes, Constraints, and Carry Logic” chapter of the Libraries Guide. PAR supports all of the timing constraints described in that chapter.
  
  
• Guide NCD file - an optional template file for placing and routing the design.
  
  

Output Files

Output from PAR consists of the following files.

• NCD file - a placed and routed design file (may contain placement and routing information in varying degrees of completion).
  
  
• PAR file - a PAR report including summary information of all placement and routing iterations.
  
  
• DLY file - a file containing delay information for each net in the design.
  
  
• PAD file - a file containing I/O pin assignments.
  
  

• Guide Report File - a file created if you use the -gf option
  
  
• Intermediate Failing Timespec Summary - a summary generated for failing timing specifications
  
  
• Xilinx Par Information - This XPI report displays whether or not the design routed and if timing specifications were met.