Xilinx 8.2i manual MAP Syntax, Map options infile.ngd pcffile.pcf

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Chapter 7: MAP

R

The output from MAP is an NCD (Native Circuit Description) file—a physical representation of the design mapped to the components in the targeted Xilinx FPGA. The mapped NCD file can then be placed and routed using the PAR program.

The following figure shows the MAP design flow:

NMC

NGD

Macro Definition

Generic Database

 

MAP

PCF

 

Physical Constraints

 

 

NCD

 

Circuit Description

Guide File

(Mapped)

 

Figure 7-1:MAP design flow

MAP Syntax

The following syntax maps your logical design:

map [options] infile[.ngd] [pcf_file[.pcf]]

NGM

MRP

MAP Report

X10247

options can be any number of the MAP command line options listed in the “MAP Options” section of this chapter. They do not need to be listed in any particular order. Separate multiple options with spaces.

infile[.ngd] is the input NGD file. You do not have to enter the .ngd extension, since map looks for an NGD file as input.

pcf_file[.pcf] is the name of the output physical constraints file (PCF). Specifying a physical constraints file name is optional, and you do not have to enter the .pcf extension. If not specified, the physical constraints file name and its location are determined in the following ways:

If you do not specify a physical constraints file name on the command line, the physical constraints file has the same name as the output file, with a .pcf extension. The file is placed in the output file’s directory.

If you specify a physical constraints file with no path specifier (for example, cpu_1.pcf instead of /home/designs/cpu_1.pcf), the .pcf file is placed in the current working directory.

If you specify a physical constraints file name with a full path specifier (for example, /home/designs/cpu_1.pcf), the physical constraints file is placed in the specified directory.

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Xilinx 8.2i manual MAP Syntax, Map options infile.ngd pcffile.pcf