Command Line Syntax

Command line syntax always begins with the command line program name. The program name is followed by any options and then file names. Use the following rules when specifying command line options:

Enter options in any order.

Precede options with a hyphen (-) and separate them with spaces.

Be consistent with upper case and lower case.

When an option requires a parameter, separate the parameter from the option by spaces or tabs. For example, the following shows the command line syntax for running PAR with the effort level set to medium:

Correct: par -ol med

Incorrect: par -ol med

When using options that can be specified multiple times, precede the parameter with the option letter. In this example, the -l option shows the list of libraries to search:

Correct: -l xilinxun -l synopsys

Incorrect: -l xilinxun synopsys

Enter parameters that are bound to an option after the option.

Correct: -f command_file

Incorrect: command_file -f

Enter file names in the order specified in the chapter that describes the command line program. In this example the correct order is program, input file, output file, and then physical constraints file.

Correct: par input.ncd output.ncd freq.pcf

Incorrect: par input.ncd freq.pcf output.ncd

Use lower case for all file extensions (for example, .ncd).