NGDAnno Options

This section contains descriptions of NGDAnno command line options.

-f (Execute Commands File)

-f command_file

The -f option executes the command line arguments in the specified command_file. For more information on the -f option, see the “-f Option” section of the “Introduction” chapter.

-o (Output File Name)

-o out_file[.nga]

The -o option specifies the output design file in NGA format. The .nga extension is optional. The output file name and its location are determined in this way.

• If you do not specify an output file name with the -o option, the output file has the same name as the input NCD file, with an .nga extension. The file is placed in the input NCD file's directory.
  
  
• If you specify an output file name with no path specifier (for example, cpu_dec.nga instead of /home/designs/cpu_dec.nga), the NGA file is placed in the current working directory.
  
  
• If you specify an output file name with a full path specifier (for example, /home/designs/cpu_dec.nga), the output file is placed in the specified directory.
  
  

If the output file already exists, it is overwritten with the new NGA file.

-p (PCF File)

-p pcf_file.pcf

The -p option allows you to specify a PCF (Physical Constraints) file as input to NGDAnno. You only need to specify a constraints file if it contains the following.

• Level information (CMOS or TTL) for IOBs in a 4000E or 4000EX design
  
  
• Prorating constraints
  
  

Prorating constraints and prorated delays are described in the “OFFSET Timing Specifications” section of the “Using Timing Constraints” chapter.

-s (Change Speed)

-s [speed]

The -s option instructs NGDAnno to annotate the device speed you specify to the NGA file.

The device speed can be entered with or without the leading dash. For example, both -s 3 and -s -3 are allowable entries.

Some architectures support the -s min option. This option instructs NGDAnno to annotate a minimum delay, rather than a maximum worst-case delay, to the NGA file. The command line syntax is the following.

-s min

-s -min is not an allowable entry.

NOTE

Settings made with the -s min option override any prorated timing analysis.