Xilinx 8.2i manual BitGen Input Files, BitGen Output Files

R

BitGen Input Files

pcf_file is the name of a physical constraints file. BitGen uses this file to interpret CONFIG constraints, which control bitstream options. These CONFIG constraints override default behavior and can be overridden by configuration options. See “–g (Set Configuration).” BitGen automatically reads the .pcf file by default. If the PCF is the second file specified on the command line, it must have a .pcf extension. If it is the third file specified, the extension is optional; .pcf is assumed. If a .pcf file name is specified, it must exist; otherwise, the input design name with a .pcf extension is assumed.

Type the following syntax to see a complete list of BitGen command line options and supported devices:

bitgen —h

BitGen Input Files

Input to BitGen comprises the following files:

•NCD file—a physical description of the design mapped, placed and routed in the target device. The NCD file must be fully routed.

•PCF—an optional user-modifiable ASCII Physical Constraints File.

•NKY—an optional encryption key file.

Note: For more information on encryption, see the following web site:

http://www.xilinx.com/products.

BitGen Output Files

Output from BitGen comprises the following files:

Table 14-1:BitGen Output Files

Output File Type	Output File Description
.bgn	Contains log information for the BitGen run, including
	command line options, errors, and warnings. Always produced.
.bin	A binary file that contains only configuration data. The .bin has
	no header like the .bit file. Produced when –g Binary:Yes is
	specified.
.bit	A binary file that contains proprietary header information as
	well as configuration data. Meant for input to other Xilinx tools,
	such as PROMGen and iMPACT. Always produced unless the -
	j option is specified.
.drc	A design rule check (DRC) file for the design. Contains log
	information or Design Rules Checker, including errors and
	warnings. Always produced unless the -d option is specified.
.isc	Contains the configuration data in IEEE1532 format. Produced
	when -g IEEE:1532:Yes is specified.
.ll	An ASCIII file that contains information on each of the nodes in
	the design that can be captured for readback. The file contains
	the absolute bit position in the readback stream, frame address,
	frame offset, logic resource used, and name of the component in
	the design. Produced when the -l option is specified.

Development System Reference Guide www.xilinx.com 259