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Development System Reference Guide www.xilinx.com 287
PROMGen Options
R
PROMGen Options
This section describes the options that are available for the PROMGen command.
–b (Disable Bit Swapping—HEX Format Only)
This option only applies if the –p option specifies a HEX file for the output of PROMGen.
By default (no –b option), bits in the HEX file are swapped compared to bits in the input
BIT files. If you enter a –b option, the bits are not swapped. Bit swapping is described in
“Bit Swapping in PROM Files”.
–c (Checksum)
promgen –c
The –c option generates a checksum value appearing in the .prm file. This value should
match the checksum in the prom programmer. Use this option to verify that correct data
was programmed into the prom.
–d (Load Downward)
promgen –d hexaddress0 filename filename...
This option loads one or more BIT files from the starting address in a downward direction.
Specifying several files after this option causes the files to be concatenated in a daisy chain.
You can specify multiple –d options to load files at different addresses. You must specify
this option immediately before the input bitstream file.
Here is the multiple file syntax.
promgen –d
hexaddress0 filename filename...
Here is the multiple –d options syntax.
promgen –d
hexaddress1 filename -d hexaddress2 filename...
–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 “–f (Execute Commands File)” in Chapter 1.
–i (Select Initial Version)
–i version
The –i option is used to specify the initial version for a Xilinx multi-bank PROM.
–l (Disable Length Count)
promgen –l
The –l option disables the length counter in the FPGA bitstream. Use this option when
chaining together bitstreams exceeding the 24 bit limit imposed by the length counter.