Virtex-4 FPGA Configuration User Guide www.xilinx.com 55UG071 (v1.12) June 2, 2017Generating PROM FilesRPROMGen reformats the configuration bitstreams by nesting downstream configurationdata into configuration packets for upstream devices. Attempting to program the chain bysending multiple bitstreams to the first device causes the first device to configure and thenignore the subsequent data.PROM Files for SelectMAP ConfigurationThe .mcs file format is most commonly used to program Xilinx serial configurationPROMs that in turn programs a single FPGA in SelectMAP mode. For customconfiguration solutions, the .bin and .hex files are the easiest PROM file formats to usedue to their raw data format. In some cases, additional formatting is required; refer toXilinx Application Note XAPP502 for details.If multiple configuration bitstreams for SelectMAP configuration resides on a singlememory device, the bitstreams must not be combined into a serial daisy chain PROM file.Instead, the target memory device should be programmed with multiple .bin or .hex files.If a single PROM file with multiple, separate data streams is needed, one can be generatedin iMPACT by targeting a Parallel PROM, then selecting the appropriate number of datastreams. This can also be accomplished through the PROMGen command line. Refer tosoftware documentation for details.
