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PROMGen reformats the configuration bitstreams by nesting downstream configuration
data into configuration packets for upstream devices. Attempting to program the chain by
sending multiple bitstreams to the first device causes the first device to configure and then
ignore the subsequent data.
PROM Files for SelectMAP Configuration
The .mcs file format is most commonly used to program Xilinx serial configuration
PROMs that in turn programs a single FPGA in SelectMAP mode. For custom
configuration solutions, the .bin and .hex files are the easiest PROM file formats to use
due to their raw data format. In some cases, additional formatting is required; refer to
Xilinx Application Note XAPP502
If multiple configuration bitstreams for SelectMAP configuration resides on a single
memory 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 generated
in iMPACT by targeting a Parallel PROM, then selecting the appropriate number of data
streams. This can also be accomplished through the PROMGen command line. Refer to
software documentation for details.
Virtex-4 FPGA Configuration User Guide
UG071 (v1.12) June 2, 2017
for details.
www.xilinx.com
Generating PROM Files
55
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