User guide

Spartan-6 FPGA Configuration User Guide www.xilinx.com 113
UG380 (v2.7) October 29, 2014
Bitstream Compression
have the greatest overall compression factor. Similarly, FPGA designs with an empty
column of block RAM have a high compression factor.
The overall benefits of a compressed bitstream are:
• Smaller memory footprint.
• Faster programming time for nonvolatile memory.
• Faster configuration time.
Compression is enabled using the BitGen option -g compress.
Parallel Platform Flash PROMs offer their own compression mechanisms. For more details,
see the “XCFxxP Decompression and Clock Options” chapter in UG161
, Platform Flash
PROM User Guide.