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Altera_Forum's avatar
Altera_Forum
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14 years ago

Config compression makes no difference

I ran my Cyclone 3 design with and without compressed config file generation & in both cases the .sof file came out to be 350KB. No change with compression. Did I miss some Quartus setti...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

It should be.. somewhere. :)

- .SOF files are always the same size for a given FPGA device, because they're never compressed.

- .POF files are always the same size for a given ROM device because they specify the contents of the entire ROM, even if it's blanks. Compression, however, lets you cram more stuff into a smaller ROM, as you just found out.

- .JIC files are always the same size for a given FPGA and ROM combination due to the above.

- .RBF files are the only ones that become smaller with compression, because they contain the raw compressed bitstream.