versatile_FFT core has no output

I am trying to use
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, but after I run "make all", data_out.txt and res.txt are all empty.
Anyone have same experience ?
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_Xilinx
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Are you feeding it real inputs and doing anything with the outputs?
Synthesis tools are really good at figuring out what logic isn't being used, and trimming it. It's pretty common to make something just to see if it'll synthesize and find out that it's not there because you gave it constant inputs or didn't bring the outputs to pins.
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Tim Wescott 
Control systems, embedded software and circuit design 
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Tim Wescott

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