Can dsp.HDLFFT have controls on gate count, dimension and data width?

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imcuser1 2017-9-8

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评论： imcuser1 2017-9-15

I managed to generate some FFT from dsp.HDLFFT and it works nicely. My first question is, My FFT application has variable dimensions from 4K to 64K. Can I achieve that with dsp.HDLFFT? Secondly, can I control the data width growth with saturation and rounding?

Thank you.

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Answer 1

Bharath Venkataraman 2017-9-8

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Current the HDL FFT does not support variable lengths. You can use the largest length needed (64K) and do bin mapping to run the smaller FFT lengths.

You can control bit widths by choosing scaling (every section gets divided by 2 and the output and input lengths stay the same). Not choosing scaling causes each section to grow an additional bit.