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Complex FFT execution Time on DM8148

David Roberts
Prodigy 100 points

Does anyone have any data on the execution time of a 4096 point complex floating point FFT. If you do, specify the clock used, please. I assume that the FFT will run fastest on the DSP block.

Thanks,

- David.

  • 0
    TI__Guru** 116170 points

    David,

    A 4096 point floating point FFT called on the C674x DSP called from the Cortex A8 takes 1.4ms (This benchmark includes IPC, cache and address translation overheads.)

    ARM : 600Mhz, DSP: 500Mhz.

    All data in external memory with cache enabled (l1DMode:"32k",   l1PMode:"32k",   l2Mode:"128k",)

    DSP side FFT code can be obtained from C674x DSPLIB that can be found here:

    http://www.ti.com/tool/sprc265

    DSP only benchmarks of this function without the IPC overheads can be obtained in the library documentation.

    Regards,

    Rahul