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FFT accelerator performance

Question asked by ChristianH on Jul 11, 2016
Latest reply on Jul 21, 2016 by ChristianH

Hi,

 

I can't see my possible error so I'm asking it here.

 

I've used the 256pointFFT example on the ADSP-21469 EZ-Board.

Running on 450MHz the calcuation time is around 21µs (measured with GPIO changing before and after the accelerator DMA operations).

 

But according to the ADSP-214xx_hwr_rev1.1.pdf the time should be:

2*256*2 + 256*log2(256) + 2*256 = 3584 cclk which is around 8µs.

 

Where is my error?

 

Regards

Christian

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