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nixiebunny
Contributor
Contributor
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Registered: ‎01-26-2009

Vector FFT documentation regarding frames

I'm trying to understand how to use the Vector FFT that System Generator DSP creates.

I am using it in pipelined streaming mode, fixed length. I would like to stream data continuously through the FFT with no dropped words, but that's not absolutely necessary.

The Vector FFT block has tvalid and tready inputs and outputs. However, there is no reset signal, no start signal, no tlast signal, no output index, nothing at all to provide a clue to the frame start point. (The Fast Fourier transform IP Core 9.1 has these features, so it's a bit easier to use.)

How is a user supposed to synchronize the FFT frames of a Vector FFT?

 

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arashr
Explorer
Explorer
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Registered: ‎02-06-2018

Hi

I have the same question, in a regular FFT, it provides start_frame_in and start_frame_out pins:

FFT.pngBut for the SSR FFT there is no control pins:

VFFT.png

So my question is, how to make sure the SST FFT is synchronized and how to control/monitor the frame's start and stop states?

 

 

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