FFT IP Core: User Guide

ID 683374
Date 11/06/2017
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3.4.2.4. Enabling the Variable Streaming FFT

  1. Assert sink_valid.
  2. Transfer valid data to the FFT. The FFT processes data.

FFT Behavior When sink_valid is Deasserted

  1. Deassert sink_valid during a frame to stall the FFT, which then processes no data until you assert sink_valid. Any previous frames that are still in the FFT also stall.
  2. If you deassert sink_valid between frames, the FFT processes and transfers the data currently in the FFT to the output.
  3. Disable the FFT by deasserting the clk_en signal.