FFT IP Core: User Guide

ID 683374
Date 11/06/2017
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3.4.2.2. Changing Direction

To change direction on a block-by-block basis:
Assert or deassert inverse (appropriately) simultaneously with the application of the sink_sop pulse (concurrent with the first input data sample of the block).

When the FFT completes the transform of the input block, it asserts source_valid and outputs the complex transform domain data block. The FFT function asserts the source_sop to indicate the first output sample. The order of the output data depends on the output order that you select in IP Toolbench. The output of the FFT may be in natural order order.