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1.3.2. Variable Streaming FFT
The fixed-point representation grows the data widths naturally from input through to output thereby maintaining a high SNR at the output. The single precision floating-point representation allows a large dynamic range of values to be represented while maintaining a high SNR at the output.
The order of the input data vector of size N can be natural or digit-reversed, or -N/2 to N/2 (DC-centered). The fixed-point representation supports a natural or DC-centered order and the floating point representation supports a natural, digit-reversed order. The FFT outputs the transform-domain complex vector in natural or digit-reversed order. You can specify the transform direction on a per-block basis using an input port.