Why does the data sheet mention that the C Model uses the C_CHANNELS generic?
The FFT data sheet incorrectly states that C_CHANNELS is a generic required for the C model.
The FFT v5.0 data sheet, in table 4, page 16, states that C_CHANNELS is a generic required for the C model. This is not true, and is a mistake in the data sheet. C_CHANNELS are not used by the C model. The C model is a single-channel model. All references to C_CHANNELS in the documentation of the C model in the core data sheet can safely be ignored.
Please see (Xilinx Answer 29209) for a detailed list of LogiCORE Fast Fourier Transform (FFT) Release Notes and Known Issues.