Why FFT HDL Optimized has not output?

I copied hdlcoderfftdit.slx from hdl coder examples coming with 2021a. Based on instruction replaced the HDL FFT model in the Simulink model by FFT HDL Optimized model, and set it to Burst Radix 2 (see attached .slx). There is not output from FFT HDL Optimized model.

Anybody can help me?

Thanks

Chen

Answer 1

[Bharath Venkataraman]

It looks like the input valid is not being set to the right pulse width to feed in all the input data for a given frame. Please set the pulse width on the pulse generator to N (instead of N/2). This results in output from the FFT.