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How to implement a real-time fft for FPGA with matlab or simulink ?

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I already know that there is a FFT HDL Optimized Block in Simulink that can be used to generate HDL Code for later on FPGA implementation.
But does this block calculate the FFT real-time ? If not, how do i implement it ? and if yes, how do i configure its attributes (FFTLength, etc.) ?

Accepted Answer

Bharath Venkataraman
Bharath Venkataraman on 13 Aug 2021
The HDL code from the FFT HDL Optimized does do processing in real-time with streaming samples. It also allows you to process multiple samples every clock to increase your throughput to Gigasamples per second. You can set the parameters on the mask of the block and the number of samples you feed in to the block decides how many samples it processes on the FPGA.
Bharath Venkataraman
Bharath Venkataraman on 15 Aug 2021
For an FFT length of 8, the blocks will take elements in 1,2,4, or 8 at a time (you decided this in your model), and then give you the FFT output for every 8-samples of input. After the 8th sample, you go to sample 1 of the next frame and so on. Turn on start and end of frame signals on the output to see the behavior.

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