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Hi everyone, As part of my job I try to implement a FFT function in my ZedBoard. I found some example including one in the SystemC folder unfortunately not synthesizable. Furthermore, I use a free version of Vivado HLS and this tool is very restrictive (few things are synthesizable). So, I will going to have to code my own version of this function (8k/16k/32k FFT). For doing this, I started by cut the FFT's mathematical formula and try to code a exponential function. I realized I can't use the "math.h" library and then I have to code all with only logic gates. At this level, I prefer to code directly in VHDL. Does anyone have a experience with this synthesis tool and can give me a simpler way to achieve my goal ? Maybe I see the problem of the wrong angle. Best regards