Simple FFT operation

I did fft in 2000 with its very first buggy versions. I had to stream it myself using two cores in a queue so you should not despair.

I am lucky not using it anymore but in general an fft module will need:

clock

reset

real data input

imag data input

data valid (a signal that indicates data to be read into fft if system clock is faster than data or data comes bursty...etc)

start of frame (i.e. your input ha to be split into 1024 segments, each processed anf finished after some given time) indicated by data ready