The 0.00015 control input 0.00020 signal "start" was one clock cycle at a high-level, at the end of which, "rfd" will go the high level, indicating that the FFTIt mcaondbuelseewenafsroremadTyabtloe 3retcheaitvtehedtaitma.e-Tdhifefexrenn_creeiannfodrmxnat_iiomn gsievqeunebnycethsew...