module FFT(clk,reset,sink_valid,sink_sop,sink_eop,fifo_full,Realdata_in,Imagdata_in, 
ar_out, ai_out, br_out, bi_out,source_valid);

input clk,reset,sink_valid,sink_sop,sink_eop,fifo_full;
input[15:0] Realdata_in,Imagdata_in;
output source_valid;
output[17:0] ar_out,ai_out,br_out,bi_out;

