fft source, and we can hope that the exchanges

fft16ref_v1_0
.............\readme.html
.............\README1ST.txt
.............\xfft16ngo
.............\.........\COSS16.ngo
.............\.........\fftwrap.vhd
.............\.........\MULXX.ngo
.............\.........\MUX21W16.ngo
.............\.........\MUX2W4.ngo
.............\.........\MUX4W16.ngo
.............\.........\RADD16.ngo
.............\.........\RAMD1616.ngo
.............\.........\README_fft16-ngo.doc
.............\.........\REG16.ngo
.............\.........\REG4.ngo
.............\.........\RESULT.ngo
.............\.........\RSUB16.ngo
.............\.........\SINN16.ngo
.............\.........\TCOMPW16.ngo
.............\.........\TRIGINV.ngo
.............\.........\xfft16.ngo
.............\.........\Z6W16.ngo
.............\xfft16_beh_vhdl
.............\...............\do
.............\...............\..\compile_all.do
.............\...............\..\compile_tb_fio.do
.............\...............\..\comp_sim_run_fio.do
.............\...............\fft16xk.dat
.............\...............\modelsim.ini
.............\...............\r4difv1.exe
.............\...............\readme_beh_VHDL.doc
.............\...............\tb_xfft16_fio.vhd
.............\...............\vhdl
.............\...............\....\bflywj.vhd
.............\...............\....\bitrev_agen.vhd
.............\...............\....\bitrev_dbufr.vhd
.............\...............\....\blyw0.vhd
.............\...............\....\cb2re.vhd
.............\...............\....\cb8re.vhd
.............\...............\....\cmplxadd.vhd
.............\...............\....\cmplxsub16.vhd
.............\...............\....\cmplx_mul16.vhd
.............\...............\....\coss16.vhd
.............\...............\....\dblbufr.vhd
.............\...............\....\dblbufr1.vhd
.............\...............\....\dfly_agen.vhd
.............\...............\....\dual_xlatch16.vhd
.............\...............\....\fd.vhd
.............\...............\....\fdc.vhd
.............\...............\....\fdre.vhd
.............\...............\....\fdre_locx.vhd
.............\...............\....\fdre_locy.vhd
.............\...............\....\fft16.vhd
.............\...............\....\fft256r4.vhd
.............\...............\....\fft4.vhd
.............\...............\....\fft4r.vhd
.............\...............\....\ftrse.vhd
.............\...............\....\mathpack.vhd
.............\...............\....\mulxx.vhd
.............\...............\....\mux21w16.vhd
.............\...............\....\mux2w4.vhd
.............\...............\....\mux2w4r.vhd
.............\...............\....\mux4w16.vhd
.............\...............\....\mux4w8.vhd
.............\...............\....\phases.vhd
.............\...............\....\r4butterfly.vhd
.............\...............\....\r4n256w.vhd
.............\...............\....\radd16.vhd
.............\...............\....\ramd1616.vhd
.............\...............\....\reg16.vhd
.............\...............\....\reg16_pitch2.vhd
.............\...............\....\reg4.vhd
.............\...............\....\reg8.vhd
.............\...............\....\result.vhd
.............\...............\....\rmux4w16.vhd
.............\...............\....\rsub16.vhd
.............\...............\....\sinn16.vhd
.............\...............\....\state_control.vhd
.............\...............\....\tcompw16.vhd
.............\...............\....\triginv.vhd
.............\...............\....\xfft1024_cntrl.vhd
.............\...............\....\xfft16.vhd
.............\...............\....\z17w8.vhd
.............\...............\....\z4_1.vhd
.............\...............\....\z4_1_h.vhd
.............\...............\....\z5w16.vhd
.............\...............\xfft_cmpr.m
.............\...............\xin.dat
.............\...............\xk_cmpr.m
.............\...............\xnoisesig.m

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