?? cfft.vhd
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------------------------------------------------------------------------------------------------------- Title : cfft-- Design : cfft-- Author : ZHAO Ming-- email : sradio@opencores.org--------------------------------------------------------------------------------------------------------- File : cfft.vhd-- Generated : Thu Oct 3 03:03:58 2002--------------------------------------------------------------------------------------------------------- Description : radix 4 1024 point FFT input 12 bit Output 14 bit with -- limit and overfall processing internal---- The gain is 0.0287 for FFT and 29.4 for IFFT---- The output is 4-based reversed ordered, it means-- a0a1a2a3a4a5a6a7a8a9 => a8a9a6a7a4a5aa2a3a0a1-- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ port :-- clk : main clk -- I have test 90M with Xilinx virtex600E-- rst : globe reset -- '1' for reset-- start : start fft -- one clock '1' before data input-- invert : '0' for fft and '1' for ifft, it is sampled when start is '1' -- Iin,Qin : data input-- following start immediately, input data-- -- power should not be too big-- inputbusy : if it change to '0' then next fft is enable-- outdataen : when it is '1', the valid data is output-- Iout,Qout : fft data output when outdataen is '1' --------------------------------------------------------------------------------------------------------- Revisions : 0-- Revision Number : 1-- Version : 1.1.0-- Date : Oct 17 2002-- Modifier : ZHAO Ming -- Desccription : Data width configurable --------------------------------------------------------------------------------------------------------- Revisions : 0-- Revision Number : 2-- Version : 1.2.0-- Date : Oct 18 2002-- Modifier : ZHAO Ming -- Desccription : Point configurable-- FFT Gain IFFT GAIN-- 256 0.0698 17.9-- 1024 0.0287 29.4-- 4096 0.0118 48.2742-- --------------------------------------------------------------------------------------------------------- Revisions : 0-- Revision Number : 3-- Version : 1.3.0-- Date : Nov 19 2002-- Modifier : ZHAO Ming -- Desccription : add output data position indication -- ----------------------------------------------------------------------------------------------------- library IEEE; use IEEE.STD_LOGIC_1164.all; use IEEE.STD_LOGIC_ARITH.all; use IEEE.STD_LOGIC_UNSIGNED.all; entity cfft is generic ( Tx_nRx : natural :=1; -- tx = 1, rx = 0 WIDTH : natural := 12; POINT : natural := 64; STAGE : natural := 3 -- STAGE=log4(POINT) ); port( rst : in std_logic; Iin : in std_logic_vector(WIDTH-1 downto 0); Qin : in std_logic_vector(WIDTH-1 downto 0); Iout : out std_logic_vector(WIDTH+1 downto 0); Qout : out std_logic_vector(WIDTH+1 downto 0); factorstart : in std_logic; cfft4start : in std_logic; ClkIn : in std_logic; sel_mux : in std_logic; inv : in std_logic; wen_in : in std_logic; addrin_in : in std_logic_vector(2*stage-Tx_nRx downto 0); addrout_in : in std_logic_vector(2*stage-Tx_nRx downto 0); wen_proc : in std_logic; addrin_proc : in std_logic_vector(2*stage-1 downto 0); addrout_proc : in std_logic_vector(2*stage-1 downto 0); wen_out : in std_logic; addrin_out : in std_logic_vector(2*stage-1 downto 0); addrout_out : in std_logic_vector(2*stage-1 downto 0)); end cfft; architecture cfft of cfft is component mux generic ( width : natural); port ( inRa : in std_logic_vector(WIDTH-1 downto 0); inIa : in std_logic_vector(WIDTH-1 downto 0); inRb : in std_logic_vector(WIDTH-1 downto 0); inIb : in std_logic_vector(WIDTH-1 downto 0); outR : out std_logic_vector(WIDTH-1 downto 0); outI : out std_logic_vector(WIDTH-1 downto 0); clk : in std_logic; sel : in std_logic); end component; component conj generic ( width : natural); port ( inR : in std_logic_vector(WIDTH-1 downto 0); inI : in std_logic_vector(WIDTH-1 downto 0); outR : out std_logic_vector(WIDTH-1 downto 0); outI : out std_logic_vector(WIDTH-1 downto 0); clk : in std_logic; conj : in std_logic); end component; component ram generic ( width : natural; depth : natural; Addr_width : natural); port ( clkin : in std_logic; wen : in std_logic; addrin : in std_logic_vector(Addr_width-1 downto 0); dinR : in std_logic_vector(width-1 downto 0); dinI : in std_logic_vector(width-1 downto 0); clkout : in std_logic; addrout : in std_logic_vector(Addr_width-1 downto 0); doutR : out std_logic_vector(width-1 downto 0); doutI : out std_logic_vector(width-1 downto 0)); end component; component cfft4 generic ( width : natural ); port( clk : in std_logic; rst : in std_logic; start : in std_logic; invert : in std_logic; I : in std_logic_vector(WIDTH-1 downto 0); Q : in std_logic_vector(WIDTH-1 downto 0); Iout : out std_logic_vector(WIDTH+1 downto 0); Qout : out std_logic_vector(WIDTH+1 downto 0) ); end component; component div4limit generic ( WIDTH : natural ); port( clk : in std_logic; D : in std_logic_vector(WIDTH+3 downto 0); Q : out std_logic_vector(WIDTH-1 downto 0) ); end component; component mulfactor generic ( WIDTH : natural; STAGE : natural ); port( clk : in std_logic; rst : in std_logic; angle : in signed(2*STAGE-1 downto 0); I : in signed(WIDTH+1 downto 0); Q : in signed(WIDTH+1 downto 0); Iout : out signed(WIDTH+3 downto 0); Qout : out signed(WIDTH+3 downto 0) ); end component; component rofactor generic ( POINT : natural; STAGE : natural ); port( clk : in std_logic; rst : in std_logic; start : in std_logic; invert : in std_logic; angle : out std_logic_vector(2*STAGE-1 downto 0) ); end component; component blockdram generic ( depth : natural; Dwidth : natural; Awidth : natural); port ( clkin : in std_logic; wen : in std_logic; addrin : in std_logic_vector(Awidth-1 downto 0); din : in std_logic_vector(Dwidth-1 downto 0); clkout : in std_logic; addrout : in std_logic_vector(Awidth-1 downto 0); dout : out std_logic_vector(Dwidth-1 downto 0)); end component; signal MuxInRa, MuxInIa, MuxInRb, MuxInIb : std_logic_vector(WIDTH-1 downto 0) := (others => '0'); signal conjInR, conjInI : std_logic_vector(WIDTH-1 downto 0) := (others => '0'); signal cfft4InR, cfft4InI : std_logic_vector(WIDTH-1 downto 0) := (others => '0'); signal cfft4outR, cfft4outI : std_logic_vector(WIDTH+1 downto 0) := (others => '0'); signal MulOutR, MulOutI : signed(WIDTH+3 downto 0) := (others => '0'); signal fftR, fftI : std_logic_vector(WIDTH-1 downto 0) := (others => '0'); signal angle : std_logic_vector(2*STAGE-1 downto 0 ) := ( others => '0'); signal invert : std_logic; beginTX:if Tx_nRx = 1 generate RamIn : ram generic map ( width => WIDTH, depth => POINT, Addr_width => 2*STAGE) port map ( clkin => ClkIn, wen => wen_in, addrin => addrin_in, dinR => Iin, dinI => Qin, clkout => ClkIn, addrout => addrout_in, doutR => MuxInRa, doutI => MuxInIa); RamOut : ram generic map ( width => WIDTH+2, depth => POINT, Addr_width => 2*STAGE) port map ( clkin => ClkIn, wen => wen_out, addrin => addrin_out, dinR => cfft4outR, dinI => cfft4outR, clkout => ClkIn, addrout => addrout_out, doutR => Iout, doutI => open);end generate;RX:if Tx_nRx = 0 generate RamIn : ram generic map ( width => WIDTH, depth => 2*POINT, Addr_width => 2*STAGE+1) port map ( clkin => ClkIn, wen => wen_in, addrin => addrin_in, dinR => Iin, dinI => Qin, clkout => ClkIn, addrout => addrout_in, doutR => MuxInRa, doutI => open); MuxinIa <= (others => '0'); RamOut : ram generic map ( width => WIDTH+2, depth => POINT, Addr_width => 2*STAGE) port map ( clkin => ClkIn, wen => wen_out, addrin => addrin_out, dinR => cfft4outR, dinI => cfft4outR, clkout => ClkIn, addrout => addrout_out, doutR => Iout, doutI => Qout);end generate; RamProc : ram generic map ( width => WIDTH, depth => POINT, Addr_width => 2*STAGE) port map ( clkin => ClkIn, wen => wen_proc, addrin => addrin_proc, dinR => fftR, dinI => fftI, clkout => ClkIn, addrout => addrout_proc, doutR => MuxInRb, doutI => MuxInIb); mux_1 : mux generic map ( width => width) port map ( inRa => MuxInRa, inIa => MuxInIa, inRb => MuxInRb, inIb => MuxInIb, outR => conjInR, outI => conjInI, clk => clkin, sel => sel_mux);invert <= (inv and conv_std_logic_vector(Tx_nRx,1)(0)); conj_1: conj generic map ( width => width) port map ( inR => conjInR, inI => conjInI, outR => cfft4InR, outI => cfft4InI, clk => Clkin, conj => invert); acfft4 : cfft4 generic map ( WIDTH => WIDTH ) port map ( clk => ClkIn, rst => rst, start => cfft4start, invert => conv_std_logic_vector(Tx_nRx,1)(0), I => cfft4InR, Q => cfft4InI, Iout => cfft4outR, Qout => cfft4outI ); amulfactor : mulfactor generic map ( WIDTH => WIDTH, STAGE => STAGE ) port map ( clk => ClkIn, rst => rst, angle => signed(angle), I => signed(cfft4outR), Q => signed(cfft4outI), Iout => MulOutR, Qout => MulOutI ); arofactor : rofactor generic map ( POINT => POINT, STAGE => STAGE ) port map ( clk => ClkIn, rst => rst, start => factorstart, invert => conv_std_logic_vector(Tx_nRx,1)(0), -- IFFT angle => angle ); Rlimit : div4limit generic map ( WIDTH => WIDTH ) port map ( clk => ClkIn, D => std_logic_vector(MulOutR), Q => fftR ); Ilimit : div4limit generic map ( WIDTH => WIDTH ) port map ( clk => ClkIn, D => std_logic_vector(MulOutI), Q => fftI ); end cfft;?? 快捷鍵說(shuō)明
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