shiftreg1.vhd

来自「an implementation of fft 1024 with cos a」· VHDL 代码 · 共 44 行

-- hds header_start 
--1 stage shift register, data_width bits wide. 
 
LIBRARY ieee; 
USE ieee.std_logic_1164.ALL; 
USE ieee.std_logic_arith.ALL; 
 
 
ENTITY shiftreg1 IS 
   GENERIC(  
    data_width : integer := 25 
   ); 
 PORT(    
      clock      : IN     std_logic; 
      read_data  : OUT    std_logic_vector (data_width-1 DOWNTO 0); 
      write_data : IN     std_logic_vector (data_width-1 DOWNTO 0); 
      resetn     : IN     std_logic 
   ); 
 
-- Declarations 
 
END shiftreg1 ; 
-- hds interface_end 
ARCHITECTURE behavior OF shiftreg1 IS 
--signal reg00 : std_logic_vector(data_width-1 downto 0); 
beGIN
process(Clock) 
begin
  if (Clock'event and Clock='1') then 
       if (resetn='0') then   
--      for i in data_width-1 downto 0 loop 
--        reg00(i)<='0'; 
        read_data <= (others => '0');      
--end loop;      --
else    
--    reg00<=write_data; --
--      read_data<=reg00; 
     read_data  <=  write_data;           
   
  end if; 
 end if; 
end process; 
END behavior;