Subversion Repositories complex-gaussian-pseudo-random-number-generator

--/////////////////////////MAGIC BLOCK///////////////////////////////

--Purpose: to produce the equivalent funtionality of following C code

--                              #define MAGIC(y) (((y)&0x1) ? 0x9908b0dfUL : 0)

--Created by: Minzhen Ren

--Last Modified by: Minzhen Ren

--Last Modified Date: Auguest 28, 2010

--Lately Updates: 

--/////////////////////////////////////////////////////////////////

library ieee;

        use ieee.std_logic_1164.all;

        use ieee.std_logic_unsigned.all;

        use ieee.numeric_std.all;

        use ieee.math_real.all;

entity MAGIC is

        generic(

                DATA_WIDTH : Natural := 32

        );

        port(

                Y_IN  : in  std_logic_vector( DATA_WIDTH-1 downto 0 );

                Y_OUT : out std_logic_vector( DATA_WIDTH-1 downto 0 )

        );

end MAGIC;

architecture BEHAVE of MAGIC is

        begin

        WHOLE : process(Y_IN)

        begin

                if (Y_IN(0) and '1') = '1' then

                        Y_OUT <= "10011001000010001011000011011111"; -- 0x9908b0dfUL

                else

                        Y_OUT <= ( others => '0' );

                end if;

        end process;

end BEHAVE;