mux4.vhd

来自「vhdl code for GIF Image Viewer」· VHDL 代码 · 共 26 行

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity mux4 is
	 Generic ( size : integer := 8 );
    Port ( d0 : in std_logic_vector(size-1 downto 0);
           d1 : in std_logic_vector(size-1 downto 0);
			  d2 : in std_logic_vector(size-1 downto 0);
			  d3 : in std_logic_vector(size-1 downto 0);
           s : in std_logic_vector(1 downto 0);
           o : out std_logic_vector(size-1 downto 0));
end mux4;

architecture Behavioral of mux4 is
begin	
PROCESS (s, d0, d1, d2, d3)
begin
IF (s = "00") THEN o <= d0;
ELSIF (s = "01") THEN o <= d1;
ELSIF (s = "10") THEN o <= d2; 
ELSE o <= d3; END IF;
END PROCESS;
end Behavioral;