k4mux.vhd

里面有一个很实用的源码,数字引爆密码设计

LIBRARY IEEE;
USE IEEE.std_logic_1164.ALL;

ENTITY k4mux IS
           PORT (A,B      : IN  std_logic;
                 C,D,E,F  : OUT  std_logic);
END k4mux;

ARCHITECTURE k4mux_arc OF k4mux IS
BEGIN
     PROCESS(A,B)
     BEGIN
          IF (A = '0' AND B = '0') THEN
             C <= '0';  D <= '0';  E <= '1';  F<= '0';
          ELSIF (A = '1' AND B = '0') THEN
             C <= '1';  D <= '0';  E <= '0';  F<= '0';
          ELSIF (A = '0' AND B = '1') THEN
             C <= '1';  D <= '0';  E <= '0';  F<= '0';
          ELSE
             C <= '1';  D <= '1';  E <= '1';  F<= '1';
          END IF;
     END PROCESS;
END k4mux_arc;