mux2_2.vhd

在软件MAX+plus II环境中

--对ROM和RAM的操作进行选择
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY MUX2_2 IS
PORT(
   RM:IN STD_LOGIC;
    IROM,IRAM:IN STD_LOGIC_VECTOR(7 DOWNTO 0);
    M2_2OUT:OUT STD_LOGIC_VECTOR(7 DOWNTO 0)
    );
END MUX2_2;
ARCHITECTURE A OF MUX2_2 IS
BEGIN
  PROCESS(RM,IROM,IRAM)
  BEGIN
    IF(RM='0')THEN
      M2_2OUT<=IROM;
    ELSE
      M2_2OUT<=IRAM;
    END IF;
  END PROCESS;
END A;