newcoder.vhd

来自「我们学校做VHDL实验的源码」· VHDL 代码 · 共 28 行

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY newCODER IS
  PORT(EN: IN STD_LOGIC;
        A:IN STD_LOGIC_VECTOR(6 DOWNTO 0);
        B:OUT STD_LOGIC_VECTOR(2 DOWNTO 0)
      );
END ENTITY;
ARCHITECTURE BHV OF newCODER IS
 BEGIN
  PROCESS(EN,A)
  BEGIN
  IF(EN='1') THEN B<="111";
    ELSIF(A(6)='0') THEN B<="110"; 
    ELSIF(A(5)='0') THEN B<="101";
    ELSIF(A(4)='0') THEN B<="100";
    ELSIF(A(3)='0') THEN B<="011";
    ELSIF(A(2)='0') THEN B<="010";
    ELSIF(A(1)='0') THEN B<="001";
    ELSIF(A(0)='0') THEN B<="000";
    ELSE B<="111";
   END IF;
     
 END PROCESS;
END BHV;