dec2_4_c.vhd

来自「VHDL子程序集,包括各种例程资料以及源码.」· VHDL 代码 · 共 32 行

--*********************************
--*  2 To 4 Decoder (CASE .. IS)  *
--*     Filename : DEC2_4_C       * 
--*********************************

library IEEE;
use IEEE.std_logic_1164.all;

entity DEC2_4_C is
    port (
          A: in STD_LOGIC_VECTOR (1 downto 0);
          Y: out STD_LOGIC_VECTOR (0 to 3)
         );
end DEC2_4_C;

architecture DEC2_4_C_arch of DEC2_4_C is

begin
process (A)

begin 
    case A is
       when "00"   => Y <= "0111";
       when "01"   => Y <= "1011";
       when "10"   => Y <= "1101";
       when "11"   => Y <= "1110";
       when others => Y <= "1111";
    end case;  
end process;
     
end DEC2_4_C_arch;