ex_p4_15_enb_decoder.vhd

来自「This is the course for VHDL programming」· VHDL 代码 · 共 21 行

library IEEE;
use IEEE.std_logic_1164.all;
entity ENB_DECODE is
port(ADR : in  STD_LOGIC_VECTOR(2 downto 0);
     EN : in std_logic;
	  Y: out STD_LOGIC_VECTOR (7 downto 0));
end ENB_DECODE;
Architecture DF of ENB_DECODE is
Begin
	
	Y<="00000000" when EN = '0'  else	
	   "00000001" when ADR="000" else
		"00000010" when ADR="001" else
		"00000100" when ADR="010" else
		"00001000" when ADR="011" else
		"00010000" when ADR="100" else
		"00100000" when ADR="101" else
		"01000000" when ADR="110" else
		"10000000" when ADR="111" else
		"XXXXXXXX" ;
End DF;