decl7s.vhd

来自「一个简单的交通灯程序(包括验证,主程序,和译码程序),在ALTER DE2板上实」· VHDL 代码 · 共 25 行

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY DECL7S IS
  PORT (A :IN STD_LOGIC_VECTOR(3 DOWNTO 0);
        LED7S : OUT STD_LOGIC_VECTOR(6 DOWNTO 0));
END;
ARCHITECTURE ONE OF DECL7S IS
BEGIN
 PROCESS(A)
 BEGIN
 CASE A IS
   WHEN "0000" => LED7S <="0111111";
   WHEN "0001" => LED7S <="0000110";
   WHEN "0010" => LED7S <="1011011";
   WHEN "0011" => LED7S <="1001111";
   WHEN "0100" => LED7S <="1100110";
   WHEN "0101" => LED7S <="1101101";
   WHEN "0110" => LED7S <="1111101";
   WHEN "0111" => LED7S <="0000111";
   WHEN "1000" => LED7S <="1111111";
   WHEN "1001" => LED7S <="1101111";
when others => null;
end  case;
end process;
end;