decl7s.vhd

四位二进制计数器与半加器

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 DECL7S;
ARCHITECTURE ONE OF DECL7S IS
BEGIN
 PROCESS(A)
 BEGIN
 CASE A(3 DOWNTO 0) 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 "1010" => LED7S <="1110111";
 WHEN "1011" => LED7S <="1111100";
 WHEN "1100" => LED7S <="0111001";
 WHEN "1101" => LED7S <="1011110";
 WHEN "1110" => LED7S <="1111001";
 WHEN "1111" => LED7S <="1110001";
 WHEN OTHERS => NULL;
 END CASE;
 END PROCESS;
END ONE;