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 "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 ;
为什么这个程序和楼上那个程序显示译码完全不同