yimaqi.txt

来自「最简便的交通灯控制源代码 适合VHDL初学者 十字路口红绿灯控制」· 文本 代码 · 共 28 行

library ieee;
use ieee.std_logic_1164.all;

entity yimaqi is
  port(D :in std_logic_vector(3 downto 0);
       Q :out std_logic_vector(6 downto 0));
end;

architecture a of yimaqi is
begin 
  process(d)
  begin
    case D is
       when "0000"=>q<="1111110";
       when "0001"=>q<="0110000";
       when "0010"=>q<="1101101";
       when "0011"=>q<="1111001";
       when "0100"=>q<="0110011";
       when "0101"=>q<="1011011";
       when "0110"=>q<="1011111";
       when "0111"=>q<="1110000";
       when "1000"=>q<="1111111";
       when "1001"=>q<="1111011";
       when others=>q<="1111110";
   end case;
 end process;
end;