wan_xiaoshi.vhd

来自「此为一用VHDL编写的硬件游戏程序」· VHDL 代码 · 共 61 行

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity wan_xiaoshi is
port(inf  :in std_logic_vector(15 downto 0);
     sel  :in std_logic_vector(3 downto 0);
     infoout : out std_logic_vector(15 downto 0));
end wan_xiaoshi;
architecture behave of wan_xiaoshi is
begin
  process(sel)
  begin
   case sel is
    when "0000"=>infoout(15 downto 4)<=inf(15 downto 4);
                 infoout(3 downto 0)<="0000";
    when"0001"=>infoout(15 downto 5)<=inf(15 downto 5);
                infoout(4 downto 1)<="0000";
                 infoout(0)<=inf(0);
    when "0010"=>infoout(15 downto 6)<=inf(15 downto 6);
                 infoout(5 downto 2)<="0000";
                  infoout(1 downto 0)<=inf(1 downto 0);
    when "0011"=>infoout(15 downto 7)<=inf(15 downto 7);
                infoout(6 downto 3)<="0000";
                 infoout(2 downto 0)<=inf(2 downto 0);
   when "0100"=>infoout(15 downto 8)<=inf(15 downto 8);
                 infoout(7 downto 4)<="0000";
                 infoout(3 downto 0)<=inf(3 downto 0); 
   when "0101"=>infoout(15 downto 9)<=inf(15 downto 9);
                infoout(8 downto 5)<="0000";
                 infoout(4 downto 0)<=inf(4 downto 0); 
   when "0110"=>infoout(15 downto 10)<=inf(15 downto 10);
                 infoout(9 downto 6)<="0000";
                 infoout(5 downto 0)<=inf(5 downto 0);  
   when "0111"=>infoout(15 downto 11)<=inf(15 downto 11);
                 infoout(10 downto 7)<="0000";
                 infoout(6 downto 0)<=inf(6 downto 0); 
   when "1000"=>infoout(15 downto 12)<=inf(15 downto 12);
                 infoout(11 downto 8)<="0000";
                 infoout(7 downto 0)<=inf(7 downto 0); 
   when "1001"=>infoout(15 downto 13)<=inf(15 downto 13);
                 infoout(12 downto 9)<="0000";
                 infoout(8 downto 0)<=inf(8 downto 0);
   when "1010"=>infoout(15 downto 14)<=inf(15 downto 14);
                 infoout(13 downto 10)<="0000";
                 infoout(9 downto 0)<=inf(9 downto 0);
   when "1011"=>infoout(15)<=inf(15);
                 infoout(14 downto 11)<="0000";
                infoout(10 downto 0)<=inf(10 downto 0);
   when "1100"=>infoout(15 downto 12)<="0000";
                 infoout(11 downto 0)<=inf(11 downto 0);
   when "1101"=>infoout(15 downto 13)<="000";
                infoout(12 downto 0)<=inf(12 downto 0);
  when "1110"=>infoout(15 downto 14)<="00";
                 infoout(13 downto 0)<=inf(13 downto 0);
   when "1111"=>infoout(15)<='0';
                 infoout(14 downto 0)<=inf(14 downto 0);
   when others=>infoout(15 downto 0)<=inf(15 downto 0);
end case;
end process;
end behave;