score.vhd

用VHDL开发的棒球游戏

library ieee;
use ieee.std_logic_1164.all;

entity score is
	port (clk,base1,base2,base3,hit1,hit2,hit3,hit4,resetn: in std_logic;
              add_to_score1,add_to_score2,add_to_score3,add_to_score4 : out std_logic);
end;

architecture behavior of score is
	type type_sreg is (add1,add2,add3,add4,idle);
	signal sreg, next_sreg : type_sreg;
	signal next_add_to_score1,next_add_to_score2,next_add_to_score3,
		next_add_to_score4 : std_logic;
begin
  process (clk, resetn)
  begin
    if resetn='0' then
      sreg <= idle;
      add_to_score1 <= '0';
      add_to_score2 <= '0';
      add_to_score3 <= '0';
      add_to_score4 <= '0';
    elsif clk='1' and clk'event then
      sreg <= next_sreg;
      add_to_score1 <= next_add_to_score1;
      add_to_score2 <= next_add_to_score2;
      add_to_score3 <= next_add_to_score3;
      add_to_score4 <= next_add_to_score4;
    end if;
  end process;

  process (sreg,base1,base2,base3,hit1,hit2,hit3,hit4)
  begin
    case sreg is
      when add1 =>
        next_sreg<=idle;
        next_add_to_score1<='0';
        next_add_to_score2<='0';
        next_add_to_score3<='0';
        next_add_to_score4<='0';
      when add2 =>
        next_sreg<=idle;
        next_add_to_score1<='0';
        next_add_to_score2<='0';
        next_add_to_score3<='0';
        next_add_to_score4<='0';
      when add3 =>
        next_sreg<=idle;
        next_add_to_score1<='0';
        next_add_to_score2<='0';
        next_add_to_score3<='0';
        next_add_to_score4<='0';
      when add4 =>
        next_sreg<=idle;
        next_add_to_score1<='0';
        next_add_to_score2<='0';
        next_add_to_score3<='0';
        next_add_to_score4<='0';
      when idle =>
        if  (((base1='0') and (base2='0') and (base3='0') and (hit4='1')) or
             ((base1='1') and (base2='0') and (base3='0') and (hit3='1')) or
             ((base1='0') and (base2='1') and (base3='0') and  ((hit2='1') or ( hit3='1' ))) or
             ((base1='0') and (base2='0') and (base3='1') and  ((hit1='1') or ( hit2='1' ) or ( hit3='1' ))) or
             ((base1='1') and (base2='1') and (base3='0') and (hit2='1')) or
             ((base1='1') and (base2='0') and (base3='1') and  ((hit1='1') or (hit2='1'))) or
             ((base1='0') and (base2='1') and (base3='1') and (hit1='1')) or
             ((base1='1') and (base2='1') and (base3='1') and (hit1='1'))) then
          next_sreg<=add1;
          next_add_to_score2<='0';
          next_add_to_score3<='0';
          next_add_to_score4<='0';
          next_add_to_score1<='1';
        elsif  (((base1='1') and (base2='0') and (base3='0') and (hit4='1')) or
                ((base1='0') and ( base2='1' ) and ( base3='0' ) and (hit4='1')) or
                ((base1='0') and ( base2='0' ) and ( base3='1' ) and (hit4='1')) or
                (( base1='1' ) and ( base2='1' ) and ( base3='0' ) and (hit3='1')) or
                (( base1='1' ) and ( base2='0' ) and ( base3='1' ) and (hit3='1')) or
                (( base1='0' ) and ( base2='1' ) and ( base3='1' ) and (hit3='1')) or
                (( base1='0' ) and ( base2='1' ) and ( base3='1' ) and (hit2='1')) or
                (( base1='1' ) and ( base2='1' ) and ( base3='1' ) and (hit2='1'))) then
          next_sreg<=add2;
          next_add_to_score1<='0';
          next_add_to_score3<='0';
          next_add_to_score4<='0';
          next_add_to_score2<='1';
        elsif  (((base1='1') and (base2='1') and (base3='0') and (hit4='1')) or
                ((base1='1') and (base2='0') and (base3='1') and (hit4='1')) or
                (( base1='0') and (base2='1') and (base3='1') and (hit4='1')) or
                ((base1='1') and (base2='1') and (base3='1') and (hit3='1'))) then
          next_sreg<=add3;
          next_add_to_score1<='0';
          next_add_to_score2<='0';
          next_add_to_score4<='0';
          next_add_to_score3<='1';
        elsif  ((base1='1') and (base2='1') and (base3='1') and (hit4='1')) then
          next_sreg<=add4;
          next_add_to_score1<='0';
          next_add_to_score2<='0';
          next_add_to_score3<='0';
          next_add_to_score4<='1';
        else
          next_sreg<=idle;
          next_add_to_score1<='0';
          next_add_to_score2<='0';
          next_add_to_score3<='0';
          next_add_to_score4<='0';
        end if;
      when others => null;
    end case;
  end process;
end behavior;