FSM problem

It seems that the state machine is only half recognised by the FSM viewer. It can list the states but not the transitions. I'm not sure, but you may have to stick to the two-process model that Altera describes in the guidelines for the state machine to be properly recognized by the viewer.

The purspose of this process with a single constant assignment isn't well understandable, but because xy_reg is also assigned in the process FSM1, it's causing a "multiple driver" error. If you feel a need for multiple concurrent assignments to xy_reg, they have to be placed inside FSM1. For the general rules for signal assignments, consult a VHDL text book or tutorial.

Game: process (clk)
  begin
    if clk'event and clk = '1' then
      xy_reg(1,1) <= '1';^
    end if;
  end process Game;

and it is still unsolved so your ideas will be very helpful.

thanks anyway bro.

Wish I could help you brother

Sorry for late reply and thank you for your replies. After some tests I found problem and rewrite the code but this time I got some errors.

type XY_REG_TYPE is array (0 to 19,0 to 9) of std_logic;
	type AB_REG_TYPE is array (0 to 3,0 to 3) of std_logic;
	type XY_NEXT_TYPE is array (0 to 19,0 to 9) of std_logic;
	type AB_NEXT_TYPE is array (0 to 3,0 to 3) of std_logic;	
	type STATE_TYPE is (count,zero,left,down,right);
	signal m : integer range 0 to 9;
	signal n : integer range 0 to 19;
	signal c,d : integer range 0 to 3;
	signal ab_reg : AB_REG_TYPE;
	signal xy_reg : XY_REG_TYPE;
	signal ab_next : AB_NEXT_TYPE;
	signal xy_next : XY_NEXT_TYPE;
	signal state_reg, state_next : STATE_TYPE;
	signal T_reg, T_next : integer range 0 to 10; 
	begin
        TimeDelay : process (clk)
		variable cnt : integer range 0 to 10 := 0; 
		begin
			if clk'event and clk = '1' then
				if	EndOfField = '1' then
					if cnt = 10 then
						Delay <= '1';
						cnt := 0;
					else
						Delay <= '0';
						cnt := cnt + 1;
					end if;
				end if;
			end if;
		end process TimeDelay;
		
		FSM1 : process (clk, reset)
		begin
			if reset = '1' then
				state_reg <= count;
			elsif clk'event and clk = '1' then
				for n in 0 to 19 loop
					for m in 0 to 9 loop
						if xy_reg(n,m) = '1' then
							state_reg <= state_next;
							xy_reg(n,m) <= xy_next(n,m);
						end if;
					end loop;
				end loop;
			end if;
		end process FSM1;
		
		FSM2 : process (SW(1), BUTTON, Delay, xy_reg(n,m), state_reg)	
		begin
			for n in 0 to 19 loop
				for m in 0 to 9 loop
					if xy_reg(n,m) = '1' then
						state_next <= state_reg;
						xy_next(n,m) <= xy_reg(n,m);
							
						case state_reg is
						when count =>
							if Delay = '1' and SW(1) = '1' then
								state_next <= zero;
							else
								state_next <= count;
							end if;
						when zero =>
							if BUTTON = "111" then
								if n <= 18 then
									if xy_reg(n+1,m) = '0' then
										xy_next(n+1,m) <= xy_reg(n,m);
										state_next <= count;
									else
										xy_next(n,m) <= xy_reg(n,m);
										state_next <= count;
									end if;
								end if;
							elsif BUTTON = "101" then
								state_next <= down;
							elsif BUTTON = "110" then
								state_next <= right;
							elsif BUTTON = "011" then
								state_next <= left;
							end if;
						when down =>
							if n <= 18 then
								if xy_reg(n+1,m) = '0' then
									xy_next(n+1,m) <= xy_reg(n,m);
									state_next <= count;
								else
									xy_next(n,m) <= xy_reg(n,m);
									state_next <= count;
								end if;
							end if;	
						when right =>
							if m <= 8 then
								if xy_reg(n,m+1) = '0' then
									xy_next(n,m+1) <= xy_reg(n,m);
									state_next <= count;
								else
									xy_next(n,m) <= xy_reg(n,m);
									state_next <= count;
								end if;
							end if;
						when left =>
							if m >= 1 and n <= 18 then
								if xy_reg(n,m-1) = '0' then
									xy_next(n,m-1) <= xy_reg(n,m);
									state_next <= count;
								else
									xy_next(n,m) <= xy_reg(n,m);
									state_next <= count;
								end if;
							end if;
						end case;
					end if;
				end loop;
			end loop;
		end process FSM2;
		Game: process (clk)
		begin
			if clk'event and clk = '1' then
				xy_reg(1,1) <= '1';
			end if;
		end process Game;

Thanks a lot for the information; as I stated in my post, the information I reported might be constrained to "old style" by job practice.

This reminds me of an interview question when the man in power asked me why I used integer for my counters, and that I should have used unsigned. I firmly replied that constrained integers, or signed or unsigned or std_logic eventually are translated by compiler to buses. We either trust the tools or give up.

Gabrigob - very outdated views indeed. I suppose you only use std_logic(_vector) for ports too?

type silly_array_t is array ('A' to 'G') of integer;
signal mux : silly_array_t;
...
entity silly is
  port ( 
    char : in character range 'A' to 'G';
    );
architecture....
output <= input(char);