Quartus not producing logic question

K

kipman725

Guest
Hello I'm trying to make a pong game I made the following module, it
takes input from counters that increment to 766 in the x direction
then reset and increment one in the y untill y reaches 512. There is
another module generating Horizontal and vertical sync from this.
This particular module is ment to be generating x and y position
counters for the 640*480 play area and also an output that is high
when the current position in the frame is in the play area, thereby
simplifying the actual game logic. The problem is that I get
"Warning: Following 20 pins have nothing, GND, or VCC driving datain
port" and no logic is produced for this module. It acts like the x
and y position counters for the frame can never meet the conditions of
the if statments!?!?!
My code is probobly horible I am self taught and quite inexperianced.
I am using quartus 8.1 to compile this:

--Game Position Counters
--640*480 Pix play feild
library ieee ;
use ieee.std_logic_1164.all;
USE ieee.std_logic_arith.ALL;
USE ieee.std_logic_signed.ALL;
USE ieee.std_logic_unsigned.ALL;
use work.all;

entity gpc is
port( clk: in std_logic;
x : in std_logic_vector (9 DOWNTO 0); -- Frame x position
y : in std_logic_vector (8 DOWNTO 0); -- Frame y position
xgame : out std_logic_vector (9 DOWNTO 0); --Game x position
ygame : out std_logic_vector (8 DOWNTO 0); --Game y position
disable: out std_logic --Turns off r,g,b when not in play feild
);
END gpc;

ARCHITECTURE behav of gpc is
SIGNAL xgame_temp : std_logic_vector (9 DOWNTO 0);
SIGNAL ygame_temp : std_logic_vector (8 DOWNTO 0);
SIGNAL px, py : std_logic;
begin
process(clk, x, y)
begin
if (clk='1' and clk'event) then -- rising edge triggered
if (x>71 and x<712) then -- y counter and range check
xgame_temp <= (xgame_temp + 1);
px <= '1'; -- x play area indicator
else
px <= '0';
xgame_temp <= "0000000000"; -- reset
end if;
if (y>16 and y<497) then -- y counter and range check
if (x = 713) then -- Only inc y play at end of line scan
ygame_temp <= (ygame_temp + 1);
end if;
py <= '1';
else
py <= '0';
ygame_temp <= "000000000"; -- reset
end if;
end if;
end process;
disable <= (py nand px); -- only go low if no disables
xgame <= xgame_temp;
ygame <= ygame_temp;
END behav;
 
kipman725 wrote:
The problem is that I get
"Warning: Following 20 pins have nothing, GND, or VCC driving datain
port" and no logic is produced for this module. It acts like the x
and y position counters for the frame can never meet the conditions of
the if statments!?!?!
Click to expand...
I expect that x and y are stuck at zero.
Run a sim and see.

-- Mike Treseler
 
On Dec 14, 3:26 pm, Mike Treseler <mtrese...@gmail.com> wrote:
kipman725 wrote:
 The problem is that I get
"Warning: Following 20 pins have nothing, GND, or VCC driving datain
port" and no logic is produced for this module.  It acts like the x
and y position counters for the frame can never meet the conditions of
the if statments!?!?!

I expect that x and y are stuck at zero.
Run a sim and see.

     -- Mike Treseler
Click to expand...
why are x and y stuck at zero though? they are just inputs so should
be able to take any value within there scope.
 
kipman725 wrote:

why are x and y stuck at zero though? they are just inputs so should
be able to take any value within there scope.
Click to expand...
They are signals, not inputs ports,
and synthesis works from port to port.
If no other entity is driving x and y,
synthesis will see it as all '0'
and synthesize nothing.

-- Mike Treseler
 
library ieee ;
use ieee.std_logic_1164.all;
USE ieee.std_logic_arith.ALL;
USE ieee.std_logic_signed.ALL;
USE ieee.std_logic_unsigned.ALL;
use work.all;

begin
process(clk, x, y)
        begin
        if (clk='1' and clk'event) then -- rising edge triggered
Click to expand...
As far as I know, you cant use both ieee.std_logic_signed and unsigned
in the same entity.
Its better to skip both and use ieee.numeric_std with some changes in
the code.
I also noticed that you have x and y in the sensitivity list which is
incorrect. Only clk shall be in the sensitivity list because its a
synchronous process triggered only by clk.

/Peter
 
Look closely at your logic:

if (x>71 and x<712) then -- y counter and range check
xgame_temp <= (xgame_temp + 1);
px <= '1'; -- x play area indicator
else
px <= '0';
xgame_temp <= "0000000000"; -- reset
end if;

The first time through this test let's say x=0. First you check to
see if x is between two numbers. Ok, no it's not between 71 and 712
so let's look at the else condition.
xgame_temp get's set to zero. later on in your code x gets the value
of xgame_temp. Uh oh! Now x is set to zero again!
The second time through the loop will be exactly like the first. X
will never be incremented past zero. Quartus can see this and decides
well gee I'll just set it to zero for you and delete all this other
code that won't ever do anything.

Can you see what you need to do to fix this?

Shannon
 
I have got it working, the problem was the usage of unsigned and
signed so by switching to just using signed all was fixed. The logic
of the if statments is fine and I don't assign anything to x and y. I
succesfully used this as part of some VHDL that generates a 640*480
VGA frame with a border.

--Game Position Counters
--640*480 Pix play feild
library ieee ;
use ieee.std_logic_1164.all;
USE ieee.std_logic_arith.ALL;
USE ieee.std_logic_unsigned.all;
use work.all;

entity gpc is
port( clk: in std_logic;
x : in std_logic_vector (9 DOWNTO 0); -- Frame x position
y : in std_logic_vector (8 DOWNTO 0); -- Frame y position
xgame : out std_logic_vector (9 DOWNTO 0); --Game x position
ygame : out std_logic_vector (8 DOWNTO 0); --Game y position
disable: out std_logic --Turns off r,g,b when not in play feild
);
END gpc;

ARCHITECTURE behav of gpc is
SIGNAL xgame_temp : std_logic_vector (9 DOWNTO 0);
SIGNAL ygame_temp : std_logic_vector (8 DOWNTO 0);
SIGNAL px, py : std_logic;
begin
process(clk)
begin
if (clk='1' and clk'event) then -- rising edge triggered
if (x>71 and x<712) then -- x counter range check
xgame_temp <= (xgame_temp + 1);
px <= '1'; -- x play area indicator
else
px <= '0';
xgame_temp <= "0000000000"; -- reset
end if;
if (y>16 and y<497) then -- y counter range check
if (x = 713) then -- Only inc y play at end of line scan
ygame_temp <= (ygame_temp + 1);
end if;
py <= '1';
else
py <= '0';
ygame_temp <= "000000000"; -- reset
end if;
end if;
end process;
disable <= (py nand px); -- only go low if no disables
xgame <= xgame_temp;
ygame <= ygame_temp;
END behav;
 
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