--------------------------------------
-- generate squares
-- using a counter and multiplier
-- test of simulation time pre- and post- synthesis

package square_pkg is
	constant counterWidth : positive :=16;
end square_pkg;

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
library work;
use work.square_pkg.all;

entity squares is
	port( reset, clock : in std_logic;
		square : out unsigned(2*counterWidth-1 downto 0));
end entity;

architecture rtl of squares is
begin

doSquares: process is
variable count: natural range 0 to 2**counterWidth-1;

begin
	wait until rising_edge(clock);
	if reset = '1' then
		count := 0;
		square <= (others=>'-');
	else
		count := count + 1;
--		  without magic numbers
--		square <= conv_unsigned(count * count,2*counterWidth); -- type conversion
--		  and compatible with all versions of maxplus2
--		  the second parameter to conv_unsigned() should equal 2*counterWidth
		square <= conv_unsigned(count * count,32); -- type conversion
	end if;
end process doSquares;

end architecture rtl;