-- file:toggle.vhd
------------------------------------------ 
-- Divide the input frequency by 2  
--
-- By Ahmed Allam
-- October 9, 1999
-- University of Alberta, EE552.


library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;

entity toggle is
	port(input  : in std_logic;
	    q : buffer std_logic
	    );
end toggle; 

architecture archdev of toggle is
	signal j,k :std_logic ;
	begin 
		j <= '1';
		k <= '1';
	toggle:process (input)
		begin
			if rising_edge (input) then 
				q <= (j  and not q ) or (not k and q) ;
			end if ;
		end process toggle;
end archdev;