---------------------------------------------
--Project Gump
--Marc Binette
--Ralph Nevins	
--Lambert Lo
----------------------------------------------
--servo_controller_8bithold.vhd
--This holds an eight bit value(data) when load
--is high. It has an asynchronous reset
--input=> load(1bit), data(8bits), reset(1bit)
--output=> hold_out(8bits)

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;

--entity declaration of a generic hold
--default is 8 bits
ENTITY servo_controller_8bithold IS
	GENERIC( holdwidth : positive := 8);
	PORT(load, reset : IN std_logic;
		data : IN std_logic_vector(holdwidth-1 DOWNTO 0);
		hold_out : BUFFER std_logic_vector(holdwidth-1 DOWNTO 0));
END servo_controller_8bithold;

--behavioural discription of the 8bithold
ARCHITECTURE behavioural OF servo_controller_8bithold IS
BEGIN

--process waits for load or reset
hold :PROCESS(load, reset) IS
BEGIN
	--if reset is high then hold_out is set to zero
	IF reset = '1' THEN
		hold_out <= (OTHERS => '0');
	--if no reset but there is a rising edge of load then hold_out is 
	--set equal to data
	ELSIF rising_edge(load) THEN
		hold_out <= data;
	END IF;
END PROCESS hold;

END behavioural;