process(EPPDSTB, EPPWR)
	begin

		if (EPPDSTB = '0' and EPPWR = '1') then -- data read
			UsbDB <= DATA; 
		else 
			UsbDB <= (others => 'Z');
	  	end if;

		case ADR is 
			when x"00" => DATA <= x"01";
			when x"01" => DATA <= result_int(15 downto 8);
			when x"02" => DATA <= result_int(23 downto 16);
			when x"03" => DATA <= result_int(31 downto 24);
			when others => DATA <= (others => '0');
		end case;

	   EPPWAIT <= not (EPPASTB and EPPDSTB); 
	end process;