----------------------------------------------------------------------------
-- Lawrence Berkeley National Laboratory (c) 1997
-- BaBar Trigger Electronics
----------------------------------------------------------------------------
-- Description:  
--    16 bit wide synchronous latch
----------------------------------------------------------------------------
-- Author:   Armin Karcher
-- History:
--    Karcher    03/97 - First Version
----------------------------------------------------------------------------

library IEEE;
use IEEE.std_logic_1164.all;

----------------------------------------------------------------------------
--PORT DECLARATION
----------------------------------------------------------------------------

entity latch16 is
  port	(clk 	: in  std_logic;	-- clk60 input, distributed
	rst 	: in  std_logic;	-- global reset
	enable 	: in  std_logic;	-- enable latch
	data_in	: in  std_logic_vector(15 downto 0); -- data in
	data_out: out  std_logic_vector(15 downto 0) -- latched data
        );
end latch16;

architecture rtl of latch16 is
----------------------------------------------------------------------------
--SIGNAL DECLARATION
----------------------------------------------------------------------------
  signal reg_val: std_logic_vector(15 downto 0); -- latched data 

begin
 
----------------------------------------------------------------------------
--PROCESS DECLARATION
----------------------------------------------------------------------------
 lat: process (clk,rst,enable)
  begin
    if (rst = '1') then
      reg_val <= "0000000000000000";
    elsif (clk'event and clk = '1' ) then
      if (enable = '1') then
        reg_val <= data_in;     -- synchronous latch
      end if;
    end if;
  end process;

----------------------------------------------------------------------------
--OUTPUT ASSIGNMENTS
----------------------------------------------------------------------------
   data_out <= reg_val;

end rtl;