--
-- Component : stopwatch
--
-- Generated by System Architect version v8.4_3.7 by mrmayer on Feb 9, 1997
-- LAST UPDATED by mrmayer on April 22, 1997
--
-- architecture data_flow is a structural model of the stopwatch
-- entity, using components for each of the drivers, state machines,
-- and memory entities.
--

ARCHITECTURE data_flow OF stopwatch IS
   COMPONENT disp_driver IS
      PORT ( 
         display_time : IN time_stamp;
         indicator_mode : IN blinker;
         sys_clk : IN bit;
         sys_rst : IN bit;
         display_drv : OUT time_disp;
         indicators_on : OUT bit
      );
   END COMPONENT disp_driver;

   COMPONENT main_control IS
      PORT ( 
         current_time : IN time_stamp;
         paused_time : IN time_stamp;
         set_reset : IN bit;
         start_stop : IN bit;
         sys_clk : IN bit;
         sys_rst : IN bit;
         display_time : OUT time_stamp;
         indicator_mode : OUT blinker;
         pause_now : OUT bit;
         reset : OUT bit;
         run_timer : OUT bit
      );
   END COMPONENT main_control;

   COMPONENT switch_filter IS
      PORT ( 
         sr_pressed : IN bit;
         ss_pressed : IN bit;
         sys_clk : IN bit;
         sys_rst : IN bit;
         set_reset : OUT bit;
         start_stop : OUT bit
      );
   END COMPONENT switch_filter;

   COMPONENT time_memory IS
      PORT ( 
         current_time : IN time_stamp;
         pause_now : IN bit;
         sys_clk : IN bit;
         sys_rst : IN bit;
         paused_time : OUT time_stamp
      );
   END COMPONENT time_memory;

   COMPONENT timer IS
      PORT ( 
         reset : IN bit;
         run_timer : IN bit;
         sys_clk : IN bit;
         sys_rst : IN bit;
         current_time : OUT time_stamp
      );
   END COMPONENT timer;

--   FOR ALL : disp_driver USE ENTITY work.disp_driver ;
--   FOR ALL : main_control USE ENTITY work.main_control ;
--   FOR ALL : switch_filter USE ENTITY work.switch_filter ;
--   FOR ALL : time_memory USE ENTITY work.time_memory ;
--   FOR ALL : timer USE ENTITY work.timer ;

   -- Internal Signals
   SIGNAL display_time : time_stamp ;
   SIGNAL indicator_mode : blinker ;
   SIGNAL current_time : time_stamp ;
   SIGNAL paused_time : time_stamp ;
   SIGNAL set_reset : bit ;
   SIGNAL start_stop : bit ;
   SIGNAL pause_now : bit ;
   SIGNAL reset : bit ;
   SIGNAL run_timer : bit ;

BEGIN

   instance_disp_driver : COMPONENT disp_driver
      PORT MAP ( 
         display_time,
         indicator_mode,
         sys_clk, 
         sys_rst,
         display_drv,
         indicators_on 
      );

   instance_main_control : COMPONENT main_control
      PORT MAP ( 
         current_time,
         paused_time,
         set_reset,
         start_stop,
         sys_clk,
         sys_rst,
         display_time,
         indicator_mode,
         pause_now,
         reset,
         run_timer
      );

   instance_switch_filter : COMPONENT switch_filter
      PORT MAP ( 
         sr_pressed,
         ss_pressed,
         sys_clk,
         sys_rst,
         set_reset,
         start_stop
      );

   instance_time_memory : COMPONENT time_memory
      PORT MAP ( 
         current_time,
         pause_now,
         sys_clk,
         sys_rst,
         paused_time
      );

   instance_timer : COMPONENT timer
      PORT MAP ( 
         reset,
         run_timer,
         sys_clk,
         sys_rst,
         current_time
      );

END data_flow ;

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