--==========================================================
-- Design units : StopWatchBehave (Entity,Architecture)
--
-- File name : StopWatchBehave.vhd
--
-- Purpose : Behavioral description of a StopWatch
--
-- Limitations : none
--
-- Library : IEEE
--
-- Dependencies : StopPackage,Pulse Generator,StopWatchBehave,StopWatchStruc
--
-- Author : Claus-Juergen Thomas, REFT
--
-- Simulator : Synopsys V3.1a on SUN SPARCstation 10
--
-----------------------------------------------------------
-- Revision list
-- Version Author Date Changes
--
-- v 1.0 cjt 18.01.96 new
--=========================================================
LIBRARY IEEE;
USE IEEE.std_logic_1164.all;
USE work.ELEMpack.all;
ENTITY StopWatchBehave IS
PORT(StartStop : IN std_logic;
Reset : IN std_logic;
Clk : IN std_logic;
Tenths_out : OUT integer;
Seconds_out: OUT integer;
Tens_out : OUT integer);
END StopWatchBehave;
--============================ARCHITECTURE==================
ARCHITECTURE Behavior OF StopWatchBehave IS
SIGNAL tenths,seconds,tens,counter:integer:=0;
BEGIN
main: PROCESS (Clk,Reset)
BEGIN
IF StartStop = '1' THEN
IF StartStop'EVENT THEN
Tenths <= 0;
END IF;
IF Clk'EVENT AND Clk = '1' THEN
Tenths <= tenths + 1;
IF Tenths = 9 THEN
Seconds <= Seconds + 1;
Tenths <= 0;
IF Seconds = 9 THEN
Tens <= Tens + 1;
Seconds <= 0;
IF Tens = 5 THEN
Tens <= 0;
END IF;
END IF;
END IF;
END IF;
END IF;
IF Reset = '0' THEN
Tenths <= 0;
Seconds <= 0;
Tens <= 0;
END IF;
END PROCESS;
Tenths_out <= Tenths;
Seconds_out <= Seconds;
Tens_out <= Tens;
END Behavior;
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