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d93979b7
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Arnaud Dieumegard
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library IEEE;
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use IEEE.std_logic_1164.all;
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entity time_wizard is
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port
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(
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i_clock: in std_logic;
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i_reset: in std_logic;
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i_raz: in std_logic;
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i_new_centisecond: in std_logic;
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o_limit_reached: out std_logic;
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o_curr_0001_time: out natural range 0 to 9;
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o_curr_0010_time: out natural range 0 to 9;
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o_curr_0100_time: out natural range 0 to 9;
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o_curr_1000_time: out natural range 0 to 5
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);
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end time_wizard;
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architecture Behavioral of time_wizard is
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signal limit_reached: std_logic;
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signal t0001: natural range 0 to 9;
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signal t0010: natural range 0 to 9;
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signal t0100: natural range 0 to 9;
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signal t1000: natural range 0 to 5;
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begin
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P_CENTISECOND_COUNTER: process (i_clock, i_raz)
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begin
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if (i_raz = '1')
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then
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t0001 <= 0;
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else
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if (rising_edge(i_clock))
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then
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if ((i_new_centisecond = '1') and (limit_reached = '0'))
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then
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if (t0001 >= 9)
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then
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t0001 <= 0;
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else
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t0001 <= (t0001 + 1);
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end if;
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end if;
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end if;
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end if;
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end process;
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P_DECISECOND_COUNTER: process (i_clock, i_raz)
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begin
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if (i_raz = '1')
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then
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t0010 <= 0;
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else
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if (rising_edge(i_clock))
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then
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if
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(
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(i_new_centisecond = '1')
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and (limit_reached = '0')
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and (t0001 >= 9)
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)
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then
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if (t0010 >= 9) then
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t0010 <= 0;
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else
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t0010 <= (t0010 + 1);
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end if;
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end if;
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end if;
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end if;
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end process;
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P_SECOND_COUNTER: process (i_clock, i_raz)
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begin
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if (i_raz = '1')
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then
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t0100 <= 0;
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else
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if (rising_edge(i_clock))
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then
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if
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(
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(i_new_centisecond = '1')
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and (limit_reached = '0')
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and (t0010 >= 9)
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and (t0001 >= 9)
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)
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then
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if (t0100 >= 9) then
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t0100 <= 0;
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else
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t0100 <= (t0100 + 1);
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end if;
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end if;
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end if;
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end if;
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end process;
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P_DECASECOND_COUNTER: process (i_clock, i_raz)
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begin
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if (i_raz = '1')
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then
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t1000 <= 0;
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else
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if (rising_edge(i_clock))
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then
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if
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(
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(i_new_centisecond = '1')
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and (limit_reached = '0')
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and (t0100 >= 9)
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and (t0010 >= 9)
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and (t0001 >= 9)
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)
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then
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t1000 <= (t1000 + 1);
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end if;
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end if;
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end if;
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end process;
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limit_reached <=
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'1'
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when
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(
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(t1000 >= 5)
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and (t0100 >= 9)
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and (t0010 >= 9)
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and (t0001 >= 9)
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)
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else '0';
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-- All the Time Wizard's counting is shown to the world.
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o_curr_0001_time <= t0001;
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o_curr_0010_time <= t0010;
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o_curr_0100_time <= t0100;
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o_curr_1000_time <= t1000;
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o_limit_reached <= limit_reached;
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end;
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