alarm_counter.vhd

来自「在ACEX EP1K30TC144-3实现了闹钟功能,并能修改定时,和当前时间」· VHDL 代码 · 共 66 行

--时间计数器的源程序ALARM_COUNTER.VHD
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE WORK.P_ALARM.ALL;
ENTITY ALARM_COUNTER IS
    PORT(NEW_CURRENT_TIME:IN  T_CLOCK_TIME;
         LOAD_NEW_C:      IN  STD_LOGIC;
         CLK:             IN  STD_LOGIC;
         RESET:           IN  STD_LOGIC;
         CURRENT_TIME:    OUT T_CLOCK_TIME);
END ENTITY ALARM_COUNTER;
ARCHITECTURE ART OF ALARM_COUNTER IS
    SIGNAL I_CURRENT_TIME : T_CLOCK_TIME;
BEGIN
    PROCESS(CLK,RESET,LOAD_NEW_C,NEW_CURRENT_TIME) IS
        VARIABLE C_T:T_CLOCK_TIME;
    BEGIN
        IF RESET = '1' THEN
            I_CURRENT_TIME <= (OTHERS=>0);
        ELSIF LOAD_NEW_C ='1' THEN
            I_CURRENT_TIME <= NEW_CURRENT_TIME;
        ELSIF RISING_EDGE(CLK) THEN
            C_T := I_CURRENT_TIME;
            IF C_T(0) < 9 THEN             
                C_T(0) := C_T(0) + 1;
            ELSE        
                C_T(0) := 0;
                IF C_T(1) < 5 THEN
                    C_T(1) := C_T(1) + 1;
----------------------------------------------
                ELSE
                    C_T(1) := 0;
                    IF C_T(2) < 9 THEN             
                    C_T(2) := C_T(2) + 1;
                    ELSE        
                        C_T(2) := 0;
                        IF C_T(3) < 5 THEN
                            C_T(3) := C_T(3) + 1;
------------------------------------------------
                        ELSE
                            C_T(3) := 0;
                            IF C_T(5) < 2 THEN
                                IF C_T(4) < 9 THEN
                                    C_T(4) := C_T(4) + 1;
                                ELSE
                                    C_T(4) := 0;
                                    C_T(5) := C_T(5) + 1;
                                END IF;
                            ELSE
                                IF C_T(4) < 3 THEN
                                    C_T(4) := C_T(4) + 1;
                                ELSE
                                    C_T(4) := 0;
                                    C_T(5) := 0;
                                END IF;
                            END IF;
                        END IF;
                    END IF;
                END IF;
            END IF;
            I_CURRENT_TIME <= C_T;
        END IF;
    END PROCESS;
    CURRENT_TIME <= I_CURRENT_TIME;
END ARCHITECTURE ART;