alarm_reg.vhd

在ACEX EP1K30TC144-3实现了闹钟功能,并能修改定时,和当前时间

--闹钟寄存器的源程序ALARM_REG.VHD
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE WORK.P_ALARM.ALL;
ENTITY ALARM_REG IS
    PORT(NEW_ALARM_TIME:IN  T_CLOCK_TIME;
         LOAD_NEW_A :   IN  STD_LOGIC;
         CLK :          IN  STD_LOGIC;
         RESET :        IN  STD_LOGIC;
         ALARM_TIME:    OUT T_CLOCK_TIME);
END ENTITY ALARM_REG;

ARCHITECTURE   ART   OF   ALARM_REG   IS
BEGIN
    PROCESS(CLK,RESET) IS
    BEGIN
        IF RESET = '1'THEN
            ALARM_TIME <= (OTHERS=>0);       --(0,0,0,0);
        ELSE
            IF RISING_EDGE(CLK) THEN
                IF LOAD_NEW_A = '1'THEN
                    ALARM_TIME <= NEW_ALARM_TIME;
                ELSIF LOAD_NEW_A /= '0'THEN
                    ASSERT FALSE REPORT"UNCERTAIN LOAD_NEW_ALARM CONTROL!"
                    SEVERITY WARNING;
                END IF;
            END IF;
        END IF;
    END PROCESS;
END ARCHITECTURE ART;