key_buffer.vhd

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

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE WORK.P_ALARM.ALL;
ENTITY KEY_BUFFER IS
    PORT( KEY :IN T_DIGITAL;
          CLK :IN STD_LOGIC;
          RESET :IN STD_LOGIC;
          NEW_TIME:OUT T_CLOCK_TIME);
END ENTITY KEY_BUFFER;
ARCHITECTURE ART OF KEY_BUFFER IS
    SIGNAL N_T:T_CLOCK_TIME;
BEGIN
    SHIFT:PROCESS(RESET,CLK) IS    
    BEGIN
        IF (RESET = '1') THEN
            N_T <= (OTHERS=>0);       --(0,0,0,0);
        ELSIF (CLK'EVENT AND CLK = '1' )THEN 
            --FOR I IN N_T[1] 'LENGTH DOWNTO 1 LOOP
            FOR I IN 5 DOWNTO 1 LOOP
                N_T(I) <= N_T(I-1);
            END LOOP;
            N_T(0) <= KEY;
        END IF;
    END PROCESS SHIFT;
    NEW_TIME <= N_T;
END ARCHITECTURE ART;