alert.vhd

数字显示当前的小时、分钟、秒； 2、可以预置为12小时计时显示和24小时计时显示； 3、一个调节键

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY ALERT IS
PORT(MIN1,MIN0,SECOND1,SECOND0:IN STD_LOGIC_VECTOR(3 DOWNTO 0);
    CLK:IN STD_LOGIC;
   QLK:OUT STD_LOGIC);
END ALERT;
ARCHITECTURE SSS_ARC OF ALERT IS
  BEGIN
  PROCESS(CLK)
  BEGIN
  IF CLK'EVENT AND CLK='1' THEN
IF MIN1="0101" AND MIN0="1001" AND SECOND1="0101" AND SECOND0="1001" THEN
QLK<='1';
ELSE
QLK<='0';
END IF;
END IF;
END PROCESS;
END SSS_ARC;