alert.vhd

有关数字钟的

library ieee;
use ieee.std_logic_1164.all;
entity alert is
port(clkspk:in std_logic;
	second,minute:in std_logic_vector(7 downto 0);
	speak:out std_logic;
	lamp:out std_logic_vector(8 downto 0));
end alert;
architecture behave of alert is
begin
process(clkspk,second,minute)
begin
if(clkspk'event and clkspk='1')then
	if(minute="01011001")then
	case second is
		when"01010001"=>lamp<="000000001";speak<='0';          
		when"01010010"=>lamp<="000000011";speak<='1';
		when"01010011"=>lamp<="000000111";speak<='0';
		when"01010100"=>lamp<="000001111";speak<='1';
		when"01010101"=>lamp<="000011111";speak<='0';
		when"01010110"=>lamp<="000111111";speak<='1';
		when"01010111"=>lamp<="001111111";speak<='0';
		when"01011000"=>lamp<="011111111";speak<='1';
		when"01011001"=>lamp<="111111111";speak<='0';
		when others=>lamp<="000000000";speak<='0';
	end case;
	end if;
end if;
end process;
end behave;