act.vhd

可以实现时间调节

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;
entity act is
port
(
		clk, clr: in std_logic;
		second,minute,hour : in  std_logic_vector (6 downto 0);
		set_clk: in std_logic;
		 dot:  out std_logic;
		daout1   : out  std_logic_vector( 6 downto 0);
		sel1       : out  std_logic_vector( 5 downto 0));
end entity act;

architecture fun of act is
signal sel:std_logic_vector( 5 downto 0);
signal count: std_logic_vector ( 2 downto 0);
signal num:   std_logic_vector ( 3 downto 0);
signal daout: std_logic_vector ( 6 downto 0);

begin

process ( clk,clr,num)
begin 
if (clr ='1') then
count <= "000";
elsif (clk'event and clk='1') then 

    if ( count = "000") then
      if(set_clk='1')then
      num<="0000";
     else
      num<=second(3 downto 0);dot<='0';end if;sel<="000001";
     end if;
     if( count ="001") then
          if(set_clk='1')then
      num<="0000";
     else
        num(3)<='0'; num(2 downto 0)<=second(6 downto 4);dot<='0';end if;sel<="000010";
      end if;
      if( count ="010") then
         num<=minute(3 downto 0);dot<='1';sel<="000100";
       end if;
       if(count ="011") then
         num(3)<='0'; num(2 downto 0)<=minute(6 downto 4);dot<='0';sel<="001000";
        end if;
       if(count ="100")then 
          num<=hour(3 downto 0);dot<='1';sel<="010000";
         end if;
       if(count ="101")then 
          num(3)<='0'; num(2 downto 0)<=hour(6 downto 4);dot<='0';sel<="100000";
         end if;
        if(count ="110")then
         count<="000";sel<="000000";
         end if;
           count<=count+1; 
 end if;
   if(num= "0000")then
       daout<="0111111";end if;
    if(num= "0001")then
       daout<="0000110";end if;
    if(num= "0010")then
       daout<= "1011011";end if;
     if(num= "0011")then
       daout<="1001111"; end if;
      if(num= "0100")then
       daout<="1100110"; end if;
      if(num= "0101")then
       daout<="1101101";  end if;
       if(num= "0110")then
       daout<="1111101";  end  if;
       if(num="0111")then
       daout<="0000111" ; end if;
       if(num= "1000")then
        daout<="1111111" ; end if;
        if(num="1001")then
        daout<="1101111"  ;end if;
 end process;
    sel1<=sel;
    daout1<=daout;

end architecture fun;