clockrun.vhd

关于自动打铃器的程序设计。应该还是不错的哦！~

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;

 entity clockrun is
   port( clk:        in std_logic;
         settime:    in std_logic;
         hourhset:   in integer range 0 to 2;
         hourlset:   in integer range 0 to 9;
         minhset:    in integer range 0 to 5;
         minlset:    in integer range 0 to 9;
         sechset:    in integer range 0 to 5;
         seclset:    in integer range 0 to 9;
 
         hourhdis:   out integer range 0 to 2;
         hourldis:   out integer range 0 to 9;
         minhdis:    out integer range 0 to 5;
         minldis:    out integer range 0 to 9;
         sechdis:    out integer range 0 to 5;
         secldis:    out integer range 0 to 9);
 end clockrun;

 architecture runarchi of clockrun is
    signal seclow,minlow,hourlow: integer range 0 to 9;
    signal sechigh,minhigh: integer range 0 to 5;
    signal hourhigh: integer range 0 to 2;
  begin
    secldis<=seclow;
    sechdis<=sechigh;
    minldis<=minlow;
    minhdis<=minhigh;
    hourldis<=hourlow;
    hourhdis<=hourhigh;

 normal_run:
    process(clk,settime)
     begin
        if settime='1' then
           seclow<=seclset;
           sechigh<=sechset;
           minlow<=minlset;
           minhigh<=minhset;
           hourlow<=hourlset;
           hourhigh<=hourhset;
         else
           if clk='1' and clk'event then
             if seclow=9 then
                 seclow<=0;
               if sechigh=5 then
                   sechigh<=0;
                 if minlow=9 then
                     minlow<=0;
                   if minhigh=5 then
                       minhigh<=0;
                     if hourlow=9 then
                        hourlow<=0;
                        hourhigh<=hourhigh+1;
                      elsif hourlow=3 and hourhigh=2 then
                         hourhigh<=0;
                         hourlow<=0;
                       else hourlow<=hourlow+1;
                      end if;
                     else
                         minhigh<=minhigh+1;
                     end if;
                   else
                       minlow<=minlow+1;
                   end if;
                 else
                     sechigh<=sechigh+1;
                 end if;
               else
                   seclow<=seclow+1;
               end if;
            end if;
          end if;
       end process;
     end runarchi;