救命啊，各位高手啊

Post Time: 2008-8-17 6:57:45

library ieee;
exx f_1s6xuse ieee.std_logic_1164.all;
~#i"|kikd k
entity clk_3d is
$|%g*coo*b
z7|hc  port(    clk: in std_logic;
&k?nw^]z;iy           rst: in std_logic;
.qr)}a)v`]       clk_out: out std_logic);
.h8t-@a,j9}sv'xend entity clk_3d;

5g%w;}3rx,a!|\architecture behavior of clk_3d is
     signal cnt1,cnt2: integer range 0 to 2:=0;
  signal temp1, temp2: std_logic:='0';
begin
)ahh/`0nuu&?rb  process(rst,clk)
9r'z3dya  begin
  if rst='0' then
     if rising_edge(clk) then
          if cnt1=2 then
              cnt1<=0;
*y6c2hp1`6p              temp1<= not temp1;
8i4t/z^;y {          elsif cnt1=1 then
              temp1<= not temp1;
               cnt1<=cnt1+1;
           else
             cnt1<=cnt1+1;
;fxvzy\)v           end if;
'x/~e3@nn;tzl#su       end if;
8kia#ej&t%w?)]    if falling_edge(clk) then  // 这儿的if  怎么来的？？
       if cnt2=2 then
er(qokq-a2h9{         cnt2<=0;
)c7moz5ze9@#aqeq         temp2<=not temp2;
dd"`uv        elsif cnt2=1 then
ch1m)u3]n        temp2<= not temp2;
        cnt2<=cnt2+1;
|rii&l        else
$h(ic2w'm`}$ej3i2eo        cnt2<=cnt2+1;
       end if;
e9qan+a~~   end if;
0]"{y? wo|%j1l\o0lend if;
&r.z"yx+["n1v9a9h4e%m

iolxm$j
end process;
clk_out<=temp1 or temp2;
;_8euxie@i6h(w/kend architecture behavior;
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