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3#
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發表於 2008-5-18 17:13:16
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恩~是的~我是要把它除到1HZ因為實驗器材的內部震盪晶體為40MHZ
/ {8 e: ?* u3 q8 X除完1HZ接上計數器這樣~下面是我後來又改的><" 難道精準式除頻有很多種方法做??" L. p# {) D! Y8 u3 {5 w) D; o. g
entity clk_95 is
0 c% ~) K4 q+ j) s) W+ F Port ( clk40 : in STD_LOGIC;# {4 V1 e$ H) c+ x. b
enable : in STD_LOGIC;
' e" ^, U( ~4 C" q5 `8 ~ switch : in STD_LOGIC;2 N5 E2 G( j; {! @
a,b,c,d,e,f,g,p : out STD_LOGIC;
3 t4 Y3 p4 f/ m6 t" k" ? SEL : OUT STD_LOGIC_VECTOR (5 DOWNTO 0));
) |0 g! B# \2 L) G) _ m# j5 ]end clk_95;
7 ]$ z3 k2 g* l8 m A' ]9 D8 U" y, `' E4 P5 q9 z& s
architecture Behavioral of clk_95 is
$ k# v6 D" R% H) J- h% b+ ~9 csignal clk1 : STD_LOGIC ;
- d* h& B8 I, ]+ Y5 Y) t- ^signal cnt : STD_LOGIC ;
. L; U# r. [, O! Z+ e+ z( usignal x1 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);. m3 t$ |+ _ D: l7 g9 ^/ q6 g7 b
signal x2 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);0 \3 w$ H" ?: [5 r+ R
signal count1 : STD_LOGIC_VECTOR (3 DOWNTO 0);
4 D/ m3 B6 t/ Y' W/ W$ h. R: Xsignal count2 : STD_LOGIC_VECTOR (3 DOWNTO 0); H$ _' F# U/ o6 _% Y5 ^% }
signal y : STD_LOGIC_VECTOR (7 DOWNTO 0);0 w- ]" r6 g- A3 x$ A5 i
begin
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" @: i3 l4 q' C/ G process(clk40)
- D! x5 n7 F0 G$ j variable cnt:integer range 0 to 39999999;/ A8 w' B- g8 s3 A
begin, Q6 |: G. q/ |" A* C- ^& Y& b
if clk40'event and clk40='1' then
. |3 `, }0 ~8 i, Q) M! a/ T if cnt<20000000 then* ~4 [7 J9 S2 G
cnt:= 0 ;
3 h$ i+ s7 l$ h1 E/ U else
+ r7 b2 t. u. H9 u* m cnt:= 1 ;# y, G* [$ p4 @- h
end if;9 ]9 [; k& z$ [1 U) g# C) a
end if;
+ I. h) S4 r" @, f end process;
5 I7 X7 n6 _/ z: U clk1<=cnt;
+ ~* j. ^( y8 q3 ] 6 Y* W5 h2 g7 B0 r; x7 g- K. A
process(clk1)8 p: U% c. O' S* U j% K' D/ x
begin" q; _6 M/ Z4 @1 y1 @! V6 ~& n) P
if clk1'event and clk1='1' then
* |% V5 q2 @, _9 L( v% q2 e if switch='0' then: g# n+ t+ R) }, k/ G2 z
count1<=count1 + 1 ;; h0 ?: s* |, W0 @# @6 J5 d5 b
if count1="0110" then
& [& W2 R1 a' T count1<="0000" ;
3 Q$ \( e4 B' r end if;0 w5 j' F! f5 q7 A2 f2 e
else# w( U4 m) ?. k, h0 }0 t
count2<=count2 + 1;) r8 G/ A# @8 ~- E7 n
if count2="1000" then& t9 L2 d8 }9 Y" {9 C9 w4 T5 s1 Y
count2<="0000" ;, s$ ]$ V4 X) \
end if;
* ?' W7 d+ G$ {& s1 l, s end if;
, j% u$ C9 u8 C$ n end if;. y' q9 l1 ?1 K7 R+ o* d
end process;- k8 Q$ a U7 D! \2 S
後面是我自己要接出去的東西~所以我沒PO!! |
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