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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- n. b3 Y' V' p8 o3 s% k8 `7 V
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??" X: \2 ^4 l i* B" V, Z2 l
entity clk_95 is
. |5 X# E; o. I R/ t7 Z0 t4 M Port ( clk40 : in STD_LOGIC;
1 ?: L5 }2 t* k5 l: n( A9 @ enable : in STD_LOGIC;1 a: J$ b2 }8 r+ u6 P1 {8 g( [
switch : in STD_LOGIC;
* @3 | z5 m o# T: F( _+ P/ p a,b,c,d,e,f,g,p : out STD_LOGIC;
9 B+ [$ O" n. X0 o SEL : OUT STD_LOGIC_VECTOR (5 DOWNTO 0));
$ [/ p B2 g0 V5 a' R6 rend clk_95;3 ~( v. I. C/ E) T' V4 c2 G
: l! h. o* T: {# _/ w3 u3 ]" {
architecture Behavioral of clk_95 is
' w; w, a3 p" r+ x h+ \6 G- Wsignal clk1 : STD_LOGIC ;8 c/ k" p- e& V2 j: F7 |9 [
signal cnt : STD_LOGIC ;
M& E: j9 _) a' c/ p1 @; h5 wsignal x1 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);5 s0 [1 Q" ~5 ?7 T+ j
signal x2 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);
5 z1 M( A' E$ Usignal count1 : STD_LOGIC_VECTOR (3 DOWNTO 0);( r* y) \- F4 Q# l: L
signal count2 : STD_LOGIC_VECTOR (3 DOWNTO 0);
- g* Q+ X: K9 {# V3 o; }signal y : STD_LOGIC_VECTOR (7 DOWNTO 0);3 y2 v+ M& u. T# x/ |7 d
begin L% Z3 v# ?! Q! L( G
/ o$ J) R$ B; \0 X4 T& m8 O. M
process(clk40)
$ R% d& _ O( ?1 A$ J variable cnt:integer range 0 to 39999999;
/ F7 C; R$ T, G% `4 m begin
, K0 D/ w3 x( m* F9 x if clk40'event and clk40='1' then
, a/ k- F2 {( ] if cnt<20000000 then
" ~' q& }& G9 Z9 h3 A4 ?! U1 t cnt:= 0 ;
" I2 \/ o8 w! q: ]; h# b else
/ i- @9 J0 ~* P3 g# T; ] cnt:= 1 ;1 C* x4 u1 V! t3 h4 K$ T
end if;- Q- q6 E8 }1 [
end if;; o& G# s2 a) F4 A4 U% \
end process;
0 p2 A- c8 @7 l- s; | clk1<=cnt;
3 Y2 S* F9 E6 j R, F
! o) |6 W& d! P7 }; b3 X process(clk1)* w1 o% r9 E- z4 u& c0 I# Z9 b- L
begin$ o6 r. X, W/ e
if clk1'event and clk1='1' then% ]$ t7 w; A; E( ?: W+ h; C) Q9 v: M
if switch='0' then0 M% q$ @$ D; \. e% z( B0 w
count1<=count1 + 1 ;
& q% f' w2 D' B; }9 t if count1="0110" then
! t0 h+ a; E# c ]7 V count1<="0000" ;
6 ~6 u6 @9 z& _/ T9 [( m end if;
6 ^+ r5 F1 B: e, L else! J4 f% w( X7 @" w" d, Y
count2<=count2 + 1;
0 g q' D: d* X$ a* L8 l" |% A if count2="1000" then
( z" F$ a& i: |5 T% N# ^ D: I% {2 m; w count2<="0000" ;5 {; z# X$ H$ F- \
end if;
1 \& J: k# y2 `' a! F end if;
/ o$ q y% C6 D2 r+ b end if;
( Z' s1 `) |6 \' M1 | end process;$ Y# Y" j# L; Y
後面是我自己要接出去的東西~所以我沒PO!! |
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