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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, H U2 r4 C% Z
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??8 M, c! K- X! A2 O% E& g8 y) @
entity clk_95 is
0 c( ?: J: c( N% ]. }( C( F Port ( clk40 : in STD_LOGIC;( b) } |' |$ X! k5 i
enable : in STD_LOGIC;, a! Q, K9 `8 l& n
switch : in STD_LOGIC;3 x) e7 t. H1 e$ h6 F% Z, R
a,b,c,d,e,f,g,p : out STD_LOGIC;
3 e/ m4 T/ i5 i2 `9 k0 F. S3 M4 M SEL : OUT STD_LOGIC_VECTOR (5 DOWNTO 0));
- y' s' h+ \/ V8 Y c8 O7 b2 gend clk_95; y3 [$ i/ p$ M
. n1 |3 u$ s0 M! X, sarchitecture Behavioral of clk_95 is
1 x5 W/ U8 ?3 e/ ^signal clk1 : STD_LOGIC ;
( l( h' V: T2 {signal cnt : STD_LOGIC ;9 D% F9 f* X# \+ P
signal x1 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);
3 u8 y( a) ]" P' p5 Z) Hsignal x2 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);
' F7 Y5 q8 c- Lsignal count1 : STD_LOGIC_VECTOR (3 DOWNTO 0);! G$ b* F' ]+ \% N, t" v' p5 B
signal count2 : STD_LOGIC_VECTOR (3 DOWNTO 0);* y9 B+ a* O8 _2 M4 d/ O' k
signal y : STD_LOGIC_VECTOR (7 DOWNTO 0);1 G q1 B" {- }8 X/ o
begin
3 y/ s! r) \! b
! o/ j8 i' b8 r2 \ process(clk40)
8 ~# Z* B8 d7 Q9 Z variable cnt:integer range 0 to 39999999;; d. c, t4 a* N8 c; Y. ]
begin
T9 |: t8 l* b7 R3 h if clk40'event and clk40='1' then
5 _8 _1 j2 e! t+ q3 x if cnt<20000000 then& p9 I: Y4 g1 j) G: Z* c% h" d
cnt:= 0 ;
% N# G! c" R6 N5 L else : J0 D- a7 d* c
cnt:= 1 ;6 [4 H& n# p# x8 V3 g' b+ J
end if;$ v/ ~9 [/ x: n/ @( Y/ y; F
end if;
0 H5 r% s9 B! K7 G" v1 {, ^ end process;* t/ _1 V" a0 n( a% D
clk1<=cnt;
! _$ T7 k, Z! q. S# h2 l- y
" I$ X& W* d4 p process(clk1)% q5 B+ R1 c0 e( O5 f/ r. _5 z
begin
# W$ w) b7 O# t2 _# w if clk1'event and clk1='1' then
3 O$ e% L3 h1 h4 U if switch='0' then
2 a6 u3 P2 _: U4 q; `: b count1<=count1 + 1 ;
# |! ?6 C( F& c- h3 O- T- o( X/ L if count1="0110" then" |6 b6 Z m+ E% L5 t+ ^
count1<="0000" ;
- @' j" R* X$ h+ K end if;
0 e" U7 D O9 m u: C k. @7 K else
2 V1 c3 k% k) q9 Y2 y$ w1 A count2<=count2 + 1;' P9 n5 R a+ S. y; I
if count2="1000" then+ G! C, J4 @+ h8 F, s1 a5 f$ C1 ]$ b
count2<="0000" ;
& x3 M* w6 Y) ?6 p. H end if;
1 P" X, p& @; `+ w end if;
2 A- \5 Q; d- }, a# a4 q# P end if;" N. f2 s+ p' m2 j* U9 n- T% O& B
end process;. ?2 p2 v" i6 d/ {
後面是我自己要接出去的東西~所以我沒PO!! |
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