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3#
樓主 |
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
* D' K1 \# I w/ T. F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 c# D$ {8 u* u n- i+ a! }" Zentity clk_95 is
. A5 I0 e; I l) J1 @( M Port ( clk40 : in STD_LOGIC;; J& l5 E$ }9 z% B8 ~- R
enable : in STD_LOGIC;" q7 Q! p0 `5 [+ {$ u0 w
switch : in STD_LOGIC;
+ y( d! O1 r3 u! _1 y: E" P! l5 n3 Y) I a,b,c,d,e,f,g,p : out STD_LOGIC;
$ u( W3 a$ F% `: j+ S) S4 C SEL : OUT STD_LOGIC_VECTOR (5 DOWNTO 0));
3 w/ J' ^4 V( F0 J6 j; Bend clk_95;+ g# Z! L7 s6 |. ? V' j
, f7 x, t5 l9 x2 qarchitecture Behavioral of clk_95 is$ F4 v. N1 G0 g: r3 ^+ E( k
signal clk1 : STD_LOGIC ;1 F( L' A5 e ~
signal cnt : STD_LOGIC ;) n9 |8 g, ~, ^3 R7 _
signal x1 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);
: [8 R0 W# o6 w3 G6 Esignal x2 : STD_LOGIC_VECTOR ( 3 DOWNTO 0);0 l! g% P0 m# h
signal count1 : STD_LOGIC_VECTOR (3 DOWNTO 0);' K0 ^4 g5 G4 d7 E; k! C8 Z
signal count2 : STD_LOGIC_VECTOR (3 DOWNTO 0);1 ?4 [; e" b D% z6 f
signal y : STD_LOGIC_VECTOR (7 DOWNTO 0);) ]# b) Z) c6 X) Q5 j/ D9 w
begin
$ Y, V0 S, _9 ]( Z7 K1 ~7 S- c* c; N1 K- x) W( z# P( h
process(clk40)
4 Z) l0 b* W1 S% D variable cnt:integer range 0 to 39999999;/ c+ u$ ]8 w+ m/ x% [
begin
- V: B/ ]. @! S3 z, w! E- Z if clk40'event and clk40='1' then
( S. ]3 S) w* l, O6 M/ [ if cnt<20000000 then: G3 E9 q, }* ?
cnt:= 0 ;
- Z3 l$ _1 ^* R' {% j% _5 H else 3 K: `: G1 S! a8 W
cnt:= 1 ;( U# v$ }! K9 E; Q8 U. Y
end if;$ i% h7 H' e4 l
end if;- [* j" X" g; I
end process;/ o$ Q2 H% `( z% }
clk1<=cnt;9 q( D- V) w7 |! n2 ^/ s% D
% F* r8 X8 R; W$ l5 n; J3 I0 X
process(clk1) m N+ z/ M6 n
begin, J% A8 z$ @7 Z
if clk1'event and clk1='1' then
+ S3 B) ~4 W4 b if switch='0' then' c* W3 i/ C4 [# q
count1<=count1 + 1 ;
& ?* R/ H" D; r if count1="0110" then
, `: R3 g# t8 g$ V count1<="0000" ;
. o' e* Y+ Z5 Z) M K* E$ a end if;. }% k& @ u, r3 P. k9 n% ?
else
0 r, G5 U8 x* I8 W count2<=count2 + 1;
9 t( d1 s/ u; @# O0 e3 m: {" n if count2="1000" then
3 ` G# @! K1 l- d) H$ {/ [ count2<="0000" ;7 b4 y: R( s3 j4 L9 z4 {
end if;
. B. t0 ^+ G5 i end if;
4 [, D. o8 S( H& U s7 H end if;
& Q2 \1 e/ b5 \( W, z! N y end process;
: E2 n8 c* Z$ s8 J( \$ }後面是我自己要接出去的東西~所以我沒PO!! |
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