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發表於 2008-10-7 19:33:22
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LIBRARY ieee; 0 c: M) s9 Q$ m6 T7 D* d
USE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;5 Z: Z+ L+ k* |; i2 |3 f
ENTITY counter_60_seg_v IS2 k- r3 J: g2 f5 l$ {
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;9 _6 C0 d* Z8 _! Y
D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);! Q/ a& K8 j' b' |7 A0 {& S
Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);1 Z6 `8 S3 ?& ?7 ?
Co : OUT STD_LOGIC);
9 w6 t i: |- T3 @! F `6 `. \END counter_60_seg_v;3 Q- Y) v% l; j+ Q8 K2 S& ?
ARCHITECTURE arc OF counter_60_seg_v IS
$ V. \8 H' v8 M0 r, w. X BEGIN
0 I$ V" B( M2 |6 n PROCESS (Clk)
. @! _8 i/ z/ g: l* [ VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);
/ F& t- k) Y' L o BEGIN7 m( _1 d7 _' e
IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";: T( @6 e9 G- w' u( h9 \) K
ELSE IF (Clk'event AND Clk='1') THEN) u6 j7 L! ^2 h' U2 F
IF Load='0' THEN imper0 :=D0; imper1:=D1;
+ c5 H9 L; }1 \$ m' Z) U0 }) f ELSIF Ena='1' THEN
( |8 c: n/ h5 Q- y5 |2 i5 V1 | IF imper0="1000" AND imper1="0101" THEN
0 W' L: N' W+ e6 N imper0:="1001";
L. ^1 y" b/ D6 b ELSIF imper0<"1001" THEN imper0 := imper0+1;1 w. F9 G) t5 t9 Y
ELSE imper0:="0000";
8 S7 {2 R+ s2 Y G+ I% c IF imper1<"0101" THEN imper1:= imper1+1;. M. [. h4 S5 m+ ~0 f: ~1 j
ELSE imper1:="0000"; # o o7 v z5 K- W! F$ O
END IF;# ^/ p% X; U) G' s* [9 B
END IF;
) s8 i, Q* N+ b6 Y* m+ N; L END IF;+ G c3 f6 f6 Z. r8 D" n) N% w' k% K1 }
END IF;
! Q7 [5 G' w, w b7 D END IF;
2 N) p v& `( M4 {( `% F Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena;
7 }! z! h7 U8 X: P( L; ?3 w Q0 <= imper0; Q1 <= imper1;
4 a9 ^; B, v( s, O- T( b. t END PROCESS ;
9 P. `/ {+ B- a' C/ s+ SEND arc;4 H- R+ {0 h9 ^. e, P% g
0 r; ]& m* \& `9 e0 k" G
這個是60模計數器設計
$ |8 D0 l( w% K: X要怎弄成倒數60?
7 f# _* z- K0 W# V有人會用成倒數60秒先幫忙吧
, l3 u/ q5 L M7 G9 C* w請問一下我會用到幾對幾的多工器啊 |
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