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發表於 2008-10-7 19:33:22
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LIBRARY ieee;
, A. o- @7 i/ L$ ]6 f4 Z2 `" kUSE ieee.std_logic_1164.all; USE ieee.std_logic_unsigned.all;. U4 @* c! v: j* U
ENTITY counter_60_seg_v IS: |0 z# f4 d$ s* I- j5 K
PORT(Clrn,Load,Ena,Clk : IN STD_LOGIC;% @. C/ D( w) i' H
D0,D1 : IN STD_LOGIC_VECTOR(3 downto 0);
4 h% T8 C2 J! q' [ Q0,Q1 : OUT STD_LOGIC_VECTOR(3 downto 0);
( Q, i; F6 |( s3 C Co : OUT STD_LOGIC);
4 f, _! x: u" \" B3 ?0 UEND counter_60_seg_v;
! }* a J2 Z4 f; K2 KARCHITECTURE arc OF counter_60_seg_v IS
0 Y, ^, m- r1 F" {" g' e: n- k% j BEGIN
6 f8 U9 @ f( D" X1 d+ V2 P PROCESS (Clk)
. ?3 ~" Q9 Y0 A9 D VARIABLE imper0,imper1 :STD_LOGIC_VECTOR(3 downto 0);$ l' L0 Q1 m: B6 n" N8 s
BEGIN
1 C, g. N( a, y% Q) T IF Clrn='0' THEN imper1 := "0000"; imper0 := "0000";
3 g6 ?0 o9 N3 ~1 j# `+ Z6 q ELSE IF (Clk'event AND Clk='1') THEN
. e s4 @3 L3 m" r& `7 R4 w IF Load='0' THEN imper0 :=D0; imper1:=D1;
3 K* }5 q& j9 h# q! f) @; q, O ELSIF Ena='1' THEN
( k2 M) M# G f IF imper0="1000" AND imper1="0101" THEN
0 }% m2 B# `* ]1 [/ ~ imper0:="1001";8 p) M3 B) |, A& @, l
ELSIF imper0<"1001" THEN imper0 := imper0+1;3 H" \ w3 X2 q7 v' C
ELSE imper0:="0000";
/ c4 ~$ J( t" ?8 Q( Q5 v$ z W8 W IF imper1<"0101" THEN imper1:= imper1+1;' Z) F# s2 }, Q# K
ELSE imper1:="0000";
& c* G. U! Y V9 R8 X8 E END IF;
9 N5 j3 d: w: |" j END IF;
! _* J* g7 w7 l ?- s" L* r END IF;) N2 P3 p& f7 ^1 L
END IF;
8 g$ K' q0 h. l% {1 g$ |. y END IF;
d- ?/ ]% A6 t* ~9 A Co<=imper0(0)and imper0(3)and imper1(0)and imper1(2)and Ena;
+ p( u3 C" _4 W8 k, I3 v3 H* Y Q0 <= imper0; Q1 <= imper1; 0 x: _7 ]* @7 p; ]9 k4 h; ~
END PROCESS ;
8 E+ t3 r& {, N2 x9 CEND arc;
% A$ e0 M' T S- u2 ~! x# i( D s7 j& R3 S
這個是60模計數器設計9 h+ b! V; S. I5 w1 w! B
要怎弄成倒數60?
7 M1 |) f' n5 X- P' \3 F有人會用成倒數60秒先幫忙吧! `5 t7 c' E+ i9 U' W
請問一下我會用到幾對幾的多工器啊 |
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