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發表於 2007-11-29 13:32:01
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這是小弟寫的倒數器
`timescale 1ns/1ns
n# ?# W: O; A# I8 {/ [module reciprocal_counter_96_11_29 (9 U- G! L! O8 N/ B& T/ z _4 z8 ~5 a
clk,
6 w' ]% B/ O! O) Q6 L5 E reset,
: q7 C' [* j. w. e min_1,
% b6 m" h, P* e0 s3 j; ^- H+ P min_5,
+ j- O+ ]8 E4 h: L, y, G min_10,
$ n( r9 y5 A: P' Y) e start,
. K; I( K0 e# |4 H. l reset_ext,
- R4 L# f. p9 i( ^" A/ z* a2 q ok
" B5 N* t8 N1 U) _8 U# }//外部腳位定義-------------------------------------
4 N5 {& B( L8 J: D1 _" ], L% Zinput clk , reset ; //系統 clk reset
0 ]) i- p2 a- Y# H7 kinput min_1 , min_5 , min_10; //設定每按一次1加1按5加一次5按10加一次10
9 F- X. Q- V7 w9 p5 z. ]/ B" u# linput start; //開始倒數鍵( K6 i. Q+ p: X, ], n, m
input reset_ext; //強制歸零並停止倒數
0 [: |4 ]5 E: i9 {/ Sinput ok; //用來關掉alarm鬧鈴 ! O4 Z* T, H w) v
//宣告內部暫存器---------------------------------------
7 z( v& _" o; S* M4 nwire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
! l2 S# ^! v' G1 z- m5 b; H* y // min_10 , start , reset_ext為連接線
# J3 B7 A* V5 Creg [9:0]counter; //宣告counter為暫存器7 Z1 v/ f! q6 t \
reg min_1_b; //宣告min_1_b為暫存器. P2 h9 }/ G1 m" f: T
reg min_1_bb; //宣告min_1_bb為暫存器
7 |" n8 p5 U8 L1 D+ A) m; `/ I% swire pulse_1; //宣告pulse_1為連接線 - U1 G; X2 W+ {7 s
reg min_5_b; //宣告min_5_b為暫存器* N' L1 s/ `" I* k! y
reg min_5_bb; //宣告min_5_bb為暫存器 9 ]* A9 u ^8 l) W
wire pulse_5; //宣告pulse_5為連接線
0 I3 ^' E, }2 t/ Z; Hreg min_10_b; //宣告min_10_bb為暫存器 9 P1 a( j0 Z7 a& x4 ^) u0 g
reg min_10_bb; //宣告min_10_bb為暫存器
3 A8 X! f+ T+ Fwire pulse_10; //宣告pulse_10為連接線 , j/ v1 F6 f! v7 m7 C& t) Y
reg alarm; //宣告alarm為暫存器
+ C% b3 {5 J) areg ok_b; //關掉alarm鬧鈴的暫存器
$ H, i& |# ^/ b% A& A- m1 yreg ok_bb; //關掉alarm鬧鈴的暫存器& S2 F4 d. E+ B4 V: e$ Q% u7 i+ a* e
wire pulse_ok; //關掉alarm鬧鈴的訊號
2 _' y) ^5 h5 O) oreg reset_ext_b; //關掉外部歸零的暫存器
2 ^' y V4 D: k6 ]+ a( w, Y/ m; Lreg reset_ext_bb; //關掉外部歸零的暫存器
7 Z9 t% Q- ]2 C, i" bwire pulse_reset_ext; //關掉外部歸零的訊號; c' ~1 ~: M6 W! n3 ]( h
reg count_d ; //宣告啟動alarm用
`, V3 p6 ]# n$ W- a+ v& Dreg count_dd ; //宣告啟動alarm用 O! A Z& l+ }% C
wire pulse_d ; //宣告啟動alarm用
$ v9 E7 a& b* ~% w, ~8 yreg [7:0]led ;
3 V- x/ ?3 M2 R9 ?3 \" t
4 W% V+ {8 ^* L" yassign pulse_1 = min_1_b & ~min_1_bb;
# D1 u( }' j. B1 K1 Xassign pulse_5 = min_5_b & ~min_5_bb;
, s- S& h1 D7 ]' H9 uassign pulse_10 = min_10_b & ~min_10_bb;3 J' F# y# P, _! j* r
assign pulse_d = count_d & ~count_dd ;2 U1 v w# e X/ q v/ n' T r
assign pulse_ok = ok_b & ~ok_bb;" d, p( \, w. l0 ^% o1 e
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb; M3 L; T* W& y" V* u I
//-----------------------------------------------------! J8 v# V) } J1 |4 x6 |
//計數跟倒數$ H) }& l. t% _0 ?- d/ h
//-----------------------------------------------------
3 O* v6 W% u7 Q \: B. o& Calways @ (posedge clk or negedge reset)
) t6 P8 c: h8 Z& p* wbegin( K2 G- W" F1 U) _- C
if(~reset)( ^6 K+ ~( c3 u8 g1 s
counter <= 0; //把counter 設初始值為零
+ Y4 X* ~, @- ^% e2 A else if(pulse_1) //# f" D6 E2 M% z7 h: |8 [$ u
counter <= counter + 1; //- r4 }3 W4 X; a" _6 l9 n8 y# ? S
else if(pulse_5) //設定counter按1 and 5 and 10的累加
8 T7 h; N- K3 l1 d/ e counter <= counter + 5; //
4 t9 w; y( g3 ~8 ]9 q5 { else if(pulse_10) //' [* e7 w) ^2 G" i
counter <= counter + 10; //! \, o8 Q/ E3 d+ u
else if(counter >0 & start) //設定counter開始倒數
3 P6 k @. m2 p' R% p counter <= counter - 1 ; // 3 J* N. T9 d" X* G9 B- r/ a
else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作
. |0 s) D) g7 V counter <= 0 ; 7 M# g9 p- D X' ~
end! Y% b- q! u8 k
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. T5 q! L V) f3 T Z% P
//------------------------------------------------------4 U( Y' F: n* c
//led_counter
9 P" r4 Q. C; D6 p3 ?/ t# F4 U3 T//------------------------------------------------------, `4 h8 J. l+ [1 I
, w5 F3 }4 y/ r# k% e( C& C6 S+ y4 t: R7 o8 s
+ P# O/ W, l: i" E$ n/ x
$ k7 l! S1 o3 q//-------------------------------------------------------
9 B- V. u3 e) W4 ^9 \* G2 Q6 |* k! ]//alarm鬧鈴0 J, E$ ~- P/ Y/ x) K
//------------------------------------------------------. F- {' w/ p9 V# e( H
always @ (posedge clk or negedge reset )
# { C, D" z: t5 ]* l! Qbegin1 J5 K+ c" w- v. W
if(~reset)
8 x4 ]5 D6 q. F: [/ \ alarm <= 0 ; //設定alarm鬧鈴初始值為零- J2 Y% A: |6 Y
else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴% V9 E" I- Y" G) x$ E' K
alarm <= 0 ; //& W; @2 P* _5 v/ `& ?& U* V
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起) ?5 ~; N+ c7 m
alarm <= 1 ;
/ ]( S6 E0 [6 m6 Rend % `! E9 v. L' j
//-----------------------------------------------------
% K9 M U/ k8 {0 P: W+ }8 W- Z//count_d9 J# p) [$ X0 y4 j
//----------------------------------------------------
1 y) m+ B7 @% c+ ]2 w3 u% [+ I oalways @ (posedge clk or negedge reset) ! o, Q! P3 M n/ y% d3 L
begin: }4 R" U; x1 a
if(~reset)5 E: y& B9 u2 e9 a f8 W6 i& P j1 [
count_d <= 0;8 `, h. y& R* ]6 B6 @
else if(start & counter == 2) * n3 f& z6 {5 S/ b3 q
count_d <= 1 ;
5 @. T; m: @' b; `1 k- [// else if(pulse_reset_ext)- t+ k1 B5 t3 z7 u1 V' u
else) Z- Q2 K) h) y) S( C( ] S
count_d <= 0;
/ E: P$ W) Q+ a
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end
+ h V8 p, h6 N//--------------------------------------------------------------2 l" v- A; y2 a n6 y2 P! c
//count_dd k3 b9 J4 w! v; e9 i; a! H" e: N
//--------------------------------------------------------------5 B) p! B6 I; k. {, {
always @ (posedge clk or negedge reset) + V4 c2 d4 o( }9 K. t: M; j
begin, U, c# Y ^6 r. E% f
if(~reset)3 y. u- c3 I' X
count_dd <= 0 ;
/ A; j( T' D. {- Q5 c( p else if (start & counter == 1)) V( }8 m% v% j& Y+ ^( U3 t4 ]' |
count_dd <= count_d ;. j* p x% l, w$ }- U3 Y
// else if(pulse_reset_ext)
' p% k0 G G) o# w( K, A# D5 { else
2 u" l, A9 G( L7 N3 c& e count_dd <= 0;
9 N, h; ~- ?9 P. m' q; R2 Y% d ?; P4 C9 L: Q2 \( z; C# ` R6 X
end M% ]1 U& M) I8 r* x' a O, n
: H( Z: S$ C. B: ] W% }
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