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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
5 [$ H1 M& d, v" B8 z! b fmodule reciprocal_counter_96_11_29 () H* Y% d- g4 z c4 u2 U
clk,
% h2 h7 A; q: U' ` reset,. m+ C* b. Y$ T, g/ N
min_1,
$ P8 h" b* \ h& E9 c min_5,
$ D+ n6 o9 L# H( { min_10,5 H% w$ ]! Y3 h" X( B
start,7 r; E* F$ `; _1 G* x5 {* ^
reset_ext,+ Y+ f; `2 g3 _/ ]% L/ p
ok2 `3 S! m2 T& ], H) Y$ Z% o3 u, M
//外部腳位定義-------------------------------------
$ O; c. K# U, `5 Y+ ~- yinput clk , reset ; //系統 clk reset* J4 ], T( }& L4 t
input 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
5 _ x: v' ^6 j5 ?- O' F2 j; W4 |- Sinput start; //開始倒數鍵8 r$ @( ]9 \ _8 `6 H" T
input reset_ext; //強制歸零並停止倒數$ q ^* m. i% j1 P
input ok; //用來關掉alarm鬧鈴
3 t4 P! O, [% r% m//宣告內部暫存器---------------------------------------
- e* Z$ o7 Z% t( z) zwire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5- k; i$ ~" \) q% ^- d( C+ u( S
// min_10 , start , reset_ext為連接線 |) |- @* q; k& U& w/ i
reg [9:0]counter; //宣告counter為暫存器* `2 q/ H# z) x& l |
reg min_1_b; //宣告min_1_b為暫存器
- l- g' Z% h: }( l, Qreg min_1_bb; //宣告min_1_bb為暫存器' F+ N/ Y% K+ w* p+ g9 I
wire pulse_1; //宣告pulse_1為連接線 9 ]! O/ {; o8 l
reg min_5_b; //宣告min_5_b為暫存器8 \" s# K2 M( Z( E) Y5 Y
reg min_5_bb; //宣告min_5_bb為暫存器
' l. u" {9 E. S R8 E% W. Bwire pulse_5; //宣告pulse_5為連接線
e! e( p# V, b B: y* treg min_10_b; //宣告min_10_bb為暫存器
% C0 s: z" e' N% q# \reg min_10_bb; //宣告min_10_bb為暫存器 : ~/ a: t( h/ o! |9 g( q5 I1 R+ A
wire pulse_10; //宣告pulse_10為連接線
/ `7 R5 ]6 v( ^# D$ u7 vreg alarm; //宣告alarm為暫存器
; W3 |- L6 O% {# M% w4 K# Zreg ok_b; //關掉alarm鬧鈴的暫存器1 {) }2 J, {+ O* Z- A3 v/ ]- f6 V
reg ok_bb; //關掉alarm鬧鈴的暫存器! b, q9 l+ I j3 r# r9 e E6 X+ n
wire pulse_ok; //關掉alarm鬧鈴的訊號
8 L2 J A/ E; q$ Lreg reset_ext_b; //關掉外部歸零的暫存器
9 s# E: V+ y/ ]! Zreg reset_ext_bb; //關掉外部歸零的暫存器
1 i! {- I% Z; ewire pulse_reset_ext; //關掉外部歸零的訊號
$ q- W7 _- Y* Wreg count_d ; //宣告啟動alarm用
! w( B9 @! \* _0 C; U1 ^reg count_dd ; //宣告啟動alarm用6 S: P# q- F- D8 Z, Z, V
wire pulse_d ; //宣告啟動alarm用
" I2 h1 |7 j( m& B5 }# i. l& ]reg [7:0]led ;
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assign pulse_1 = min_1_b & ~min_1_bb;
! e" V" y: j! ]assign pulse_5 = min_5_b & ~min_5_bb;
* r3 `9 D" e4 G/ b+ gassign pulse_10 = min_10_b & ~min_10_bb;
6 y- a7 i A- \+ \# k* fassign pulse_d = count_d & ~count_dd ;
/ l, I! ` ]0 g9 h. bassign pulse_ok = ok_b & ~ok_bb;% s) N$ f. M4 H6 }: V
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb; K t5 A; n) {1 ^! }( m5 ^9 a
//-----------------------------------------------------
' v7 u* l0 Y" b" x% w0 G//計數跟倒數" V+ u% c; K" G
//-----------------------------------------------------
" {7 O5 G4 C$ A0 K/ ^) ualways @ (posedge clk or negedge reset)" v$ i9 @+ z, L; U- e& T
begin
4 M& {# n/ T$ G if(~reset)1 c% V7 {( i6 {' F; t+ G
counter <= 0; //把counter 設初始值為零
1 _: L% J* ?/ Q else if(pulse_1) //
0 W' e! |& X' F% s counter <= counter + 1; //
* h! V' I( S" b) d# {/ x" x; s else if(pulse_5) //設定counter按1 and 5 and 10的累加) Q! Q2 ^6 W0 z8 `
counter <= counter + 5; //
$ U: q% @4 O. `# ]; C1 y else if(pulse_10) //
0 ?* B) d7 a/ v) [% \$ X& K) j" h counter <= counter + 10; //
- c T: l1 Z/ S& m7 J+ P1 p+ i8 s: u6 ^ else if(counter >0 & start) //設定counter開始倒數6 |/ t F2 s5 w" |+ J) @4 S
counter <= counter - 1 ; // 0 s4 o8 V5 b+ U. ^
else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作4 s1 T' y! ?4 h3 T3 O+ P
counter <= 0 ; 9 y$ J! v K3 Q6 J! m4 g" n
end
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//------------------------------------------------------
8 f2 j& `5 V* w/ Q//led_counter
2 n% M# C9 u/ s! m3 G" W: f/ Z' K6 k+ H& V//------------------------------------------------------+ R6 z0 t" u6 ~ j6 K' x
$ A5 B( D' J/ y! T* `
5 V E$ X$ O& s+ O/ ~7 g; ?
( D' m- J. S a' r( n
, _) s' `( V. F( ~/ z//-------------------------------------------------------
7 h9 P, q5 s; W c$ q1 j//alarm鬧鈴. P8 H- j/ A9 |1 S0 Z/ j
//------------------------------------------------------0 r7 q% w5 S. R1 m9 U" d- `
always @ (posedge clk or negedge reset )
{. I* M" q5 [* {: Q) bbegin' K& J+ `1 o; f S/ k) ^
if(~reset)/ I3 r4 r. e3 D5 g& A9 g9 U
alarm <= 0 ; //設定alarm鬧鈴初始值為零8 f( L6 T9 a0 Q, D5 C* m2 I3 K- x
else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴4 O# ~/ J d- S0 l- f
alarm <= 0 ; //# u+ S# U% T; L" o; S' ^" ~
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起
$ R, B. D# T/ L H! C6 l( } alarm <= 1 ; $ ?5 q o; t7 u) V4 u
end 8 d/ ]3 A4 W1 o8 ^2 q) S+ M6 E
//-----------------------------------------------------/ I% I @9 @9 w# C. @ G
//count_d5 J; B2 j5 l( y, x! r& F
//----------------------------------------------------" u( e* |: |" {; L
always @ (posedge clk or negedge reset)
r+ ^1 X( T% a( xbegin
1 q( f+ y% h N+ c! h5 t- | if(~reset)
7 I: M) A9 V9 K! ~! M" {# M# n count_d <= 0;
5 }# Z( ^1 I, O0 f0 A. u; v else if(start & counter == 2) , z- n" J* M; G, B# h- B6 [) Z
count_d <= 1 ;
% q2 V; @- S9 c6 j. M// else if(pulse_reset_ext)" E' `1 l, I3 S7 y
else6 L0 g1 h, [% A' S4 s
count_d <= 0;2 E- c6 o a" M4 m3 [; H/ {) g9 ]
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* h2 |& c% d, x3 Y0 J( u; Tend
: K+ B3 K3 t+ i( {; j//--------------------------------------------------------------5 C$ q: s) C# m& F# d$ D
//count_dd
, c5 z' j3 D! y3 W" m& N//--------------------------------------------------------------
6 {' s4 A" J1 V. E& q6 t. f9 Galways @ (posedge clk or negedge reset)
$ `+ q1 |' ^. \6 bbegin
! Q/ z- G0 v0 p if(~reset)
5 q" {9 h0 Q$ C$ B2 {- ~2 x count_dd <= 0 ;/ z) T4 ?! I2 C. u
else if (start & counter == 1)
8 t' d9 i; t$ i! e3 U count_dd <= count_d ;
% p; |/ A; d% j) ]& n// else if(pulse_reset_ext)
# p: ]/ @/ x6 d/ k else
+ t# q/ {8 R( N- U* Y count_dd <= 0;
, _% p4 a6 b! w- H% ` . w B1 M( s9 b! F* T
end
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