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2#
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發表於 2007-11-29 13:32:01
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只看該作者
這是小弟寫的倒數器
`timescale 1ns/1ns
$ h% a' g& n5 Bmodule reciprocal_counter_96_11_29 (
- z7 `, Z/ w# p, D' j3 m5 }3 b: A, a clk,
+ z2 y- g/ n; H9 Z; R reset,5 F9 ^5 K ^5 K5 W+ ^
min_1,
* n( K0 O, U. `# C( h min_5,
+ q8 ?3 } E& i; F( O6 A" R min_10,9 T6 |! e+ B1 J
start,$ l5 a+ u) A; w
reset_ext,+ Q4 K) _8 M2 I
ok
" M* i* |6 T& F. J+ q//外部腳位定義-------------------------------------: m2 M& m/ s% C0 |
input clk , reset ; //系統 clk reset
: Y* q! H( x) R. Uinput 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- C9 `; I: W9 j
input start; //開始倒數鍵
0 r8 [: `+ D( \" P: P! f/ qinput reset_ext; //強制歸零並停止倒數
_7 n, M& W$ f. z' Ainput ok; //用來關掉alarm鬧鈴
2 `. H$ d9 `: U) w7 n( d//宣告內部暫存器---------------------------------------
8 M/ e1 g8 U6 w% B9 K/ \; pwire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
# k8 k0 T. o1 l1 k L- @3 i; R& h% q // min_10 , start , reset_ext為連接線6 f5 V/ a2 a: o# @4 y
reg [9:0]counter; //宣告counter為暫存器! W3 f: H$ M4 u; V! \
reg min_1_b; //宣告min_1_b為暫存器
" r8 v9 r0 x9 j5 {9 g; Preg min_1_bb; //宣告min_1_bb為暫存器0 R% _4 S5 O) ?1 m( q8 g$ h
wire pulse_1; //宣告pulse_1為連接線 / U0 C0 T4 d- t4 L3 r1 S; b
reg min_5_b; //宣告min_5_b為暫存器2 T, z# i; m+ p8 Q7 O
reg min_5_bb; //宣告min_5_bb為暫存器
8 f$ @5 M, d1 W2 W" Owire pulse_5; //宣告pulse_5為連接線
& a; J% a; `2 A, v8 |& }# N* ~reg min_10_b; //宣告min_10_bb為暫存器 " V" C# h* f5 ]( ]# @: ^7 n
reg min_10_bb; //宣告min_10_bb為暫存器 ! U0 g+ K. P+ o+ E; l. e8 T: X! }
wire pulse_10; //宣告pulse_10為連接線
$ V# Z5 S: f0 p. A( ~; Xreg alarm; //宣告alarm為暫存器 # j7 L. _( T" ~ V' X' {+ |
reg ok_b; //關掉alarm鬧鈴的暫存器0 L1 z, N7 r5 K2 P4 |# w, M, K N
reg ok_bb; //關掉alarm鬧鈴的暫存器4 p9 o/ _9 x4 E& W1 y. I$ r4 G' N# V
wire pulse_ok; //關掉alarm鬧鈴的訊號9 Y1 H, U$ ^! M P; O
reg reset_ext_b; //關掉外部歸零的暫存器9 L6 L8 |; s3 U# ^ T! r0 ~+ t) v
reg reset_ext_bb; //關掉外部歸零的暫存器0 ^; k& {, }: K' l* K
wire pulse_reset_ext; //關掉外部歸零的訊號
9 r+ E& N/ K) h" _* m6 t( H1 Oreg count_d ; //宣告啟動alarm用( Q6 p) M4 \* v" E+ z
reg count_dd ; //宣告啟動alarm用4 l" }7 L( \1 }
wire pulse_d ; //宣告啟動alarm用) K& b+ a0 ^, M/ T, T2 l& q7 A4 O
reg [7:0]led ;
# Z4 @1 F# c# d' Z5 M% Q0 s$ V3 \! {* o8 x) c1 y Y
assign pulse_1 = min_1_b & ~min_1_bb;* a6 e d3 ]+ @/ o0 K9 D. P
assign pulse_5 = min_5_b & ~min_5_bb;+ L# E5 `/ F' o6 e8 V U( P( ~, U% x
assign pulse_10 = min_10_b & ~min_10_bb;" B* z$ B. z" z5 U
assign pulse_d = count_d & ~count_dd ;8 q& ~9 \' }3 p- V* a
assign pulse_ok = ok_b & ~ok_bb;; ^2 w" i8 N! {/ \! \0 T
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;# D4 G# L0 ~0 K m
//-----------------------------------------------------
1 [4 Q& B0 X4 q \2 x6 i//計數跟倒數- |/ |7 S7 ]! ]6 w- R7 M
//-----------------------------------------------------
6 f- F$ W) G4 N7 P f. halways @ (posedge clk or negedge reset)
5 D& W) ^) P+ p$ v$ S/ V$ rbegin8 R( r5 s% T+ m- u' _+ ]
if(~reset)% ?( M1 D. O6 k. h
counter <= 0; //把counter 設初始值為零
1 z4 Z; W! a2 G& `( W5 N else if(pulse_1) //
& H. G7 M! I, c, ]+ F* g0 C) P3 o3 Y counter <= counter + 1; //
& D+ r* y! }% O else if(pulse_5) //設定counter按1 and 5 and 10的累加/ x: A# Z0 j- i
counter <= counter + 5; //
. j# |, D6 |$ M z3 {/ n+ X else if(pulse_10) //
, P8 y$ E' T J5 M7 \ counter <= counter + 10; //% j% i/ J+ a- x j! k5 u4 ]
else if(counter >0 & start) //設定counter開始倒數
4 b$ _6 w7 z9 W: x counter <= counter - 1 ; //
7 @) |, z5 ?3 u' ?* l* _ else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作1 Y3 {; ]% ^4 i# z
counter <= 0 ; . x3 a. T. w8 f
end
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) V: E/ b) @" \3 {: r
8 |- f/ C( v7 w6 h
5 k/ N" w3 N' X* L5 X0 @//------------------------------------------------------- [! o# x+ u4 q1 f" c) O; l, \
//led_counter
# s6 j! G4 m# V//------------------------------------------------------
+ M! h: G p. ~/ {, t, j' H+ D/ q! S6 `
, w- z3 x2 ~; c- b* ?( ~
W5 z6 X. Y6 S, N& W5 O5 V1 v5 l
) B- A e0 I8 U7 {; T6 J' U//-------------------------------------------------------- V4 h/ P. h$ z# I
//alarm鬧鈴
/ Z6 L! \' D* ]. k//------------------------------------------------------: S) B' _5 L0 f9 B% l8 ]; Q
always @ (posedge clk or negedge reset )
+ N4 o# r4 C6 k5 F" r6 K4 U" Ubegin" L* n# o) S9 i' Q- z
if(~reset)
6 U( K# L/ I9 Z# {9 y6 s) T. } alarm <= 0 ; //設定alarm鬧鈴初始值為零& K# H, Y; ?0 L+ X1 m
else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴% e2 B' e; E6 W/ F+ [9 \, C5 I
alarm <= 0 ; //
7 y6 y, n& }/ T8 J else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起 u% q8 ^1 F; U& s7 a; ^: O
alarm <= 1 ; 2 k8 L+ W- p0 z
end
- w* S* T. w! g7 }3 [//-----------------------------------------------------
9 s; W1 m1 E+ ?" m! K//count_d
1 }; p" `, v3 S//----------------------------------------------------
5 o+ \) L( n6 R& Z5 valways @ (posedge clk or negedge reset) ( m; k% b+ ^0 c. s$ T
begin) G: a- c; G& q$ {$ o% M* k
if(~reset)
. K' n0 h7 }4 T) n4 P1 F count_d <= 0;
) `; R; V/ G3 T& l) o6 Y else if(start & counter == 2)
+ R, u: w$ n+ S: n( k; d4 Q count_d <= 1 ;6 {8 r# n/ _* f3 o* W1 d m& ?
// else if(pulse_reset_ext)
2 z, _6 \' O$ S* p& d0 D+ P else
- z4 ]) {' Y0 I, P$ S8 y* ` count_d <= 0;
/ ?! `0 q+ Z6 U+ n6 V. c, T ' E8 L3 q' v: H6 C" @/ D
, {# ~ R( p' S
9 N$ L) R: ^3 V8 T* n& j' |
end
2 `' [2 E$ A( M$ T' f2 {( n2 }//--------------------------------------------------------------
: v$ _& \4 r) {4 m, ^ o) P- G//count_dd( _: j9 o4 p/ o2 e$ r& G) P
//--------------------------------------------------------------
( ^: R+ t+ k7 Z1 |% w4 t$ Oalways @ (posedge clk or negedge reset) 7 D: k) Z. u, }/ p! q
begin- j: R# u* g2 l! S, X1 n3 T7 b
if(~reset)
3 c5 s- E/ u: p3 q; \ count_dd <= 0 ;1 Z( ?, f- B% [6 x* k
else if (start & counter == 1)2 y) o6 i `# L) A$ }- T0 |9 {' T
count_dd <= count_d ;
' y8 w1 d( f+ a; ~6 g: j3 s* c// else if(pulse_reset_ext)$ h" e4 W2 @; G
else ' w/ D0 m2 w% ?( Y; M
count_dd <= 0; 3 y! T$ F' u/ I! E& t/ H
/ a [; T& Y% a( ^end. z$ m9 X8 f$ w, j& f% `3 N& v
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