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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/1ns9 C1 X5 D8 Z: m
module reciprocal_counter_96_11_29 (
6 p: b( _) e: p6 f$ N' A( v5 u clk,/ O* q+ d4 @6 \0 P- z; J
reset,( K: v* p( B1 v i1 [
min_1,
) e; S% Y. ?. m4 l! G% U min_5,
5 ]# X9 m8 `/ o5 `, [ min_10,
1 l6 N2 y4 D! s6 j start,1 {) d l, i- e2 K W9 t& p: C
reset_ext,
2 N" b0 ?9 k( Y/ s' O ok% w% R) e( L; {' ^1 F+ K
//外部腳位定義-------------------------------------8 P& ^1 n- _* |9 s( k2 D
input clk , reset ; //系統 clk reset# q6 W( z+ D" v$ Z
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
, ]# h, ~0 P3 K" Winput start; //開始倒數鍵( W0 s; s: G8 o1 X. m
input reset_ext; //強制歸零並停止倒數7 o W {# {+ O7 B& ~- _
input ok; //用來關掉alarm鬧鈴
" @) G! V7 ]& w7 R# Y: k; K$ V//宣告內部暫存器---------------------------------------) q: v" X3 l8 w3 `6 O7 n2 \* o
wire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5 A2 v) ~1 ^3 _8 M" }0 d/ g/ u) F* e
// min_10 , start , reset_ext為連接線
3 G) }3 M% C8 V" Sreg [9:0]counter; //宣告counter為暫存器& j$ v5 e5 ]4 T6 ^; G0 f5 o
reg min_1_b; //宣告min_1_b為暫存器
& b5 i; y; R+ R. Creg min_1_bb; //宣告min_1_bb為暫存器
. \# u3 ?; F% n8 M1 Q; s' g, xwire pulse_1; //宣告pulse_1為連接線
+ \$ \+ d; B k& Breg min_5_b; //宣告min_5_b為暫存器+ M; Z: ^1 E/ d2 w
reg min_5_bb; //宣告min_5_bb為暫存器 , m# n! q) [2 k# l0 V1 h- d& S
wire pulse_5; //宣告pulse_5為連接線 5 L+ ~$ o5 K% j9 X
reg min_10_b; //宣告min_10_bb為暫存器 * t' @, ^" O! ]/ l, j8 m0 { ]
reg min_10_bb; //宣告min_10_bb為暫存器
( G9 V, W4 T6 H+ z) |# I* ~% n T2 \wire pulse_10; //宣告pulse_10為連接線 3 n4 }3 v" \: u7 c y
reg alarm; //宣告alarm為暫存器
7 }0 a4 P; m; K$ Vreg ok_b; //關掉alarm鬧鈴的暫存器) c+ Q9 b" h& Z1 M! B
reg ok_bb; //關掉alarm鬧鈴的暫存器
; M1 ?# L1 Z" P" j# v8 {& w1 Wwire pulse_ok; //關掉alarm鬧鈴的訊號
4 L5 t; i5 W: U5 o2 `: l6 ]reg reset_ext_b; //關掉外部歸零的暫存器9 K9 `- R! g* j( U* M' t5 u$ R# |- o
reg reset_ext_bb; //關掉外部歸零的暫存器
. P1 n! g8 j5 T1 P, m6 t! ]wire pulse_reset_ext; //關掉外部歸零的訊號' r7 k3 |+ X) _$ w1 W4 I+ I
reg count_d ; //宣告啟動alarm用
7 K3 |; X0 X8 R- _* Z1 L2 E6 _reg count_dd ; //宣告啟動alarm用! z3 u& y5 c9 b; [% ]
wire pulse_d ; //宣告啟動alarm用
) @& U x: o8 o0 T% Z, Mreg [7:0]led ;- ?# X% C% T! T0 T3 H$ K
# B2 ]9 }9 n' i; ?8 n4 Dassign pulse_1 = min_1_b & ~min_1_bb;
0 _) [7 Z' J9 R+ a! K Wassign pulse_5 = min_5_b & ~min_5_bb;
D i, V; A/ w. Y! p& E/ I9 vassign pulse_10 = min_10_b & ~min_10_bb;- {6 v9 \8 U5 I) Z: |
assign pulse_d = count_d & ~count_dd ;6 \' ^5 L* q0 V1 @
assign pulse_ok = ok_b & ~ok_bb; F( z( ]; E: x5 W9 s' Y% g
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;
+ Q/ X9 D& n, j! Q//-----------------------------------------------------5 ]( ?7 e a4 C
//計數跟倒數2 e5 n- t2 a' \7 M, @' q1 u
//-----------------------------------------------------
3 k- z& l9 M, P* X/ M+ |always @ (posedge clk or negedge reset); B& _8 I& t" P: V, [: r
begin1 L% g5 W2 S- y
if(~reset), G9 f5 X3 e1 _ `2 }$ |( f; h
counter <= 0; //把counter 設初始值為零
% a2 u& l$ K \ else if(pulse_1) //& L) V2 V: R. U& d A" c
counter <= counter + 1; //
( {- S: W, g$ Z& v% X- e9 y5 Z, R else if(pulse_5) //設定counter按1 and 5 and 10的累加- t5 r; S& t( e l) G
counter <= counter + 5; //
7 q& Z% F+ g6 L, Y else if(pulse_10) //
- o' e0 `; K" d& T/ ^ counter <= counter + 10; //2 G4 T3 M& N2 P8 \- l
else if(counter >0 & start) //設定counter開始倒數+ b! I: m% X1 ~ _# w4 a& d
counter <= counter - 1 ; //
% N( j8 e7 C1 L3 N" D else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作% J! A' ?3 u' a9 t
counter <= 0 ; : {6 A* t4 }% D+ f. e2 i+ V
end" |% g8 l: p x; m
; \; j/ p3 b$ \0 y: Q; `, s# R$ b2 g
& d n# ^, K6 G' _* W* Y( n+ Y
//------------------------------------------------------
1 u G% G3 C+ b" c& ?( g: I- { W//led_counter/ i t L s9 g: F( {' l
//------------------------------------------------------9 s, }, y, W5 p) o9 c6 ?; u) l
& @3 g6 T* r; v1 c
/ P; }8 ]; U* Y
& [4 S: z2 U; k7 m6 Q4 j/ n. Z* {* P) s/ ]% Y
//-------------------------------------------------------
" [$ o, ]- |+ Z: L1 n# x8 ^& N//alarm鬧鈴; a2 C5 r5 {8 f6 i
//------------------------------------------------------
* a0 t! P5 \8 ealways @ (posedge clk or negedge reset )0 G. i3 B" _+ ?
begin
) Q# U- x! c% U9 c* a( I* J, P- v, }9 I if(~reset)
# `, X( Z9 K% ]* N+ J alarm <= 0 ; //設定alarm鬧鈴初始值為零
3 |: y8 q E: x* p5 W1 B. P4 J else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴
" B4 Y$ j1 k4 n alarm <= 0 ; //$ ?# r; l7 R3 c2 p
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起
/ s9 \* r% u# O. p+ u alarm <= 1 ; , y. e; s0 h4 J& Y# y$ P8 O
end
6 J3 u1 l# M- I- B//-----------------------------------------------------* ^: l: o& S- H6 c. M$ ^
//count_d
% \8 j1 n0 n/ b3 I5 j//----------------------------------------------------! m4 l* V$ Q5 q
always @ (posedge clk or negedge reset)
3 ]6 a; j: V l% e1 Bbegin* U9 z& ^! y+ k
if(~reset)
0 e X7 Z, b* n count_d <= 0;
J* y% {" A; t) N9 |+ r else if(start & counter == 2) 3 C* r, B: p/ y4 y3 n+ {8 y
count_d <= 1 ;
, M. D x( w- P+ K5 E' g// else if(pulse_reset_ext) F' m. D* r" \
else/ ?$ R7 A5 e7 r
count_d <= 0;5 H% ^" d6 ~2 t7 H$ k- p
4 Y6 d1 N$ |* E9 t( {8 l
6 p! b* t2 m& ]0 v; f8 W 3 z, U7 r8 i" @9 {6 t5 j; K; G2 [- `
end
) v7 i) H9 V" i9 T$ k//--------------------------------------------------------------
) G+ k4 _- a6 A( e8 q# P//count_dd
- }, {7 C) P4 u( l5 _//--------------------------------------------------------------8 |( k8 s7 v8 g- E
always @ (posedge clk or negedge reset) & E8 Y3 T2 V1 B) {& b- S0 U
begin j: D! j+ b6 O$ F
if(~reset)1 B$ @3 w! d t
count_dd <= 0 ;
/ M# m: W6 Z4 @ else if (start & counter == 1): r) y/ L8 i g# \
count_dd <= count_d ;1 w0 |, Q5 Z$ C7 g) m6 o
// else if(pulse_reset_ext)6 z0 M& H8 A+ P( q( o! O
else 9 a' c& t9 z9 i* x" `. i
count_dd <= 0;
( b7 E) p/ L4 j" N# ]/ r2 n6 D7 ?
& l8 e1 r/ I# r. w3 V7 O: L* Nend2 L+ i5 ^0 n4 s# b
8 w3 H% u0 F' i) G7 U5 o9 [- Q
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