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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/1ns4 @, r* q( p1 N5 i e4 L+ F. d- z. q
module reciprocal_counter_96_11_29 (
W/ G! i3 E% u& H1 ]) q clk,4 R/ ` j! I- ^2 g
reset,0 E. o% D* e& `* |. N4 r
min_1,
1 M! L& j* |$ [ min_5,
6 j, J6 j+ p1 Z& k- @ min_10,; M" G7 h) e6 x1 L+ _
start,
. O4 b. v( B1 ~9 ` reset_ext,' y5 \, y7 w3 _" j/ ^2 u: @) E
ok% r- P2 U0 }9 A$ W1 c1 \
//外部腳位定義-------------------------------------0 e" l+ Z$ ]7 v; g* U9 X6 [5 g- A
input clk , reset ; //系統 clk reset9 c% m% C" L3 p
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% Q Y- O* ~# w( s' n1 k# k! R
input start; //開始倒數鍵! n' ?3 D/ n: Z8 f2 h
input reset_ext; //強制歸零並停止倒數
3 f1 W8 h7 P9 W8 I. g" einput ok; //用來關掉alarm鬧鈴 6 Z d7 m! y [6 {
//宣告內部暫存器---------------------------------------
+ Z i3 A3 Q9 r7 w$ [" {wire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5# Z" u: O7 d: c
// min_10 , start , reset_ext為連接線
( h2 |3 [- d/ B% ]+ p! S7 sreg [9:0]counter; //宣告counter為暫存器3 t! u- p2 J6 ~1 s/ ]/ m, ^
reg min_1_b; //宣告min_1_b為暫存器
' y, l* P1 g( g N! W6 R$ ureg min_1_bb; //宣告min_1_bb為暫存器
, { F/ B; N0 G: Swire pulse_1; //宣告pulse_1為連接線 $ p+ l) y& m/ P* ~
reg min_5_b; //宣告min_5_b為暫存器
) P- X* V+ E( j. a( Greg min_5_bb; //宣告min_5_bb為暫存器 % g$ b* q/ w1 z
wire pulse_5; //宣告pulse_5為連接線 - B4 [! S5 ^, G- [
reg min_10_b; //宣告min_10_bb為暫存器
! D- n5 d$ q! _; v1 e& G, W7 M. zreg min_10_bb; //宣告min_10_bb為暫存器
, A3 S$ n& h5 hwire pulse_10; //宣告pulse_10為連接線
- R$ n1 T1 r+ @' |3 Z6 @0 f* oreg alarm; //宣告alarm為暫存器 9 {' I+ ~! p7 v2 W) \9 Q/ X
reg ok_b; //關掉alarm鬧鈴的暫存器6 I& C8 x# Z- D& n, [
reg ok_bb; //關掉alarm鬧鈴的暫存器
% t0 Z* Z( E# x: \" awire pulse_ok; //關掉alarm鬧鈴的訊號8 w' w8 E* o. f% i6 I+ i8 \
reg reset_ext_b; //關掉外部歸零的暫存器
' J+ A4 K% I0 I8 Z9 B+ Greg reset_ext_bb; //關掉外部歸零的暫存器; V$ A# S/ g4 s
wire pulse_reset_ext; //關掉外部歸零的訊號4 g) J, L' H- H* q( T8 Y
reg count_d ; //宣告啟動alarm用$ C. f a4 s1 A n4 Q/ l
reg count_dd ; //宣告啟動alarm用, t+ Y3 g4 Q' e' Q% U# J8 ^
wire pulse_d ; //宣告啟動alarm用
) u8 x! `7 N. |5 @+ R- j1 {reg [7:0]led ;
4 V+ C, ^, |% Q+ p" m0 s, K, o3 H/ @' w0 \
assign pulse_1 = min_1_b & ~min_1_bb; l9 l, f) n8 _3 C; ]2 N! g9 B3 d
assign pulse_5 = min_5_b & ~min_5_bb;& P; H+ `+ q- h" _" K
assign pulse_10 = min_10_b & ~min_10_bb;* O% r) ?& t) B, b- F, n+ ?8 J
assign pulse_d = count_d & ~count_dd ;) s' K* S! l+ L0 o8 s
assign pulse_ok = ok_b & ~ok_bb;6 u- s V8 e& u" ~/ ]3 y
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;/ t b- H8 a# X! `/ O
//-----------------------------------------------------% H3 p* g$ q m5 b" w' z' J
//計數跟倒數
2 R, G2 A2 } S* d1 Z//-----------------------------------------------------( t9 R( E3 x) M' L
always @ (posedge clk or negedge reset)
* D8 l. n. P5 C+ \: Pbegin/ I4 u' [- C4 L. c2 J3 C
if(~reset)0 ~' ~; g3 E3 ~% g& }
counter <= 0; //把counter 設初始值為零. _" P. V8 R' {, l. _0 z
else if(pulse_1) //$ u" o0 z7 t0 h- w% W
counter <= counter + 1; //
- X/ N$ Z3 x5 e$ j* ` else if(pulse_5) //設定counter按1 and 5 and 10的累加, Y9 i+ N2 G* A- g
counter <= counter + 5; //
) D; J! p- q. @ else if(pulse_10) //
t# w u- ?" d9 O' }! } counter <= counter + 10; //
" h/ F+ s+ T' m* Q; m1 Y- [ else if(counter >0 & start) //設定counter開始倒數! ~% R: w" W1 {9 v6 w
counter <= counter - 1 ; //
, N, b' K! a2 O else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作
, K9 A/ h0 q: U7 N) B6 B/ l9 C4 | counter <= 0 ; 4 @+ c1 w5 @$ W4 @8 |7 b3 c* A2 y7 Y
end
2 V1 s0 o+ Y# f& \+ t1 M
( i' i) r* c2 W2 M- T
& D5 [/ V1 ~' a/ x2 E/ f( N' \. l9 \ g
//------------------------------------------------------2 e3 j2 T0 b1 I9 V8 p: F
//led_counter
! x, s2 i% t- a7 }7 G: K//------------------------------------------------------
0 B# N8 {8 V, v: ~* b2 @
4 k3 w) C8 `' b2 ^7 r
) j7 S+ j' W% p W9 b0 p- Q- U8 w9 T( [1 V3 j+ k' T8 R
; ]3 t6 R" l, m% T) ^//-------------------------------------------------------7 e/ V) M6 }: D5 P0 h
//alarm鬧鈴
. l' P0 J3 U2 G9 X//------------------------------------------------------, |6 s( X( F) Z3 Z. X8 S- M L9 v( u
always @ (posedge clk or negedge reset )
" w: C3 v) s( w: A5 R4 nbegin" B1 X# W, a5 w+ o, r D
if(~reset) P) d, X- d( g& l. _" \. q7 H6 K" w
alarm <= 0 ; //設定alarm鬧鈴初始值為零
, x1 E5 l) F3 W& g: f- M else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴: q. X* p& b" u% s, J$ V1 d
alarm <= 0 ; //+ a9 S& i8 w/ |$ I' I! R
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起0 n1 S9 U/ c4 t- o. h/ Y- G
alarm <= 1 ; ; e% o {5 T i( H
end * t- p0 j: e7 G
//-----------------------------------------------------: X9 }3 l- I0 N
//count_d
- O3 ?# ?. k: @/ ?//----------------------------------------------------
8 g; O# _: ]9 F& halways @ (posedge clk or negedge reset) ( j* F6 B$ M; Z8 U
begin3 |& a$ \6 e: [; Q4 z
if(~reset)
$ P1 n$ f3 C# G6 L. u _ count_d <= 0;
# l$ w; k- D1 a e3 A else if(start & counter == 2) 0 h. @/ P6 Q/ P
count_d <= 1 ;
/ w9 H, d, z1 e8 X8 F// else if(pulse_reset_ext)
; ~% ]- G$ T7 R else
4 |! L3 d, r5 D% w6 d count_d <= 0;
$ g" ?3 a, t, \
4 p8 o+ @1 S! A# T U8 P2 H. C% R& E
! Z/ ^8 Z3 @' }, Q% \end2 T$ U2 ^- M4 \) U: r+ B S
//--------------------------------------------------------------, K7 ^ z* ]5 H4 X' ]1 h
//count_dd
- ^% N+ X ^2 e0 U& B. d/ x1 f2 X, P3 E//--------------------------------------------------------------( H6 `: x c e7 ?& r" u2 P8 H( g
always @ (posedge clk or negedge reset)
% P1 d: t7 y+ W& W0 c ?begin
; u3 j8 ?6 B' I1 e if(~reset)4 C* R, n! C1 G( Y6 q
count_dd <= 0 ;
' U- U2 e& w: P# t9 a else if (start & counter == 1)4 n7 N, t- [: ]$ ^3 M4 ]
count_dd <= count_d ;; y# u+ Z. |* ?9 w
// else if(pulse_reset_ext)/ d1 j7 y e4 i
else 7 C# p0 T W- g
count_dd <= 0; : S; Q4 W7 _7 A5 }+ p
; F, e' k/ _. r2 i7 ]' W6 n: x9 Aend' e4 R) f# U/ o, b' @
5 R% z& F; o4 q u$ d, A
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