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2#
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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
1 |6 ^% l; E- K; {' ~module reciprocal_counter_96_11_29 (
% d4 \9 ^* x4 N+ a* q clk,
, B: q" k2 L5 j3 d+ w7 [ reset,
; I k2 E7 \( r2 k min_1,
6 h; p8 O8 o, Q) v9 r# i* } min_5,
4 x- Q; s5 L6 T: D% X8 B min_10,! \, u/ ^) ~; R/ I2 z- ? C+ \
start,
2 ?" l$ K1 D- C% l* b' p; y% X reset_ext,
7 H3 T4 J( d6 @) u% k* c% ^% U8 \% ~1 t ok Q! ?0 P4 b! k
//外部腳位定義-------------------------------------
( s2 m. M& l, uinput clk , reset ; //系統 clk reset
0 `5 A9 j+ e9 k' u, einput min_1 , min_5 , min_10; //設定每按一次1加1按5加一次5按10加一次10% Z# ?% U: d3 K+ q5 \) H
input start; //開始倒數鍵
! D: @1 c9 Q3 _5 R' [input reset_ext; //強制歸零並停止倒數# a0 A1 g8 s4 w) ^) B, {
input ok; //用來關掉alarm鬧鈴 ( O& C- @9 Q- \5 ?& ~
//宣告內部暫存器---------------------------------------
6 q# f3 P+ B/ h; |5 L: O* q* A0 swire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5' V2 B; J4 C' l J L" ~
// min_10 , start , reset_ext為連接線2 {& _( Y1 y3 P) f
reg [9:0]counter; //宣告counter為暫存器
0 L7 N) n; |+ k. I, K( A- Ireg min_1_b; //宣告min_1_b為暫存器+ d4 ~2 [5 F% G: U& U" }) D4 c
reg min_1_bb; //宣告min_1_bb為暫存器1 a+ }5 @8 F( I7 g4 }6 v( K6 J
wire pulse_1; //宣告pulse_1為連接線
+ ], B, ?. Y: ?; Greg min_5_b; //宣告min_5_b為暫存器! x- Z3 j6 b% a. k
reg min_5_bb; //宣告min_5_bb為暫存器
9 B; z9 r) b, L# L( [, `wire pulse_5; //宣告pulse_5為連接線
+ g/ K% K, T4 Mreg min_10_b; //宣告min_10_bb為暫存器 * F. k$ d* C8 {. b: P9 K# F
reg min_10_bb; //宣告min_10_bb為暫存器
/ l! O, F8 K _wire pulse_10; //宣告pulse_10為連接線
) G4 B, J' q* Creg alarm; //宣告alarm為暫存器 9 ^7 P; R" h3 g3 b
reg ok_b; //關掉alarm鬧鈴的暫存器& J: ?# k. f P) O) |: l( s
reg ok_bb; //關掉alarm鬧鈴的暫存器
8 F [* W* V3 w! n' F1 o& K0 [' mwire pulse_ok; //關掉alarm鬧鈴的訊號
) N0 q; z0 S! |0 zreg reset_ext_b; //關掉外部歸零的暫存器 b" r$ x* A: @# t2 i; i) @/ F9 N$ h
reg reset_ext_bb; //關掉外部歸零的暫存器
, ?0 w. m% G8 x0 P/ Zwire pulse_reset_ext; //關掉外部歸零的訊號- t3 M0 k8 t S% d
reg count_d ; //宣告啟動alarm用; j: Z/ r+ T; R: u# u3 O4 h6 R
reg count_dd ; //宣告啟動alarm用
/ t" s" @7 V {& jwire pulse_d ; //宣告啟動alarm用3 \. o, C; c1 f4 T T
reg [7:0]led ;
6 J U0 O% h* T- u; Q% t z& v# K) L6 m- z5 V4 p" z
assign pulse_1 = min_1_b & ~min_1_bb;$ n6 s: B4 e2 Q/ d, D5 b, G# E
assign pulse_5 = min_5_b & ~min_5_bb;
9 P: a: ~0 Z/ F# T. e2 ^" \2 Eassign pulse_10 = min_10_b & ~min_10_bb;
4 x2 x* ]2 V1 ^% _assign pulse_d = count_d & ~count_dd ;. {2 I6 X& @9 X& N9 {7 |* b+ Z
assign pulse_ok = ok_b & ~ok_bb;. @1 m9 R; }$ M( F/ G: f
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;
! L+ M x% L! D L* w* B//-----------------------------------------------------, q& D# [" K0 X4 k" e. h
//計數跟倒數
. A2 E- i7 L# B ?$ @! K//-----------------------------------------------------2 m" |6 l2 R% i1 c: J
always @ (posedge clk or negedge reset)
; I$ d# n I5 o! Z: H9 H( L* w4 rbegin
' A& a5 M( Q9 U! n7 v if(~reset). ]. a: ]: c" b5 i/ u
counter <= 0; //把counter 設初始值為零
, H+ x% }- z8 _3 ~ else if(pulse_1) //5 o1 B6 p# @: q1 y: f
counter <= counter + 1; //+ u/ l: q. C1 i- G! P/ [
else if(pulse_5) //設定counter按1 and 5 and 10的累加
+ o, L9 z r0 j% l6 q counter <= counter + 5; //
) W5 ?5 O0 J3 A5 N else if(pulse_10) // \( R: T1 G6 A4 I, P( c
counter <= counter + 10; //
6 A' w, W$ ^" p% W& t4 ] x! O else if(counter >0 & start) //設定counter開始倒數
+ @/ m; n; I. B2 z counter <= counter - 1 ; // 9 r9 u' W/ p: l, X; ]3 K, L3 [
else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作* {- M0 {- E0 B5 u" Z: N! ?& ~
counter <= 0 ;
3 ]8 ~* i' j4 P3 {# ~end
e' Y2 e# ~! b; l( R: X. F$ y7 ^2 ]2 s/ P: p8 ?
+ `- O( E* P/ p4 N$ G; B* ?5 f4 I6 e; Q9 b5 O! b- Y9 \8 A
//------------------------------------------------------4 I( d6 J4 L ~; c9 Y) }- l8 E
//led_counter3 O* ^9 G5 G8 w5 m. m
//------------------------------------------------------
, k0 G$ ?& h; [* N
. P7 N- @2 l# ~; s, v% d/ v' @" b9 p' U) N$ ]) Q5 ?% ?3 R
0 T- l- a" w7 S) E; M$ f( \
% h' ]6 e! f, U
//-------------------------------------------------------
0 O! c. C1 q& ^) P: c//alarm鬧鈴
0 a0 `/ F" Z" B, `% o& L% `//------------------------------------------------------
- _$ l/ ~5 |4 G. n! zalways @ (posedge clk or negedge reset )
+ R# e* q g/ T4 L: w! Q" Jbegin
* ^& S8 U, [6 j, S if(~reset)* |, x8 k' o, ?, o/ F: l
alarm <= 0 ; //設定alarm鬧鈴初始值為零5 |. r2 ], `! G. L, i
else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴
: |$ S7 K1 u. m: L alarm <= 0 ; //( z" o, N8 A$ l& k" V+ ^
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起 I7 f) i2 X9 c% G; f* E& U: t
alarm <= 1 ; / B" [8 L, G5 f, j: P+ \( R
end ( Y0 D1 T9 F- J k/ u
//-----------------------------------------------------
. t0 v% s+ u: L8 ^1 s" z$ F//count_d8 \% }+ I- A2 L3 X2 R# V- M" h
//----------------------------------------------------2 Z! R% l1 Y4 X; b5 D
always @ (posedge clk or negedge reset)
. X4 O$ T3 Q/ V; N' dbegin
$ L* P( m3 h) S1 f if(~reset); m7 t- F) p0 @: D) ^6 r2 [8 x
count_d <= 0;
/ J% S z* Y, n. M else if(start & counter == 2) 7 m( E, g/ m& W" s
count_d <= 1 ;/ e3 @3 j5 Y& V/ g! Q
// else if(pulse_reset_ext)
8 E' w- \" [+ l [ else5 S$ s. v- l$ f) g- \) B( ^! ]: ?: t
count_d <= 0;
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$ X$ T7 W; n" g0 U
& }/ @0 g/ k0 z0 `( t6 O) b5 h
end
3 ]1 q. s. t }) U//--------------------------------------------------------------% R( A+ C- O1 x& G! W* h5 }
//count_dd
; v5 B9 |7 Q0 w5 [& {- }//--------------------------------------------------------------4 T, G8 d. ~! X$ W$ l1 R
always @ (posedge clk or negedge reset)
& h' M* a6 l& {8 lbegin, G7 B) g) k" O3 A# S& u
if(~reset)
6 ^) p; D( L1 e; x/ E count_dd <= 0 ;
2 j& s; P. p/ A" L; j3 I/ S else if (start & counter == 1)+ h) p; M m5 K' O
count_dd <= count_d ;0 F; d. e4 ?# W. g& m2 s: Q
// else if(pulse_reset_ext)
9 z, R2 K' Z5 k1 v/ s% y0 F else
" [% i/ \, ^$ U- _% q4 l6 a count_dd <= 0;
$ p' q0 R# X: i* R0 C' x; M
4 c" N, y/ L; s, r+ ~$ fend( z, j" @: P5 [. A6 v. x
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