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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
7 D- m# b5 e$ n; T4 Zmodule reciprocal_counter_96_11_29 (2 V! k0 n" U: n+ Q- m6 D# H
clk,4 f; {5 k: g# e0 y; _
reset,
* X- _* V6 |1 Y6 C( D! `/ R min_1,
" t/ ?4 q; w7 E1 A; b min_5,! @ E D' b" w: |
min_10,' [: C$ H) e% X9 Y8 q4 ? ^. g# b
start,0 `- q: W, G) U+ v
reset_ext,, t2 t {) V/ J2 P
ok
+ L3 h4 P: E3 {. d4 v$ f' {//外部腳位定義-------------------------------------3 h# \& o5 L& k# |% H
input clk , reset ; //系統 clk reset4 t+ L/ z$ d/ A+ L9 p, 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100 U0 l6 Q! V" O* \4 x+ c
input start; //開始倒數鍵
) h+ y. R! Q$ Finput reset_ext; //強制歸零並停止倒數% W0 k) Z0 z2 C* T
input ok; //用來關掉alarm鬧鈴
: Z1 z, N) h3 E$ G, J8 c//宣告內部暫存器---------------------------------------5 l! ? ~" v& R F, H0 i
wire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
+ R x) D. B" v v4 W // min_10 , start , reset_ext為連接線
1 ^, {9 j8 }, | A# Xreg [9:0]counter; //宣告counter為暫存器" e6 i: U% l/ x4 c) F( j8 H: r
reg min_1_b; //宣告min_1_b為暫存器
! u0 `8 m) k" e& I* J4 Ireg min_1_bb; //宣告min_1_bb為暫存器 \0 {' b. c- G
wire pulse_1; //宣告pulse_1為連接線 , E4 X w% K2 r, o9 J8 f: W
reg min_5_b; //宣告min_5_b為暫存器" {( ]5 T; [' ]
reg min_5_bb; //宣告min_5_bb為暫存器
7 z8 `" M2 {9 Ywire pulse_5; //宣告pulse_5為連接線 4 O @5 V" T" z6 Y8 n: P
reg min_10_b; //宣告min_10_bb為暫存器 Q3 H0 `2 Q9 V/ u
reg min_10_bb; //宣告min_10_bb為暫存器 8 ^5 m; ?/ @, B
wire pulse_10; //宣告pulse_10為連接線
2 X( Y4 S7 T3 ]+ V) D3 H- d3 treg alarm; //宣告alarm為暫存器 ; Z8 `* J7 w# R+ g/ T
reg ok_b; //關掉alarm鬧鈴的暫存器( j# d- a8 v! W4 D0 H% z; b
reg ok_bb; //關掉alarm鬧鈴的暫存器
. l8 i" R; W0 [# mwire pulse_ok; //關掉alarm鬧鈴的訊號% k- o9 Y6 G- @
reg reset_ext_b; //關掉外部歸零的暫存器% R B1 q7 ^. O. h; ]4 U
reg reset_ext_bb; //關掉外部歸零的暫存器
/ V" l, f6 C) v% Y- @; cwire pulse_reset_ext; //關掉外部歸零的訊號! w- s4 W$ h! f! i" J
reg count_d ; //宣告啟動alarm用( _+ g( }& _' Z% I! M3 h) g5 Q8 Y
reg count_dd ; //宣告啟動alarm用
* v$ ]8 ^/ A$ Y7 Q2 T; _* E5 Vwire pulse_d ; //宣告啟動alarm用
& l! q+ X n* wreg [7:0]led ;3 z' m3 _% t) [0 \7 C- S
& n- w9 y: ]* Y" c2 C
assign pulse_1 = min_1_b & ~min_1_bb;4 c' l* }; s3 r" M6 x& }- M$ W
assign pulse_5 = min_5_b & ~min_5_bb;, X& y0 B! {1 n% c e t( N3 m
assign pulse_10 = min_10_b & ~min_10_bb;
' e3 J3 t, [/ C' E, C% I, c. ?assign pulse_d = count_d & ~count_dd ;
" f. n' u8 J: P0 O( |" ?+ hassign pulse_ok = ok_b & ~ok_bb;* o( X8 B8 _7 k8 W2 C* R
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;
9 @2 w% x3 E, g$ P* z4 s//-----------------------------------------------------" ?5 [0 E0 Z% `- |% U, K1 W
//計數跟倒數
3 f0 z& G' P4 R( o! H; c//----------------------------------------------------- l; X( O# y& M4 m
always @ (posedge clk or negedge reset); S9 m8 [& w; a
begin2 j5 S! h6 L' K0 \/ `5 G+ ?. B _
if(~reset)5 e1 [* C9 \* c3 v
counter <= 0; //把counter 設初始值為零+ j9 S l, F* ~$ h
else if(pulse_1) //
2 q r3 Q% e9 t5 v counter <= counter + 1; //
% _) ]1 O" u' [: _3 K- ` else if(pulse_5) //設定counter按1 and 5 and 10的累加
. L0 D5 m, R8 A+ W& V( \; S counter <= counter + 5; //, o: m1 v5 P# ~
else if(pulse_10) //: a2 l1 f2 E: L" O8 q% s
counter <= counter + 10; //3 k5 k2 k( X0 y( l1 A9 p6 c
else if(counter >0 & start) //設定counter開始倒數/ ?8 {+ y0 A( l `& ^2 z
counter <= counter - 1 ; //
6 b# l& s7 B! S- f; T8 {( ?, P 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 y- v$ ]- E! s( l% G7 N/ v counter <= 0 ;
' _5 _! g& H+ _0 c7 B. b t1 bend
6 {% i6 o- H2 I: R q" X& I, U' E0 ]2 n1 v" h4 R" _$ b7 g/ ~
% U* U# e! A$ _. _$ e( D- z( z
3 M5 V( _6 c2 O9 g: |& ? Q//------------------------------------------------------9 Q: w: y' m4 E- l
//led_counter0 k4 r: b1 o/ M4 ~+ `' j
//------------------------------------------------------2 x6 _! Z5 [7 a* r6 K5 B
% K. f, Y& n; N" q4 x+ Q0 n6 L
3 v2 f. ?7 N" o1 _1 ]8 O4 Y+ w1 w& P3 @# i& G
5 s3 y# [+ J m1 `) x
//-------------------------------------------------------4 [9 T5 G, t0 [
//alarm鬧鈴+ `2 I8 L; `9 |: j0 W: ` }0 x
//------------------------------------------------------: X* d- E: E4 X/ @0 j9 Y7 F
always @ (posedge clk or negedge reset )4 n* j. Q: V4 Z+ y
begin& r& x Y" Y$ R
if(~reset)4 o9 B- j$ [6 }1 |/ |9 e
alarm <= 0 ; //設定alarm鬧鈴初始值為零
: d; q; D/ O# a& \: g9 v else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴4 a* z# b4 ~5 ?. a2 Q
alarm <= 0 ; //" O* Q% ~6 ?% E7 \" O
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起0 ~2 s; l. u1 ]0 h% ~9 c* r& Z
alarm <= 1 ; 5 Y, \" {: t" h- Q3 m( l2 z, C
end
: G2 h- B( @% S& [& u3 G, C//-----------------------------------------------------
! K! o8 ~% Q: M0 D& k//count_d* ]" ~! e( N+ p9 M2 j- z
//----------------------------------------------------' H: t3 j1 N& M9 g( Z( I
always @ (posedge clk or negedge reset)
9 L# J& P$ M jbegin
" w) q; ^& |/ a3 _. b if(~reset)
( M& ], o" c1 l4 S' P count_d <= 0;7 T1 r( z$ R$ s8 p% ~; R9 k# T5 I
else if(start & counter == 2) 1 l" Q4 d! o B- S7 M
count_d <= 1 ;
7 p2 P) \2 u2 m. l7 h1 L# z% t// else if(pulse_reset_ext)
; e( N8 ?' ?6 z% `2 o! m else5 u, Q8 N6 s" z! C5 \+ A- n
count_d <= 0;: l5 I* m" \% L' L! e
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/ M0 |- D, W/ _! [* M& O$ R6 m6 ] % m& p+ [+ M n2 _- r/ ?8 ?
end1 j4 {6 j* `7 p: r0 k w7 x0 } @
//--------------------------------------------------------------
4 ^9 [4 t) ]7 E, X4 ]8 I//count_dd0 i1 g) R$ i+ X
//--------------------------------------------------------------
. e8 k. l$ I, V* c2 c5 }always @ (posedge clk or negedge reset) $ I2 E4 t3 S. ?/ i9 B+ }% D- S
begin
9 i" [9 h3 O2 f! C. R( H if(~reset): S4 y. t$ S$ v: |% A
count_dd <= 0 ;
& C: N. I) t& |0 j1 h3 { else if (start & counter == 1)/ `! k t; B+ U$ o0 ?( `
count_dd <= count_d ;
4 [4 ^1 K" u- S3 j+ A/ ^" i1 F// else if(pulse_reset_ext)
, ^" U3 `$ b) M& K0 x( W/ ] else
# F* e# {1 i: f count_dd <= 0; ! C- U' j) m5 l; N; d$ P: r% K$ g+ r
% F" f V9 _4 ?( A
end
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