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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
6 j4 s" K/ ^; A6 A9 v+ }module reciprocal_counter_96_11_29 (& a6 a6 E" \5 M+ f6 T8 D
clk,
( x9 o$ z6 ~0 g$ |" Q- D reset,
) ~( ]4 D& u4 Z; M( w G min_1,
) m$ E* S1 y" B7 l7 @; ? min_5,
* @7 D8 s& y/ |$ F+ M min_10,% Z' y& X/ c- c4 [6 a8 t! B+ g. p
start,
+ z7 J. {) I' @4 y reset_ext,
7 [+ E- K0 ^% I, ?* q8 ]6 D ok1 f5 {! R2 O" f
//外部腳位定義-------------------------------------
" f9 Q/ s! X7 G7 L7 Y, ?9 winput clk , reset ; //系統 clk reset$ l- ]& n9 V! I, N; C1 N
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
% [" L+ e6 K; Q* O' T, ?+ V9 Zinput start; //開始倒數鍵" G# s( X! V1 }* Y' h
input reset_ext; //強制歸零並停止倒數! G# N; K( |% q% `8 _$ [
input ok; //用來關掉alarm鬧鈴 ' D& Z; b# l1 l9 F- b% d
//宣告內部暫存器---------------------------------------
0 i( P5 {9 d _/ k9 J; T& gwire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5# c- h7 V9 Q" n) G4 D
// min_10 , start , reset_ext為連接線
& w2 e$ B1 ^1 p: U9 ureg [9:0]counter; //宣告counter為暫存器1 o9 \$ V7 n+ u& C4 B
reg min_1_b; //宣告min_1_b為暫存器" b* f0 N! e4 @$ I4 q
reg min_1_bb; //宣告min_1_bb為暫存器- s* P9 i0 g- }
wire pulse_1; //宣告pulse_1為連接線
. C! j g, h A# V1 Mreg min_5_b; //宣告min_5_b為暫存器
1 J1 a3 h3 Z, O, `/ {9 {reg min_5_bb; //宣告min_5_bb為暫存器
/ h; \& g& D* Fwire pulse_5; //宣告pulse_5為連接線
. W% r2 h" y9 K8 L! @- b5 Mreg min_10_b; //宣告min_10_bb為暫存器 : f2 F/ q: [1 W; q9 P/ R
reg min_10_bb; //宣告min_10_bb為暫存器 : E! c8 x- {6 f( X8 D( p8 Y& r. f8 v
wire pulse_10; //宣告pulse_10為連接線
. L. ~' w; O' k. S1 preg alarm; //宣告alarm為暫存器
2 j% d' B+ o0 X! X I# g' h2 [reg ok_b; //關掉alarm鬧鈴的暫存器
) A3 ^3 g' J4 A; R4 Zreg ok_bb; //關掉alarm鬧鈴的暫存器) D% o! G4 ^( ~. R9 g P( ?
wire pulse_ok; //關掉alarm鬧鈴的訊號
7 b P* o( {4 N! ereg reset_ext_b; //關掉外部歸零的暫存器
- H3 L% Y5 _# ^" P+ O7 xreg reset_ext_bb; //關掉外部歸零的暫存器* c" z6 q8 o0 @; r; ?
wire pulse_reset_ext; //關掉外部歸零的訊號 O1 X; H& h" {3 m- T' s
reg count_d ; //宣告啟動alarm用
9 E7 f# \# l$ i& p. kreg count_dd ; //宣告啟動alarm用
! \) I: d- O! J- v+ J' q2 hwire pulse_d ; //宣告啟動alarm用" R3 z8 b0 A$ o; h$ _; I
reg [7:0]led ;
" K! o% X \8 }6 {6 N# ~! ?0 N2 u& v; u% X
assign pulse_1 = min_1_b & ~min_1_bb;6 b) P3 W' `# T6 |3 ^3 U& p, z1 p, b
assign pulse_5 = min_5_b & ~min_5_bb;
b2 ]8 [4 b! x8 c) X6 ]. O9 fassign pulse_10 = min_10_b & ~min_10_bb;
* X* M$ K2 _" a) o; {1 F. massign pulse_d = count_d & ~count_dd ;
+ |) ~" T7 q& }4 E4 `. g A+ bassign pulse_ok = ok_b & ~ok_bb;& J3 j" n% b- ^7 @1 D: ~3 W
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;
; S& }1 {8 r+ [% E& E//-----------------------------------------------------
! U) S( m7 R- W9 [//計數跟倒數
4 G+ M- F& H6 D, d! @+ d//-----------------------------------------------------% m+ l: V/ t, m& ?1 x& P
always @ (posedge clk or negedge reset)
0 k$ g* G$ k4 jbegin5 c) q8 O, J' D9 k
if(~reset)
* Z" u! s: i, S7 b1 D counter <= 0; //把counter 設初始值為零: N( ~( U1 S, c4 \1 S; U6 Q+ a4 S
else if(pulse_1) //6 Y7 Q5 _; H5 q9 n t% O5 w; F+ O" s
counter <= counter + 1; //: w, y- U9 T6 }8 r4 f
else if(pulse_5) //設定counter按1 and 5 and 10的累加* W& p) P( N6 ~6 _5 k2 g7 b# u8 X
counter <= counter + 5; //7 n* }, U$ y/ f0 b+ j
else if(pulse_10) //
% E8 H$ h( x& |5 U$ x, K counter <= counter + 10; //
. `9 {) D% Y7 L; Y: W) B8 J% g else if(counter >0 & start) //設定counter開始倒數) N# I& ^! G$ R" A ]. U
counter <= counter - 1 ; // # p' w; j3 [, ~: l6 O- e
else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作
( E" `, G' D0 F2 L counter <= 0 ;
! O4 A J) l( R% i6 j1 ~! {end+ ^' v _$ O2 f( n
" e+ Z" e" V& `: M; v9 d* ? N: V$ P* {8 R b
7 f1 L) G5 L; s. O5 R+ ~$ u
//------------------------------------------------------/ E8 i( T; y/ z9 B! N& {
//led_counter- G: o! s* @; h
//------------------------------------------------------# ?9 g, w3 [# }
) T; i7 v) z j+ K
' }, r) u0 X& t" j6 \# c: `: r l! r
1 e' w. U( |8 B. O6 R6 D
//-------------------------------------------------------
8 V5 J. l8 p- i//alarm鬧鈴( T; E/ h$ G+ G6 [: i1 N# d
//------------------------------------------------------/ T, R' i5 F& }6 r1 M5 a
always @ (posedge clk or negedge reset )
2 m8 X, z s1 i; N. K% W3 z7 bbegin
! o+ f& r* J. L' |- T( {7 s if(~reset)
) r' c) x# S" r& N: ?! T alarm <= 0 ; //設定alarm鬧鈴初始值為零, L* r' u* t& ~. e8 V. H }% Y' S3 u
else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴
' T) r: V& e9 u alarm <= 0 ; //
3 Y- g5 C& v0 d2 {8 q0 @ else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起
7 I& P8 Q, x7 b3 p9 @: J alarm <= 1 ;
+ g2 ~ w9 y5 r$ L2 _3 {' d6 iend : w$ z* e3 w' Y! m3 E
//-----------------------------------------------------, v! ^ V1 s7 C# B
//count_d/ v" q& W1 c' c" X t, _
//----------------------------------------------------
8 I: k' x# D) D6 c- E' f* Palways @ (posedge clk or negedge reset) 4 Y8 R- @" z) h
begin
: t( Q4 x/ E. v" Z5 F if(~reset)8 f/ K% }: S! D$ o. |4 R( j; \
count_d <= 0;
1 K* }/ q/ I5 _: I7 w+ u" s$ I else if(start & counter == 2) 3 Q" s1 w P. \; L
count_d <= 1 ;
# f2 C" R* k* R0 h+ o$ Q, Q0 Z* G// else if(pulse_reset_ext)
; r) d7 H. k5 E! g8 o4 i2 z else
1 C. K: [4 ]. |0 S; f6 l count_d <= 0;
/ W7 W# g) |# l6 ^6 ?! W
' a( I! E0 k& C- c! K
, S T- {$ ?7 k, r + q+ h" \# m' s3 J9 w' }. p
end% m' a; \: Y' @ q: G! W7 Y; D2 h
//--------------------------------------------------------------# ]% o% k7 S. Z6 Y1 @
//count_dd$ M$ c. y/ |6 p1 S; _
//--------------------------------------------------------------- ~0 `4 V$ _2 P* i. i
always @ (posedge clk or negedge reset) ; [1 h; p: n6 o; d2 q& Z
begin
" \; Q( o9 x# A+ K; ]6 @9 e if(~reset)
+ o( z" t& V; e1 f: D# D( S l3 V: l count_dd <= 0 ;0 j+ o* ^7 d" T: J2 N
else if (start & counter == 1)
4 [( \$ Z5 I" o" G* V count_dd <= count_d ;& C6 G! r+ `* m' m/ j, q; J0 |
// else if(pulse_reset_ext). P* q2 M0 Q" I8 o
else ) I( Z1 n' ^7 C
count_dd <= 0;
+ j6 s/ p, d0 l$ [$ r- h- |9 A % |2 s5 T) [- {
end' Q. g: \0 p9 k+ a; l; u; j
& f3 H2 G& l& B$ Q9 g) t3 {" \
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