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2#
樓主 |
發表於 2007-11-29 13:32:01
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只看該作者
這是小弟寫的倒數器
`timescale 1ns/1ns
/ `" `4 M3 _0 p3 X& U+ Mmodule reciprocal_counter_96_11_29 (5 X: }2 s1 b I
clk,7 f( t1 `4 p7 Y5 v
reset,
% t/ f9 r1 u6 |, b8 i" z min_1,) g _, R/ l s1 C1 T; d* {
min_5,
9 A* w) t$ c% d0 y) {0 W min_10,# X6 ~/ s. s7 ^ A6 k* _5 K7 W
start,4 M1 [+ P5 P' Q# S! X
reset_ext," p& m1 \( F6 [- }+ O
ok+ y3 D' Z. v" y d6 g& `# q2 y+ a
//外部腳位定義-------------------------------------
( R0 n, [& Q7 A$ j6 {7 _; z3 Hinput clk , reset ; //系統 clk reset
K" k$ b% a) `5 h6 qinput 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: W' E. ?0 Q9 f0 |/ s
input start; //開始倒數鍵' A1 T! H! h! f+ U
input reset_ext; //強制歸零並停止倒數
$ q! F* T5 `: q! B5 k5 r3 H2 n* U% B; Einput ok; //用來關掉alarm鬧鈴 $ [$ T( ]! L: j# H0 i; u4 _
//宣告內部暫存器---------------------------------------; P6 a% @4 O( w, K! V
wire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
, s" O/ y) y1 [ f$ |4 }' Y // min_10 , start , reset_ext為連接線
$ |) h7 d: M- ~ w* [1 a- e9 ireg [9:0]counter; //宣告counter為暫存器5 {0 B9 [- p( d
reg min_1_b; //宣告min_1_b為暫存器
7 O7 n4 _# J9 F- K. Oreg min_1_bb; //宣告min_1_bb為暫存器
1 C, T% M$ s! D, ?6 }wire pulse_1; //宣告pulse_1為連接線
7 A: Q5 F- T0 ireg min_5_b; //宣告min_5_b為暫存器
' B2 W. J3 Z ]reg min_5_bb; //宣告min_5_bb為暫存器
# A$ I" Q U' }; i, k. {9 Z* Kwire pulse_5; //宣告pulse_5為連接線
1 i F# y, U) w B/ F$ ^4 sreg min_10_b; //宣告min_10_bb為暫存器 $ A% c- e0 T ?! ^3 U+ D- W
reg min_10_bb; //宣告min_10_bb為暫存器
7 y# p( S+ {9 u$ `4 mwire pulse_10; //宣告pulse_10為連接線 ! s( T3 s \! D- U2 Y% a5 U% }! H5 ~
reg alarm; //宣告alarm為暫存器 . Q2 P! y" l( u [3 ^
reg ok_b; //關掉alarm鬧鈴的暫存器
1 S9 e, }7 M' V( q. hreg ok_bb; //關掉alarm鬧鈴的暫存器* N% d: \% e) Q* e% ~% Y( Y' r* x; U
wire pulse_ok; //關掉alarm鬧鈴的訊號
3 m# L1 S5 V4 L3 Z Yreg reset_ext_b; //關掉外部歸零的暫存器! c ]9 g9 q1 |* O1 [
reg reset_ext_bb; //關掉外部歸零的暫存器
9 _( K q1 ^/ E2 x2 dwire pulse_reset_ext; //關掉外部歸零的訊號
3 y4 u2 ^; q! I. c6 a. {reg count_d ; //宣告啟動alarm用3 j/ R1 }) N) W0 @$ L4 i; A
reg count_dd ; //宣告啟動alarm用
: d. b" Q/ ]! O& v+ [- Twire pulse_d ; //宣告啟動alarm用1 T4 J, a1 W. t }* x; Z' {! U: F
reg [7:0]led ;
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# m7 E: W ~3 p H( j0 aassign pulse_1 = min_1_b & ~min_1_bb;
: ?+ N" G0 h* v8 \assign pulse_5 = min_5_b & ~min_5_bb;4 Y% y, u( |- v) b' W
assign pulse_10 = min_10_b & ~min_10_bb;' B$ F7 V" z/ I
assign pulse_d = count_d & ~count_dd ;
- E: N) e) z* t" H9 Aassign pulse_ok = ok_b & ~ok_bb;
5 c0 D% _9 W- Y. G% ]assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;
8 Y# C, ~% l+ W q//-----------------------------------------------------
2 j3 n9 o9 q, v//計數跟倒數
$ d! D1 B$ v% D" _* |0 h8 R. W//-----------------------------------------------------
+ q4 M0 x7 Q! I6 `' }: _always @ (posedge clk or negedge reset)) B+ d0 J+ j4 i+ Z' r
begin+ f0 e" N0 K D0 Q5 a
if(~reset)3 w6 c+ m' q Y: ]
counter <= 0; //把counter 設初始值為零' L- p; i5 L9 @. D* b0 [5 X
else if(pulse_1) //
! I1 l& ]2 e6 z9 U counter <= counter + 1; //2 W. L% Y+ G" o# S- q3 f
else if(pulse_5) //設定counter按1 and 5 and 10的累加
- T% F0 U. ?1 p l2 ]: N: ]: W) Q counter <= counter + 5; //
) Z* Y% W0 e" Q* s$ y% |( P% r( M else if(pulse_10) //
1 n& i' A$ f" q. m# n$ h. b counter <= counter + 10; //) U* V3 y% g" R0 s3 C
else if(counter >0 & start) //設定counter開始倒數
t) ~. _1 ]+ \* d. j counter <= counter - 1 ; // 6 ]3 d6 v. |/ {) W& }7 Q9 F, \
else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作) I0 c# u9 Z: ^9 U: n
counter <= 0 ; ' H) r1 T$ O' H& F U0 S. ]
end
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8 ?$ B a) t- N$ J. \3 a* y& y# e$ g3 L8 M+ @6 t }/ M
//------------------------------------------------------' l4 ]" Z2 i9 c$ k
//led_counter
4 P0 Y. M: K1 J8 j9 k+ O! q* y+ M//------------------------------------------------------
+ @7 ?9 Z6 s( m8 b( v# J8 `5 T l0 \5 r. a' U0 I
T! z4 A/ F, D3 N
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' m% d( X. J1 J% A//-------------------------------------------------------% O7 y8 P3 |- U
//alarm鬧鈴: b8 s. |% T+ e4 y
//------------------------------------------------------
$ w2 d% K9 U; S/ I1 h K6 }4 Ralways @ (posedge clk or negedge reset )" s$ R% l/ d% l; {% Z8 s* S( u, ?
begin6 m1 w7 K3 ~% D
if(~reset)
" _, s2 l+ t# i7 v/ V: \( R alarm <= 0 ; //設定alarm鬧鈴初始值為零/ U: H7 h8 e! K
else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴
2 d! K. |" L P alarm <= 0 ; //
; U; q. \8 q' e9 c# q7 z& R else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起, k/ z1 m( ~+ r" h$ \1 W
alarm <= 1 ; , N1 u3 u) u4 W
end
2 Z y& X7 f4 c1 _5 ?, m6 [6 [# P* C//-----------------------------------------------------8 N7 Q; e3 E; p+ G; B6 j
//count_d( Z: G- p3 y1 f/ _5 w9 _
//----------------------------------------------------2 a" T8 y# L' s R
always @ (posedge clk or negedge reset) 5 O# R h: q1 n
begin
+ b. C6 I1 k2 X# u5 L* C5 J% H if(~reset)
, Q1 D8 N* y! t% u, u3 }0 x count_d <= 0;
# v5 g, K( z# P, Y+ D( Q& f7 V else if(start & counter == 2)
/ K% `: v6 f. L: ~2 |6 i count_d <= 1 ;% g/ X* d. l; o; C, L
// else if(pulse_reset_ext)
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count_d <= 0;
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end$ U. j+ M Y9 `8 S% M" `; p
//--------------------------------------------------------------) r* f2 Z' k1 X3 e3 Q6 T
//count_dd
: a& R( a: c0 g4 w3 y//--------------------------------------------------------------9 h- H6 A) ^. a, u
always @ (posedge clk or negedge reset)
) L+ r& A6 h; x+ Y$ Dbegin
- R6 ?) e; n6 a& Z0 X9 I7 ~, } if(~reset). m6 L X: a9 k w, e
count_dd <= 0 ;
& c5 i3 o% \$ j. M# J5 } else if (start & counter == 1)6 r$ A- |4 q0 g
count_dd <= count_d ;
+ q, \# I' A( k/ A; |2 p+ r3 t// else if(pulse_reset_ext)9 [4 r) W2 I- O7 J& {/ P
else
, S7 J4 ~) z7 U" u4 t, H count_dd <= 0; $ S/ f, k& T* G. h
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