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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
( t$ k# M: L2 {* N5 L7 gmodule reciprocal_counter_96_11_29 (1 h2 G5 b$ d: O8 Y+ }
clk,
( @8 |3 o% u# R" b H reset,
1 U1 w5 r5 q& D0 d( V- j/ A/ d, V# r5 R min_1,& T( P. i% v1 x( ?. M
min_5,
9 u7 `* P" l, H0 ]" P$ P' N min_10,1 s' T8 n1 d5 y, m9 z" j
start,
( O; ^! l7 ?; y& P reset_ext,. I' S3 A6 j( U* @3 H4 p7 {
ok4 I9 \7 [/ f+ W6 a5 t
//外部腳位定義-------------------------------------9 u9 @# Y5 r, Y3 c8 A8 E
input clk , reset ; //系統 clk reset
/ G: a# N, |6 D! [0 V! Q0 Sinput 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" d* ]# w' _1 H
input start; //開始倒數鍵
- i9 \; }( O- hinput reset_ext; //強制歸零並停止倒數 R; y7 D1 S1 G. K: l, P1 C
input ok; //用來關掉alarm鬧鈴
2 Q. D; F! J% U( K6 n//宣告內部暫存器---------------------------------------
/ }& V6 @& z; a: \* kwire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
$ N/ Z+ M' y9 A' |& L0 n4 C // min_10 , start , reset_ext為連接線: Q* n+ A$ k! ~' Q- }2 D
reg [9:0]counter; //宣告counter為暫存器
m! H; X7 }# }* xreg min_1_b; //宣告min_1_b為暫存器, V6 C `4 b! C& a' }$ [0 o
reg min_1_bb; //宣告min_1_bb為暫存器
. ^# Q) a! ~$ u% Dwire pulse_1; //宣告pulse_1為連接線 + C* V/ p5 C! ~9 e* \) b6 K" g% c
reg min_5_b; //宣告min_5_b為暫存器
! A' o- E" o/ Sreg min_5_bb; //宣告min_5_bb為暫存器
; z# L$ K0 _6 \$ T- \wire pulse_5; //宣告pulse_5為連接線 9 k5 J1 M1 h! i6 Q& z) R0 o5 z
reg min_10_b; //宣告min_10_bb為暫存器 9 L0 I5 C$ Y4 j8 }" E4 C8 k
reg min_10_bb; //宣告min_10_bb為暫存器 0 @7 ?, J( g; Q
wire pulse_10; //宣告pulse_10為連接線 0 [- x# c9 N# t& w) y" |7 m
reg alarm; //宣告alarm為暫存器 4 V. X3 U5 |0 ~# j- w4 ~
reg ok_b; //關掉alarm鬧鈴的暫存器
4 x9 f1 U+ k/ {& O; _: Freg ok_bb; //關掉alarm鬧鈴的暫存器) s0 D: ]9 t1 T1 {" ?8 P; M
wire pulse_ok; //關掉alarm鬧鈴的訊號, k: ?8 G3 r7 D- S
reg reset_ext_b; //關掉外部歸零的暫存器; D6 W& I4 f! r% m
reg reset_ext_bb; //關掉外部歸零的暫存器5 J8 f5 T# l% b% u1 j) u
wire pulse_reset_ext; //關掉外部歸零的訊號
( ]& z6 q( ]' L* V- x2 Q+ R: rreg count_d ; //宣告啟動alarm用; [3 S4 H. X1 x' N P0 h) n
reg count_dd ; //宣告啟動alarm用
. P% N8 B! U! |) }wire pulse_d ; //宣告啟動alarm用+ q: E7 V0 t' @7 D2 S
reg [7:0]led ;# j; d! h* N& n- ]) a ? u2 t
4 @2 d8 g T/ @: }
assign pulse_1 = min_1_b & ~min_1_bb;
- A) s: u, X* k- n) ]# jassign pulse_5 = min_5_b & ~min_5_bb;
?$ \9 Z9 V9 @# Dassign pulse_10 = min_10_b & ~min_10_bb;
* C- z0 Q' y" v& n. ^assign pulse_d = count_d & ~count_dd ;. }! p; x. }* H0 j6 n
assign pulse_ok = ok_b & ~ok_bb;/ k, l, d6 ?( I5 X" W9 s. }( `6 k
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;* U5 v% n- B4 o7 W# }9 [
//-----------------------------------------------------& B0 E) b, f' Q3 E: b! ^6 C+ O, L
//計數跟倒數
3 p$ X0 d4 u$ {" f) @% i//-----------------------------------------------------
3 S, L$ D9 P0 S! y6 Valways @ (posedge clk or negedge reset)2 E% t7 `& t* {9 T( u
begin
3 j$ P$ s2 w) Z, L if(~reset)% ]2 D9 T1 H" t2 L* }! M& O7 p! x
counter <= 0; //把counter 設初始值為零* \; w( `9 d" J6 F
else if(pulse_1) //
5 a- S: Z4 A5 g: ~( p. e. T counter <= counter + 1; //
) w' }6 p2 `9 d! z2 {; S0 Y8 F else if(pulse_5) //設定counter按1 and 5 and 10的累加
% p- H( o; F- K0 t) V counter <= counter + 5; //7 R! A, k" ~- w' ?4 g
else if(pulse_10) //9 ~; z' ]* V7 Q' L A
counter <= counter + 10; //
X+ g5 G9 H0 F q" N else if(counter >0 & start) //設定counter開始倒數
& i" Y. W8 W% }7 t' E/ i* a counter <= counter - 1 ; //
' j4 u% u6 L9 t { else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作
* w) |1 b" f3 g$ j- v counter <= 0 ; & `2 s: o# E& f5 t( |0 ?/ B
end
( Y- g& x- T+ d5 `, {
C0 ^, ?4 E0 Q1 N, P' p
7 E$ `+ l; q6 u! G$ L
# _, C: j) L" e5 Z) M L8 Q//------------------------------------------------------
+ @2 J7 l: Q/ x//led_counter$ L- Q* B' b" Q+ n4 f
//------------------------------------------------------
" F! S" \' \2 z- C' G! [
( j6 J" [, A; j5 k& l3 q% `% R; m+ Q, W2 G
2 D( z0 e! c9 F) Q+ W& K D/ W9 ^' a
//-------------------------------------------------------
0 l9 Q: I, R0 b0 @/ Y7 i- @//alarm鬧鈴
2 r+ e. J% g( _/ B) l& l! ~, C//------------------------------------------------------
- m6 h7 T3 F2 C8 ?always @ (posedge clk or negedge reset )
1 I7 c7 u) _1 N; _( w9 Dbegin6 z% h4 s2 B* d& q; ^, W- g+ m. s
if(~reset)
# k6 i9 _- O3 w; n1 h# h- H alarm <= 0 ; //設定alarm鬧鈴初始值為零
& C$ V; l: A1 u8 Q7 n; n9 M else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴
+ a# \( X1 ~6 a4 V# k7 `) ^, k alarm <= 0 ; //
6 W' l& P- T: M6 l1 k4 u8 H else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起% U8 j5 w) U; d! x# U
alarm <= 1 ;
+ p/ ]; u) L+ S7 Z, f" d# f7 T* C. lend
* S- o. l# o \& o6 I+ t3 x4 i$ g) d//-----------------------------------------------------
9 N( K; k- }- N6 i$ v+ H+ ~# f) c//count_d1 ~: b9 C" s; X* s3 F: s
//----------------------------------------------------; o) I. i" M# j2 _: W' q. x
always @ (posedge clk or negedge reset) / h: \+ x6 Q2 D; D6 R7 x" }
begin
' I+ H$ M+ @- |3 \; w: B9 c$ q$ T if(~reset)+ q0 ]+ z) z& k. @: e$ g
count_d <= 0;
. u: |1 R. ]6 R& |* V else if(start & counter == 2)
; @7 V* u( s' {7 d4 U7 R9 F8 u count_d <= 1 ;" J( P% R8 ]* J, K; q
// else if(pulse_reset_ext)
0 d$ U" L5 }8 T. U# C! k" X else5 z! A1 _" F) F6 \$ B7 c' E$ }$ Y( R
count_d <= 0;8 _6 c: C& U: S+ }( H6 B' T! X
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( {, U( B( N: X: r, wend9 @/ `: O i3 Z+ ~/ E+ R) ?: [
//--------------------------------------------------------------& D+ c/ h' u( o) a3 W
//count_dd
& I6 P {$ Y, a9 R" l//--------------------------------------------------------------0 z. _& ]7 O |% O4 S
always @ (posedge clk or negedge reset) . M! ] m8 j5 E
begin% z8 @( S S, J6 a, @
if(~reset)6 P* x9 @5 w" |3 n
count_dd <= 0 ;
+ y$ B# o& g/ g% N else if (start & counter == 1)' }$ P# a' [% R* u/ |+ K5 T- N
count_dd <= count_d ;/ K* X7 J! V0 W3 r- S$ _: U6 e
// else if(pulse_reset_ext)
, _9 i3 a/ u% T! y, a else * y- h: s* B$ ]7 `3 w
count_dd <= 0; % O) l5 N' B. R; k
, e8 H; j; I" `end
+ |+ s' a3 t4 V2 C* [1 d& i4 ^- L, ]# d, M! `
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