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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
, H7 l# @1 y: T8 s1 X- smodule reciprocal_counter_96_11_29 (
2 ]8 J) v# ^: s% s/ V& F/ o clk,% i5 U' A+ E$ k! c) `: N; ?
reset,3 n' F0 g0 }* V# w. N. m
min_1,
6 M( l0 b z$ o# X* ]6 e min_5,+ P u1 X. g' N& s7 j
min_10,
: S, G" |+ K+ A: R0 e. t" ~ start,8 o9 J' b1 U- D3 D+ f
reset_ext,
, M7 ?5 T6 X$ U7 E/ u ok
1 {9 [' g6 z9 @: U: ^//外部腳位定義-------------------------------------
( t2 ~% E- ~7 Z2 a0 Ainput clk , reset ; //系統 clk reset0 R0 }$ g& b2 J' P+ O) E! B
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
/ t; ]* `: e7 T( O1 qinput start; //開始倒數鍵" Z; M; y! X& q. _- F$ {
input reset_ext; //強制歸零並停止倒數
8 L0 S; f* v- D2 w8 {1 C" i3 e8 u) Kinput ok; //用來關掉alarm鬧鈴 3 C! G; _/ r) L- G8 U
//宣告內部暫存器---------------------------------------
; ^2 Q6 s8 o2 v+ e+ Hwire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
( R2 N" s0 d: o4 F7 W0 C // min_10 , start , reset_ext為連接線& { i8 i3 T- i; B* H3 t/ M
reg [9:0]counter; //宣告counter為暫存器% ^, x+ _% n: j3 m% _. A# p
reg min_1_b; //宣告min_1_b為暫存器
8 H: W( u. h/ w8 g ]4 E' W9 a; ? Creg min_1_bb; //宣告min_1_bb為暫存器0 {8 F0 y5 E; h' c7 c- |1 ~
wire pulse_1; //宣告pulse_1為連接線
2 b" L9 }) q0 creg min_5_b; //宣告min_5_b為暫存器
' H2 r) O. ? D( M, T) {reg min_5_bb; //宣告min_5_bb為暫存器
6 h8 b9 d3 ^8 v& gwire pulse_5; //宣告pulse_5為連接線
, ?6 |3 Q7 K' j* b# }* preg min_10_b; //宣告min_10_bb為暫存器 7 }: @- M2 l- ~) |, u0 `* W9 S
reg min_10_bb; //宣告min_10_bb為暫存器
6 ~. f; p* f# {* ]wire pulse_10; //宣告pulse_10為連接線 " q8 k8 T6 p0 l& L7 G ]
reg alarm; //宣告alarm為暫存器 ( B4 _$ l/ D, c3 c8 K% i' \
reg ok_b; //關掉alarm鬧鈴的暫存器; }. S _% w% e! N y
reg ok_bb; //關掉alarm鬧鈴的暫存器, s& D5 Z( n; a5 n
wire pulse_ok; //關掉alarm鬧鈴的訊號" B+ R* p* ]- d2 Z+ u- ^+ [# G
reg reset_ext_b; //關掉外部歸零的暫存器( M# v* x5 R; |6 @
reg reset_ext_bb; //關掉外部歸零的暫存器
/ n2 v: [) y- B7 v8 S' fwire pulse_reset_ext; //關掉外部歸零的訊號2 n2 A' }! M* c/ Y8 L
reg count_d ; //宣告啟動alarm用
# N) f% \2 {: {4 T& c( Freg count_dd ; //宣告啟動alarm用
4 R0 m+ ?5 B2 l L2 u, o7 ~5 vwire pulse_d ; //宣告啟動alarm用2 r' y6 k3 s8 H( x6 H
reg [7:0]led ;: y/ I7 n5 V( ~4 p% r# Q2 {5 U
9 G1 l s+ y7 Y" Z6 T- ~8 Fassign pulse_1 = min_1_b & ~min_1_bb;7 ~* Q% _( z3 s; g# e* N! n
assign pulse_5 = min_5_b & ~min_5_bb;0 j8 o$ N' o E7 ^
assign pulse_10 = min_10_b & ~min_10_bb;
, ?/ C! Z! Q! k) z8 oassign pulse_d = count_d & ~count_dd ;
/ m: d% y8 m3 _assign pulse_ok = ok_b & ~ok_bb;* Y+ c$ |/ c* \0 m* b$ Q# l
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;
% }, @. J1 w' t, o T( H//-----------------------------------------------------
% o: R! Z2 S4 ?5 R+ S& @//計數跟倒數% \) l8 t( }! h7 e
//----------------------------------------------------- t, a* R3 W7 v' E
always @ (posedge clk or negedge reset)
5 J/ i+ Y% e7 o5 q+ q# t, ]8 v% Zbegin7 U$ ~( c5 ?9 N- ~2 Y
if(~reset)# i: W; [( D7 h
counter <= 0; //把counter 設初始值為零2 r1 [% d4 f9 l+ G {
else if(pulse_1) //" z3 z; U/ @0 A! {! `
counter <= counter + 1; //4 w* j8 l l: ~0 n. |. ~
else if(pulse_5) //設定counter按1 and 5 and 10的累加3 @% w0 S& I% S2 k; A- j, t
counter <= counter + 5; //- b t1 k! L. e3 S- o. z b8 a- I. H
else if(pulse_10) //6 Q! R( B$ \" c0 n& E \' a3 [
counter <= counter + 10; //
4 ^8 U' ] ^" g! a else if(counter >0 & start) //設定counter開始倒數0 C( p- A4 q7 Z, K' P5 o
counter <= counter - 1 ; //
" W6 Y$ k! X, R$ ] [8 X else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作
z% U P5 i3 r. Y counter <= 0 ;
( r( ]" C) T& e- Hend
" E4 [' H2 F6 T) |
+ {2 h! B6 b, f
* u( a6 R T0 d3 p5 H, \
3 P0 W# [& \6 K* g$ j//------------------------------------------------------
) x( s! k) Q8 a6 I% ?" a//led_counter7 }8 L8 e: s, y, _3 A O2 j
//------------------------------------------------------7 W3 Z3 t; |- R
& o/ D2 s5 J. n* J9 _ }- M0 W6 m9 q2 S7 m
, L4 g f/ X/ V4 F. x. K* a
* S% O' @8 t2 z7 F( y//-------------------------------------------------------$ z% l- D- v: @/ e' D
//alarm鬧鈴
1 b6 y- H/ u f) |0 r" y& L//------------------------------------------------------
; l8 n6 Q9 E1 S! ualways @ (posedge clk or negedge reset )
# U9 S7 C! D4 w4 y+ zbegin
2 G* z- K- S$ b! s, A if(~reset): `; z5 r- k$ n! t7 X: A
alarm <= 0 ; //設定alarm鬧鈴初始值為零
: }* X \9 j1 ?' p2 p) y else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴
% ^# u! V8 s3 n7 s( X alarm <= 0 ; //
4 @4 d! b% i$ e" Z else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起
1 R: c# I! b7 c+ M# N4 r; W& k alarm <= 1 ;
! x) V3 r9 j7 ]# J: R/ A9 E; l5 Bend . G! j$ f) w) \7 Z+ L' ?- |
//-----------------------------------------------------* C4 G# u! j, V2 k; b U$ @. ^/ z
//count_d
6 f+ q8 b9 S. a7 d1 ?2 p//----------------------------------------------------
) g1 R' g" K/ |. Calways @ (posedge clk or negedge reset) . b6 B% k' L, {1 k$ Z
begin1 M5 z. Z) a2 i6 {
if(~reset)3 G& B* O: u, f+ {$ F( ^
count_d <= 0;& p1 J: Z+ Y) C# {; ]
else if(start & counter == 2)
+ |7 j2 O! p/ x; z3 Z/ t$ p2 \0 Q count_d <= 1 ;
/ i+ p! a7 B- d- v' z- X, r6 U/ R# T// else if(pulse_reset_ext)& z1 B: P2 K. x% v# s
else z6 o+ E. n, g" f1 C# z, K
count_d <= 0;- D1 F3 w$ {2 e2 _- d" o: w
1 Q$ y1 }2 u: @! }) q$ r
6 P/ H% D' b/ D4 P8 ^1 f 7 u4 G7 {, s6 X: u1 i/ N
end" V% Z {. U& M4 \: q. s7 j
//--------------------------------------------------------------) n& t/ x; d- {
//count_dd
7 a$ t/ |: R# n) r' ^3 X//--------------------------------------------------------------
, [' s5 p" x9 P0 T( c* Z0 W) ]always @ (posedge clk or negedge reset)
2 K7 J# w6 a; N) S. p. {begin
U9 r( c2 s8 V9 i1 n if(~reset)0 z% x* X' G5 J/ t- {% Q
count_dd <= 0 ;
- N# X, o6 V& u, G) @ P else if (start & counter == 1)
9 F+ \- F7 S0 A' F count_dd <= count_d ;2 ^5 E$ B! r! C; H
// else if(pulse_reset_ext)
, Z3 a4 \5 m! V0 D' U& j: p else 8 V8 M" E& i% A: N r4 r
count_dd <= 0; 9 o( C4 B$ Q, }9 m0 a& `# r& v6 u
4 [8 H+ l, l& M. C# j4 c) L7 V5 uend2 g. R" m4 S! H7 S3 M
2 v* u! Q( P6 l3 X, q! T- I) ~* U
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