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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/1ns1 t9 h3 G+ O1 l! Q/ h
module reciprocal_counter_96_11_29 (7 L, H( d7 c# Q' v5 C ^
clk,7 P' b. A3 Z8 N" r! W
reset,# e2 \2 R. a- \ g! @ `$ b& c
min_1,
0 d' u* G& y: Z- M3 u1 V min_5,
+ N: U; [6 ?- |+ ~" R/ Q- r min_10,7 _0 l% X$ \5 l! \
start,
" r0 l8 G, ~4 \1 H reset_ext,# m, d2 g/ [$ B$ `
ok: n3 \& r7 P* f
//外部腳位定義-------------------------------------6 G' k. y/ Z( I" j+ b2 H( n% w7 t
input clk , reset ; //系統 clk reset( W) S: G: q1 A" @
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
, b* F' }, \7 A. F# N9 e2 ^input start; //開始倒數鍵0 y8 g! W9 \, R& f
input reset_ext; //強制歸零並停止倒數. v. n/ `! L0 R- F" d: W
input ok; //用來關掉alarm鬧鈴
2 I) N* n9 F1 v$ `- ~; u//宣告內部暫存器---------------------------------------3 @. l5 r% A0 e* O6 M
wire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
- Z. V4 V( s; F0 M5 `+ Z: M4 o // min_10 , start , reset_ext為連接線
. Q( i0 E1 e1 }! w+ yreg [9:0]counter; //宣告counter為暫存器
5 y$ ~% f% {) C4 h: ~4 U( `& ^reg min_1_b; //宣告min_1_b為暫存器7 K) O* u. H. X/ K. l# r5 p& ~' A! w
reg min_1_bb; //宣告min_1_bb為暫存器* [$ _4 l- G4 d) }. G& T
wire pulse_1; //宣告pulse_1為連接線
* B4 ^$ v8 H# @reg min_5_b; //宣告min_5_b為暫存器1 d3 y' A! O0 S- l) X0 K
reg min_5_bb; //宣告min_5_bb為暫存器
+ c& Y3 h8 z$ o% H/ D3 r! X+ Mwire pulse_5; //宣告pulse_5為連接線 - P# J* l$ Y; J# M0 _; x
reg min_10_b; //宣告min_10_bb為暫存器
7 @/ D/ _' q- m, E) B) Q) j) Kreg min_10_bb; //宣告min_10_bb為暫存器 , @! y7 w6 o( h
wire pulse_10; //宣告pulse_10為連接線 4 Z8 N5 y' C# m, [& U
reg alarm; //宣告alarm為暫存器 + e1 D3 Q. K+ H" m, |- K
reg ok_b; //關掉alarm鬧鈴的暫存器
, d/ \2 a8 `3 z' B0 L% a$ d8 W% rreg ok_bb; //關掉alarm鬧鈴的暫存器
& k0 {6 a1 m, {& X& Jwire pulse_ok; //關掉alarm鬧鈴的訊號
: v. V6 b, v4 L6 ureg reset_ext_b; //關掉外部歸零的暫存器* U1 O( U* n; D/ b z! r
reg reset_ext_bb; //關掉外部歸零的暫存器
\/ w5 q" F# F/ r8 C' Cwire pulse_reset_ext; //關掉外部歸零的訊號
# p3 R8 y7 }& x: x5 T4 o: }, freg count_d ; //宣告啟動alarm用& Z/ C8 m9 N! O, L; {& r* X: m* Z
reg count_dd ; //宣告啟動alarm用# Q+ x, h* e$ ?, R" Y, _
wire pulse_d ; //宣告啟動alarm用
2 I& x- h5 F6 U; i8 Mreg [7:0]led ;
- L: k" a( H4 y7 } p; s8 O
! `* J \/ H+ C7 rassign pulse_1 = min_1_b & ~min_1_bb;
: e- X! D7 I0 h" r/ X. `$ `assign pulse_5 = min_5_b & ~min_5_bb;
/ S' J3 @; q, b: g; ~4 A8 k( h+ ]assign pulse_10 = min_10_b & ~min_10_bb;
8 J8 u1 S+ v& O9 T2 ~2 l; gassign pulse_d = count_d & ~count_dd ;
+ k4 _; k4 @; E; V5 Lassign pulse_ok = ok_b & ~ok_bb;
- k& d% r2 @+ T9 }assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;1 B. Y1 ~3 m7 A; U( u
//-----------------------------------------------------
; V9 x# k, v0 e//計數跟倒數8 t2 [) E( r+ E5 r; T
//-----------------------------------------------------
|3 O$ }# T Q1 o" \% {) H5 ]always @ (posedge clk or negedge reset)3 @. t2 {9 ~, x) j
begin5 ]4 Q( F# H1 ` p2 K5 j
if(~reset)8 M8 `: i1 s2 R5 q/ |8 `
counter <= 0; //把counter 設初始值為零" N1 n- H# N* n# M# N7 y6 b B
else if(pulse_1) //2 w, b- p5 a. z
counter <= counter + 1; //& v: M. E" Q$ e+ W
else if(pulse_5) //設定counter按1 and 5 and 10的累加8 x- y/ E2 H4 R5 _9 M8 Q% v6 j
counter <= counter + 5; //' o$ ]; C J b! u; q
else if(pulse_10) //
" X! }) S# r! ?$ e2 V! H* h counter <= counter + 10; //+ Y% g/ I) y+ S% ?
else if(counter >0 & start) //設定counter開始倒數
/ l& x1 w# f7 q3 O# l, ~# P. J+ c counter <= counter - 1 ; //
: h" }. z3 K G: 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* Z) d, q( U3 c. a
counter <= 0 ; " t0 J/ I/ y+ [6 y
end
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3 ^. b. N$ k+ N. D! m) b5 ~4 I5 u8 h7 v# m# F" Y3 M* t
//------------------------------------------------------
* Y5 z2 P0 u6 \//led_counter. L0 {: Y2 C) }$ S! j3 B
//------------------------------------------------------1 E# Z2 m6 d. |0 b' o" [
Z" B3 a. m% n% t$ g% {! O
5 O: X6 W3 W# L" g
$ q# R6 x" X* k M. X: B
. I* [; h9 Z3 S% Q. Q//-------------------------------------------------------( a C: j) S% K( ~
//alarm鬧鈴' U& Z1 S' ?& l0 t
//------------------------------------------------------
5 t- I& L( [" @) i2 Jalways @ (posedge clk or negedge reset )+ ]+ [ C! w! T) X5 i
begin
q' f% d* s* \, C if(~reset)0 @+ w2 V2 c" L3 u( x- c4 g2 o8 w
alarm <= 0 ; //設定alarm鬧鈴初始值為零( `9 E5 Z2 @2 g) I
else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴8 c2 B: G6 T0 ]. Y# C: a ^: }! ]: F( W7 Q
alarm <= 0 ; //$ F; _% L' T* x) O4 @
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起( ]% `7 v9 F C& [' V5 y8 G! X% V
alarm <= 1 ; 9 J) S+ T/ [6 N5 b$ w
end
% q0 o8 T: G& e' i q//-----------------------------------------------------
: H" i" p. _5 y O$ s- ^//count_d
# _: V, i! k8 _2 n E* N7 n6 n//----------------------------------------------------+ M5 l( T- \# _
always @ (posedge clk or negedge reset) $ J' \1 S$ V" f) `& I6 F! k/ `& f
begin! b2 z7 S: ^' I: `5 u @
if(~reset)
: d; x& g/ W- `" x count_d <= 0;( h, J7 M1 P6 e
else if(start & counter == 2)
1 l8 ?! K2 l& J0 @$ a2 O count_d <= 1 ;
% G7 y* U0 q' X( d0 r! ?// else if(pulse_reset_ext)+ `( I$ m( z# r9 V9 W8 e1 L
else4 z! y! k& l+ P: ?& e
count_d <= 0;
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0 a& n/ h- @! } h5 N/ } 0 W: E/ V' ~4 }! T$ D
9 @6 |8 k. W" ?+ u+ d
end. C7 Z6 h7 v d6 j1 f
//--------------------------------------------------------------1 e( I& A; v8 m9 z& ^, B2 B
//count_dd
- i2 p2 D2 L3 d( G% ?//--------------------------------------------------------------
4 |5 | W5 o) P }always @ (posedge clk or negedge reset)
7 J' m. w3 r# P/ e( N, o4 j: dbegin
# ~9 f6 Q% W; y, H! I if(~reset)& _" o( d5 L, D2 M% y. c
count_dd <= 0 ;
( P, |9 `0 Z0 u5 N else if (start & counter == 1)/ t$ ~* _8 |5 v0 ]1 N$ b4 _+ l
count_dd <= count_d ;
* c8 r3 r% l. q; z8 A* l0 y// else if(pulse_reset_ext)
# q- e# Y0 Q1 g6 g else # \1 n' i. i, H
count_dd <= 0;
( |( h! {- r" h# B8 Y2 ^ W- W- F/ z' Z+ v. A$ ^9 ^
end O: U# n2 v$ k( n) j, q0 ?
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