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2#
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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/1ns8 x( P- T, C0 f
module reciprocal_counter_96_11_29 (- W4 h5 _8 Q$ A6 B
clk,6 a9 d4 U0 I8 W8 D
reset,
2 k5 p7 g" {) h3 `- {" R; ] min_1,# x" R* B$ _% G
min_5,
! w* V- {" W" t3 _ min_10,
$ F& v' b! `! L2 Q' h start,
; i; e, x: E4 c# w4 U, m6 B: c reset_ext,
) S4 u; S. ]4 t7 ~ ok
v8 |# i k& z7 r% ~8 q! F' H//外部腳位定義-------------------------------------
' [+ t! Q; w- a& U% L$ y Q+ K) Z- Rinput clk , reset ; //系統 clk reset
2 [5 f& |+ c' \: x9 B( e' X- Yinput 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
) H0 g% k$ @9 ~" @$ V7 p% V: k, einput start; //開始倒數鍵
8 A) n! ^) t. _/ Cinput reset_ext; //強制歸零並停止倒數( [7 p' O2 D2 x7 {# q
input ok; //用來關掉alarm鬧鈴 , @, g# \! L- w2 q" X5 X- T/ X. |/ k
//宣告內部暫存器---------------------------------------
' V' v1 w; d4 ]3 ]5 N9 g. Cwire clk , reset , min_1 , min_5 , min_10 , start , reset_ext; //宣告clk , reset , min_1 , min_5
# |5 W! _8 ?. s. e" b: A // min_10 , start , reset_ext為連接線0 L1 D% _& ?; T
reg [9:0]counter; //宣告counter為暫存器, k+ c% g% Y7 T+ s/ t
reg min_1_b; //宣告min_1_b為暫存器3 ?+ e1 M% o. x( V& _4 }
reg min_1_bb; //宣告min_1_bb為暫存器; n0 H- L1 m' b d9 s& j
wire pulse_1; //宣告pulse_1為連接線
+ @, M- k! \8 o/ t( \- l. l3 A$ F4 ~reg min_5_b; //宣告min_5_b為暫存器
# @6 i# p0 C# E% Z: nreg min_5_bb; //宣告min_5_bb為暫存器
, a7 Z$ f, o; N) wwire pulse_5; //宣告pulse_5為連接線 . L' b& E$ g9 e# Z; c# @$ I
reg min_10_b; //宣告min_10_bb為暫存器 & {4 i' F" h0 ?7 f/ H/ r$ u# \/ u
reg min_10_bb; //宣告min_10_bb為暫存器 / d) x, n2 F, i2 R& r! i* _% K
wire pulse_10; //宣告pulse_10為連接線 3 y$ S# T4 H( \, X
reg alarm; //宣告alarm為暫存器
4 H5 g4 E) @& J- t9 x+ U# T1 vreg ok_b; //關掉alarm鬧鈴的暫存器 g/ |2 a k1 @7 x
reg ok_bb; //關掉alarm鬧鈴的暫存器
6 T8 J5 h: ^2 N5 Fwire pulse_ok; //關掉alarm鬧鈴的訊號& c$ C; R1 O1 h, C7 P: ~- m
reg reset_ext_b; //關掉外部歸零的暫存器. i2 f, S) h; E% C$ z) U& ~
reg reset_ext_bb; //關掉外部歸零的暫存器6 Y8 v& u; Y; Y6 F c' T7 x3 ~/ U1 y
wire pulse_reset_ext; //關掉外部歸零的訊號
K8 z( I% `) \/ C% e% Creg count_d ; //宣告啟動alarm用
9 I; z! L4 j8 ^! Z) a" s6 Jreg count_dd ; //宣告啟動alarm用
- ~6 h% d3 {. ^ h: V4 Cwire pulse_d ; //宣告啟動alarm用& c" l! T) Z( |1 a. n
reg [7:0]led ;) N7 p: Z6 l8 G P/ X3 [0 t
! N$ u( }- |; f0 p, ?# w" i9 w
assign pulse_1 = min_1_b & ~min_1_bb;5 V8 O* n! U- ]% S) D# k
assign pulse_5 = min_5_b & ~min_5_bb;( o z1 r D, h
assign pulse_10 = min_10_b & ~min_10_bb;! y1 l% U' a6 z/ M
assign pulse_d = count_d & ~count_dd ;" x' D# I: x2 M# Z C8 J
assign pulse_ok = ok_b & ~ok_bb;% ~9 w4 u5 Q& p5 C
assign pulse_reset_ext = reset_ext_b & ~reset_ext_bb;5 ]( R1 G0 J) m$ Y2 h
//-----------------------------------------------------
( c: R5 T5 ^0 e! o! `1 C//計數跟倒數
, E+ p4 n' ]% e5 }! K/ y5 W+ x G//-----------------------------------------------------" x; Q7 t( U9 e
always @ (posedge clk or negedge reset)3 E6 Y' U" Y% x, l
begin
$ j O9 W6 G* G& K( B if(~reset)4 J; |( d5 X: @# x
counter <= 0; //把counter 設初始值為零9 l& b2 X+ h! N8 g
else if(pulse_1) //
0 L n% f1 E4 w counter <= counter + 1; //
2 i" D# [' H7 c6 S9 F, C4 v else if(pulse_5) //設定counter按1 and 5 and 10的累加8 Y& H2 B/ r$ }! L8 n* E/ s
counter <= counter + 5; //( k- x9 k1 f4 N' x
else if(pulse_10) //
% c4 |$ A' B+ l0 e. m/ P counter <= counter + 10; //
) N0 ~% r% z' H! f z# m else if(counter >0 & start) //設定counter開始倒數$ w1 k$ `0 s O. w3 Q5 P
counter <= counter - 1 ; //
7 }2 m. D6 F9 Q# t0 m5 G1 I; E8 ~ else if(pulse_reset_ext) //設定reset_ext強制關掉所有目前正在執行的動作
1 ~/ m; H5 j6 u) N$ H6 R counter <= 0 ;
6 ^- B; h4 h; X% g* j3 nend6 }! F1 E) e7 a* i! |9 ^( y
, U7 Y# P4 M8 } [3 ?3 y& B$ _, [* J, b+ a
/ ?% M: q$ z2 E- z) ?8 V1 |9 i
//------------------------------------------------------
4 N" h( I! g) v, H//led_counter
3 o8 ^6 c" d1 c8 W4 I- j//------------------------------------------------------) y& N: Y! a1 w+ f
! u" t( ^- j3 l: h
J% a% v7 J0 t: d- f$ `/ d
8 ^ \ U8 d: |/ T/ _% K5 B% [& V% B7 X3 p; r! F
//-------------------------------------------------------' y; R' m" m% A, o7 k
//alarm鬧鈴
3 g' |& {% F1 L% y# Z//------------------------------------------------------
7 m$ c1 D0 d. g2 W1 palways @ (posedge clk or negedge reset )6 E0 @4 N' d! \, t" x6 |$ ]
begin! u5 N% s; V$ V# W' T
if(~reset)! Y) z) `3 |8 f
alarm <= 0 ; //設定alarm鬧鈴初始值為零
: w, j8 y+ V( E2 j else if(pulse_ok) //設定當pulse_ok為1時成真,alarm為0關掉鬧鈴
! F: d" s6 i' L0 F alarm <= 0 ; //( q: e( U' [% h0 T$ L
else if(pulse_d) //設定在counter倒數數到零零零時鬧鈴為1聲響起# c9 k1 p. C' B! @+ b/ @
alarm <= 1 ; 1 Z# J) z& G( g( _) j. k7 A8 O7 x. h
end
% T# Y' w1 |- A4 X ^7 i//-----------------------------------------------------, N* `( R" K9 d8 d* Z9 c! i" u, M
//count_d
( j3 [) M, E: `) R: N; Z//----------------------------------------------------. a P$ S1 t2 c/ n$ b1 d0 a8 ^
always @ (posedge clk or negedge reset) " q' o" I; @! o0 J U7 i G ^
begin
: e% n1 v: e% }: x( f if(~reset)
$ r" |/ H2 ?$ U" X count_d <= 0;
4 o9 D3 g3 h/ m else if(start & counter == 2) ) \1 y* Q6 E$ e# m b
count_d <= 1 ;' I, W6 G5 b5 H) T
// else if(pulse_reset_ext)! e, {9 m: ]" B3 N
else2 l: q- A) M( O) ]' e0 d; F5 s; ^
count_d <= 0;& e; c+ `/ K. F6 r+ O0 t
# t) e1 R: c2 @" t" G
: X) y8 k+ x: ]! Z {7 M4 ^
3 e# W+ B" [1 y# D, yend0 n5 V5 F3 x4 }1 E5 P0 X/ w
//--------------------------------------------------------------
* J2 h0 ?' z( c7 n3 `//count_dd
, K4 l" ]( I/ [; @, {9 y//--------------------------------------------------------------
- \5 p, h$ C& H/ M6 ?always @ (posedge clk or negedge reset) % c8 g% o# A7 j1 Z& H' B! j" d
begin
, ~# |1 v! v, i- Z if(~reset)
( I9 i( x' x t6 i count_dd <= 0 ;7 a9 {% c" U; S& M
else if (start & counter == 1)
: c u$ A1 }( \ m count_dd <= count_d ;( r3 D! C5 F6 N v+ ^/ u0 z! I
// else if(pulse_reset_ext)
1 j4 R0 J6 Q5 L else : M* g2 h$ q _% | `4 Z* j8 j
count_dd <= 0;
* N9 O* l% ?: f7 q 1 n0 V% [3 ]6 t. `) ~
end
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