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1.源代码如下不能生成状态转移图
- [2 ~" ]: @- J+ E! Q7 F6 [: r9 Mmodule fsm(
" U) R4 H! G- e5 B7 n# |, ?+ n$ Y9 E! @2 ~. x/ [* E
clk,* Z( v2 O- [* N& R
7 I; f' g2 ~ s3 f
reset,
8 P6 C& V* p' }& d! S4 o8 p- F O% C1 W
A,
# m( c' ^9 y9 T7 t. H
& _# o8 Y7 e4 J# D! n7 UK1,6 w7 ~6 r! [% b$ C1 {
3 d, J' Y( Z0 Y1 u" {' D( K4 QK2,7 j4 E& q8 F( F8 m5 |4 i; Q
* L* i7 t' t# C6 |+ P- z- B% Bstate
/ t- d1 Z; S3 m5 S& n$ W x );
; Z3 f* `. t6 Y, s0 B, K& v6 f; N) ?, s! d
input clk,reset,A;7 j' s& n5 E" a, m
output K1,K2;' Y/ O+ p- {- q+ R: N/ c
//output[1:0] state;
) I7 x5 K0 h- Q7 L0 Ireg K1,K2;+ O d5 y4 \* X F; B' y
reg [1:0] state;
* U/ z1 p* b" f* [2 ]* w2 k) ?
t5 i+ O: V+ a% c$ }3 i. a3 {parameter Idle = 2'b00,
8 r# e" k3 @" k) T! H$ Z
4 S6 l$ c q- m' D3 c Start= 2'b01,1 L% h3 s1 [8 ]* U5 `
# w; ?1 f8 c; C0 u! u Stop = 2'b10,
+ \- t3 e# J: P# m* v. Q1 J8 K, q0 C5 q6 c/ `
Clear= 2'b11;6 Q' R8 O3 b$ c! a8 a
: @* j9 K# G! u# c/ N " t+ O- z$ G+ ~" O. W$ k
always @(posedge clk)
0 K2 p( ~; Y1 q9 J& b1 H' Tbegin; p+ }, ~4 p" ~! u) N0 b: g/ w
if(!reset)
2 Q8 O3 T5 Y* u$ ]/ A+ m( I% A begin% K! k( a+ c, |* {3 i6 r" ~2 [
state<=Idle;& p/ }( f& X- R) L# @
K2<=0;
7 x7 J: ~& _5 V. F' w K1<=0;
) N: E" K+ L' t. u o! u$ F" ?" y end" b' @8 u. |) N( e* U
else7 N8 h- o9 B& E$ f$ X
begin) Z, r9 V0 r7 J
case(state)4 L6 e* u2 e P6 k6 f! r5 x
Idle:
' [! R5 O+ c( j: ^0 ], B" @ begin' W. J! ~. } {1 r: }( G( _
if(A)7 t: {5 ?3 ~% | p8 L
begin) Z: f/ j. y4 z2 c
state<=Start;
& \+ r8 E/ D) l' ]& j K1<=0;
0 }$ q# U# @1 ]3 K |8 l& `( a end
$ j. S; E- K6 Z1 o1 q2 C else3 S9 V( p o/ o- M' q0 z$ l
begin0 G# U3 {3 p; |* T
state<=Idle;2 s: q: f5 t& x8 t$ I# t
K2<=0;0 s/ L( }- R1 Q& C6 d
K1<=0;
' E% w& l0 R) z% J& } T end7 v$ x Y0 `: I5 V) Y+ ]+ h: B
end
* d9 A( n3 G% z! ? Start:: S s4 j, x) ^ [% n& j8 z$ |
begin$ l: w, _/ v( r
if(!A)4 X1 H/ O( w; ]/ A! A3 S
begin0 k: I3 Y: u3 N. r9 u1 h
state<=Stop;) a: O4 x& t/ t/ P$ v! k4 C- P8 h7 b3 N: l
end
% H$ Q! P& a m3 I: G else
: s. F d) p+ c) @. | begin# i3 c! X# t7 b
state<=Start;
; q- _% E& c( I# @6 B( p end
9 w; M: d) z6 [$ z) v* X& f' o" _ end7 F: l- E. {8 ~7 P: n) [( F* w, `
Stop:
0 y7 B# |" Q. N( T begin1 ~4 B9 [$ Q+ X; f; |
if(A)
; }' S' S! S4 i+ y6 R; ~ begin
' L, D6 F# w' w: i+ `8 N! I state<=Clear;
1 F( R M$ P1 a( m K2<=1;
. q/ Y8 D5 C' g2 I' [5 m. b( F end
& x* g! R7 y' ?+ A& u5 m# J else$ N6 E) o! s1 ]: {
begin
1 G! M9 f% I/ e3 e state<=Stop;
1 {8 H+ z4 Z$ ]0 y- N: R* q5 [ K2<=0;
! ]1 D1 z) {( x! y0 u& y K1<=0;
" B" v$ Y) M5 ~ end$ V8 o2 W8 `! J. F6 d/ ~
end5 c" N4 o" x* a# ^' I4 P
Clear:
$ n9 c( g) Z4 |) z5 P$ e: ~2 b; X begin, @# x$ A9 [- ^9 ]& S1 I
if(!A)
( w" M( \* o Q( G" W8 P begin
7 o d" g3 _, A( M% g$ ~" V( V state<=Idle;
( f: V3 ~5 k& g3 C0 N# k. @3 j1 O K2<=0;7 i* p1 \5 M, m0 y
K1<=1;
, D& B9 m; B1 u$ @ end8 ?- J* m1 d3 F" L
else
3 s# A p |( c; B( S4 g begin! y' [9 U) }( J6 z
state<=Clear;
$ u6 O! Q T% x0 `- k$ U/ j4 X! t K2<=0;, X# L+ ]# n- R& F7 S; U
K1<=0; / t4 D: B. C* \7 Y) o! z0 M
end+ S1 Z, z9 h" M6 v8 W
end A3 s$ l) K8 l D
default:
4 E4 b# s& S- A- c- A! y; I' ? begin
5 ?% F, {3 h( ]4 E" U( t5 W$ P! S; o state<=Idle;$ @& F$ u' J1 U9 A' D
K2<=0;
$ x$ a8 D# l# h4 `' n; K K1<=0;
- \; D L0 F; g6 g1 z- b. Y( G end
( U- I$ W; j \" S endcase
$ I4 Y0 f% r7 c F, T( _ end
+ j6 J' g0 \% v8 z# @& _end0 ]1 T% F& V4 b1 \/ _& d# w
endmodule
) |9 r* B- d5 ^) J! A& Y6 y/ H8 B+ V2 j3 e% r- i3 k, _
2.源代码如下能生成状态转移图
3 q, O# L" o$ Y" U0 o) i" ?module fsm(
4 U) [& S1 s6 f6 d$ Q- ?1 ~
4 m! J g- i7 h4 m5 Yclk,$ c) H* g. Y( H8 U$ g
" X7 Y; e5 m; j: Q& d* {0 ?reset,) h& ?* e( i+ C
! x8 |* ?: Y% C+ n P1 S
A,- U& s1 {2 P# \4 f0 D# {7 H: V
) A1 o, O7 J- B8 r4 o' \* f# c
K1,0 {6 D% |& X4 N6 p& Y
& m, R) h3 v% P% S5 H v; U7 B; y$ Y9 C5 F
K2
/ r1 f/ v& ?: j );- C' A1 v0 `- B( u3 X* b
9 t& h: g3 L/ G0 v4 W+ n( F
# b5 Q* \" g' x) o- q: V5 h: Dinput clk,reset,A;! h7 u: T- X8 q" A" H
output K1,K2;
% s/ y7 x# k& A2 n2 ^7 q
4 ~' r1 o* | d) z8 ?reg K1,K2;
8 G7 P+ d* t! \0 K; z8 L' freg [1:0] state;
1 t# I- U7 l# @- z* c4 {3 c6 P. H8 C8 j* R; p0 o N. d' J" i
3 c8 H/ Q j/ h( R$ @
parameter Idle = 2'b00,6 o, ]6 d6 ?3 d
" P8 \& m" B: C3 u7 h3 Y6 `$ {
Start= 2'b01,, \; q* o3 E$ @3 s/ t! E2 z
; @" l. p: b( D( @4 p2 R# ~ Stop = 2'b10,
7 c% c6 p Q; x: y k
( V) K0 ^9 g2 g6 F- W$ [ Clear= 2'b11;
0 G* _5 Y9 H- D p* D2 N( O) `
0 |: P: U5 J1 ~
1 A q8 s: [) |always @(posedge clk)3 k- X8 W6 Q5 l1 I- g
begin
! r, m4 v% p- d: }# G if(!reset)
% X6 S7 l+ \0 f, D( Z( o begin, r J1 k4 m2 y6 L ~
state<=Idle;. F% r9 `5 w% r$ F
K2<=0;4 X: Z/ j% A% D+ _* j" f+ R
K1<=0;2 u# n4 @7 d) J8 K# a; t- ^+ `
end
- q; i+ D9 |+ V7 q7 C# ? else
1 n0 |( s3 s, H9 I3 n! v3 G! |, l- S begin
: l6 e0 _' u+ j- a1 l& Q case(state), O" p8 Z B. C! S8 C/ q
Idle:: i/ ^; N4 o* H3 @9 y v. T
begin& S+ N1 w+ y- Y# [
if(A)9 t& m/ v- m, P D) p+ @
begin
' j# O! L- }2 y4 X \( b state<=Start;
6 x t2 i4 l1 b" Z K1<=0;
# I+ B/ b. s5 p* |# z end
# `2 a* R9 g# G0 T. z) {9 k; ?( D else5 E3 _( q& m- ^, D! X
begin
( x7 B+ g) `4 z; d state<=Idle;
6 z- u$ @3 }$ Q. D7 C: L K2<=0;
6 S2 w/ u: _: n K1<=0;& a. A J9 `& K/ ~* _
end0 U' |, J% v( [$ d, A# l( g% b
end
7 o+ B8 ?+ Z8 U# w Start:2 G9 U; z' g6 `4 K q. S/ f @3 v
begin l7 A# P' S+ K6 z
if(!A); E' g8 i m& i; R% I# ?
begin
1 C b9 @; D/ j% s! m& G state<=Stop;( E5 v# {9 N4 m5 |5 [/ s
end
6 ]: u+ Z( f. e else* s7 n# l- B- N% [& t9 ^
begin
+ c6 [7 V9 J8 T) w- D: U; `' X state<=Start;( A' }4 L5 m) r+ f
end. j. a# J8 H7 N) p
end
1 z, Q" D3 d7 i, z/ k6 n2 a Stop:
( c* m+ Z# i1 I1 G+ r begin T! u# D& @8 Y/ ^
if(A), z! J1 `9 e+ Q/ ]4 l3 @3 r
begin
7 i* J6 m5 l3 {2 J1 O1 w state<=Clear;3 N( K. k8 p" E6 q4 f
K2<=1;
* U$ X+ S, G" l- K end0 A Y3 G, D& D6 z
else6 T% ^' o0 o' R# `
begin
8 ?' j/ ^1 Y0 D, P state<=Stop;3 I u" S0 C# Y
K2<=0; A3 C( o+ @! {' u( b
K1<=0;) f+ [- D- k5 U2 H6 m
end
9 ]$ E9 j, h1 R. q8 w end% ?- i8 f' l% z9 F. S8 ?9 z' }" H& r
Clear:
, v% D& j) r9 Z( W3 a. l begin
7 A! }; x* `7 L/ [) T6 S' { if(!A)- p* I2 M* w+ I: Q- ]7 k) j
begin: T5 B9 _7 X& w f8 U
state<=Idle;8 V9 N' l" F& w) w+ A
K2<=0;
( `, |" x$ o$ H( |" @ K1<=1;
3 y5 P% e6 }- g6 y end* l* f& \. i: [% w; h8 ]: C( p# [# U3 E
else7 G' Z6 U2 \6 \9 z$ q) i+ G& n
begin
4 [* [" |; H: O/ s5 b6 K. n7 Y state<=Clear;
6 ^# D( N: q- d8 k K2<=0;, t* F- K$ R3 D! E1 S/ l
K1<=0;
. g9 m% R: m3 f: k4 b end
' @) M, j$ F2 [. m! K3 H end; O4 P0 \' `) Q7 j
default:2 c" X7 @- _4 b, Z) T. u
begin
8 D) H6 P4 k; Y2 v' N2 ?# ~3 j state<=Idle;
/ R2 a$ ]7 ]: U" P& S% Z# j9 s K2<=0;
7 t- {* ^4 k+ F! T# |' N: R6 J K1<=0;
/ f% ]6 S: k2 \ w% R, W end' Q0 s( s* Z4 v; o# f9 _' W
endcase
" I, ^! s2 x/ Y5 n0 I3 _* m end
8 Y# l9 c+ i Q: r, M4 ^* Dend
2 I8 s C4 Q' b5 t9 n2 Kendmodule1 i- }6 t! }. D" C/ |
; L5 e2 K% m9 E, J2 w5 V) U请问各位大神这是什么原因' C+ {" P% q4 b& b, ^
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