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1.源代码如下不能生成状态转移图
; J9 J( N" ?' S; h) Smodule fsm(1 {% I) a- n; {. V( I
: z, u8 L+ M* x$ [clk,
( W: J# m. k3 T" q) e3 f
& H& C6 ^7 Z: Z! }9 Z ureset,! n0 z- d: l! s* r8 m5 e
9 a3 U* w s5 ]9 O2 ~5 I! d
A,
4 n: l0 y1 \' R3 Q& g$ L; \
4 [4 N9 z' f4 `+ c( S7 ~K1," {0 ?+ o! R; Y1 ?# P
j( i) L- M3 HK2,
) N. ~5 D9 g9 m+ Z g& {' @- l- i& k! Y$ S
state
! s" ]" J. x( p( o, F$ _3 W j );
8 L2 _+ z& I2 |; I8 X, ?3 F6 |7 _( o' z! d) I6 S2 x
input clk,reset,A;! }2 c8 ` q; x; d! p2 m$ x5 z, ~
output K1,K2;
0 n' {) O( g- p" x8 x( a* z7 g6 Q//output[1:0] state;; l+ z) T. `# g
reg K1,K2;9 \0 p( D( u+ @5 p* p
reg [1:0] state;
- x7 H0 x+ [# j6 r7 c
0 r& |% T1 x2 k1 g, jparameter Idle = 2'b00,6 T1 e% x) g2 X+ w9 ]
6 i% ?8 r" f: K* h% X; h
Start= 2'b01,
4 z" s8 O6 t! u' O" q, k5 t/ d' h' q3 v
Stop = 2'b10,& ~3 ?( {0 z7 [
5 _ _ n# g7 ^+ ~; q) O Clear= 2'b11;
+ Z+ B6 J1 r! T% Y( \- ?. E1 L/ a2 `, J1 w6 R6 j
8 ~8 |+ S5 W* a1 x" g
always @(posedge clk)4 _7 }0 j+ t/ X {% P- z
begin
* |4 l' M5 R p; P% ~ if(!reset)
% m8 E8 x# d) s" c+ X begin
]4 k' C2 Y+ Q# Z% ^ state<=Idle;
1 r! W9 E) V* x8 k+ H K2<=0;
8 T9 e- k) A0 i- k# [/ H- F K1<=0;0 M) E4 e+ q. j3 q0 I
end* H* {0 j; _: n d/ F+ @
else
9 L0 M; _3 i, ]' _ begin
: g! V* F" m! L* S, W, p case(state)
! V9 F: f7 f9 E7 n Idle:
3 y8 B2 b5 r8 k& |' g2 [ begin
: r, R r& M6 A. R) U2 @ if(A), q' P/ o4 L5 o3 \! r1 Y" |6 G" v
begin
: r; h" t ?' ^1 S state<=Start;
/ l$ \8 k& f: K' K K1<=0;6 H, v7 t( x5 P/ ^
end7 W0 C* f( Q8 r a& C
else, d- z& H3 N5 _. g7 ]/ |9 h
begin( N0 z' z9 C5 t
state<=Idle;( z2 I4 G( K2 A9 P8 w
K2<=0;
, x- g3 y% E+ z9 b/ M K1<=0;) |% z( K9 o5 A& a
end! ]& ]) O9 Q( N6 W3 x4 _% i# ?& a
end
2 J2 E) i0 t" o7 K* Y; D3 _, V: ] Start:% Z% y" ?8 z2 q/ W
begin
& B- A2 x: ]5 k) d1 }- | if(!A)( w% A5 O* B% ^% e5 B
begin: g4 ^ s; F$ f D
state<=Stop;
- j, i' k2 `8 o9 l) S$ |) R' Z( \0 X- M1 ~ end- R' a1 n$ F- H* H! P
else1 i2 }1 y1 X5 O% ]
begin
$ \$ s+ d2 H3 S: n; L state<=Start;: X6 K/ X3 F. S0 O; ^9 F; ?6 l3 p
end G) Y& Z- s/ P0 K% h
end+ h: Z2 r$ y! z6 C- Q
Stop:, W4 e, F# t4 D1 m
begin
1 O% z) E8 V5 U9 k( O/ B1 m if(A)
6 j4 k0 I9 }8 p8 ?: Q. I1 O begin
9 r2 h* ? L. d4 B state<=Clear;
4 A# L. I# I5 o4 y1 m K2<=1;, W. Y/ K; e- o, l, Y
end$ x8 A* w2 H5 G* j( Z; A7 J
else
- E" }& F6 t$ H begin5 p- R( [3 c9 a- U7 k) W
state<=Stop;
% ?, y& d! m, s4 B' H9 i& y K2<=0;. y8 d" i" j9 }7 q9 I2 q5 l
K1<=0;: e2 {8 s- _4 Q* w4 k. O
end3 n$ W( {7 Q% y' ~* |+ k2 c
end
' \; Y9 h! C- m Clear:
& ], `& G8 T2 N3 f' S9 P2 y, F. Q begin8 L, X; w( J% q; U" U- r* {5 q
if(!A)5 E; U: ~7 H. l" G6 h
begin% ^% L6 R, M* H
state<=Idle;
1 B# ?$ r. R* ]' c' R) {. _ K2<=0;
6 t8 O0 Z, Z5 @2 N: e Z- @ K1<=1;
3 u) r9 [8 M' r! g s end
# g3 h& D$ v6 l6 G, e' G4 n else* G% ~/ G8 I1 ?0 s$ Q" {) n
begin
& w1 M/ f0 l) a$ k p4 J+ Y state<=Clear;5 L! u+ D9 w* V' _; Z: `/ E
K2<=0;
- ?8 J: r0 K0 U, G! ?: d. a0 R K1<=0;
- @1 X/ h4 B7 A$ I) t! ~6 p end4 i" m+ b$ ~& _( B/ r" U! O
end) ^9 q4 Z. i) A5 L/ _9 G! }& ]. X
default:% l( `" H+ m, u
begin
- A/ w* O. i y0 ^( J state<=Idle;
$ B* Y- F. ]5 ]6 F, U b9 L K2<=0;6 g6 a9 a& c8 z
K1<=0;
5 h6 F* w& N2 u0 g end
S; {* v1 L) R' |1 w4 ?/ o endcase
& f& x& F% s* u5 P. u) I end0 O M1 f) j5 _( w# i
end
6 H( K1 Y9 g; P: Q0 vendmodule/ J' K, K, O+ O0 Q
7 g2 Y g& O- e* \
2.源代码如下能生成状态转移图
% H. k- w' i% a2 Fmodule fsm(
- U+ o$ j9 K+ a0 m4 m$ O% Z( X- F- j% }# S3 b
clk,( G z1 U4 ~+ o U2 m* t; ]) ?
- Y* B6 z# L7 q' k% J) \. y, Vreset,
& T5 Z7 e Y! q w, t% l5 d
# u. e+ ]3 Q& j0 U9 UA,( V7 i. A- J9 z/ n0 A" o1 N6 o t
+ h% ^/ M; V+ T1 ~& I# d6 q
K1,
* Q2 ]! j1 A1 C
- b3 L+ `- j' V/ `" |K2+ D8 T \3 S4 {7 ~1 \. p
);
7 |! R) g5 L' `0 w: A) w3 m, }
% O1 n6 z& S3 J/ E8 k4 L+ Q
9 z: O$ z0 q; a' L* w& dinput clk,reset,A;" R( G, k- T4 w5 o
output K1,K2;, N9 M, o1 N. s2 [' y
% @0 b7 M8 A1 [& i9 E) [7 C
reg K1,K2;' P. l' w/ T& x R. i# J- m1 l' e5 B' d
reg [1:0] state;
2 l& m: B0 X/ e4 P( F
$ T1 |) N: T: S. D5 K2 [7 W( A$ t. u) n0 i
parameter Idle = 2'b00,
8 ?: j7 u; Q; l" `0 A! N( f8 W Z* X- r
Start= 2'b01,
( F5 V# r& w4 s) V, {0 \3 n( f8 w* Q) u) H! m# a- v- v4 L. i7 D# J
Stop = 2'b10,
$ t2 T+ P3 k6 b9 l% k' _ d2 f1 Z$ X9 p m/ Q$ `$ B# P
Clear= 2'b11;
# @9 @/ |. p! n( ?3 ~9 S
* m% H$ b( G8 H5 ~; y, }
; ?8 c- B8 n& f2 x) g! balways @(posedge clk)
5 ^* Y# h; u" z9 H: ^" qbegin
( E& ^# M( ?6 ~ h+ x if(!reset)- h$ f0 r" a7 F9 V' J1 j
begin! ?. K& s* K5 H; c1 {# |/ i
state<=Idle;
U! F0 o+ T1 b9 l K2<=0;0 G N& j7 C& H% D$ u
K1<=0;
: F ~8 R, T% h end
, I* Q% |- {6 l k" G else
4 ~0 K6 H' B! v# N( x/ D t- x begin# S9 q5 w3 z, ^" d
case(state)0 T3 K9 a$ m( R& R
Idle:
/ S) s3 p1 P8 L& K begin
0 V, _% q, P; _$ o8 L# D if(A)% e8 b, n* y9 l$ j
begin. }( Z( h8 @" a
state<=Start;
) J- |! o# b( y K1<=0;
1 u7 R6 D" I0 m8 m end
. q, b! S/ s+ _" h& P else& e+ K9 B: Y, \3 {( |
begin
$ O7 j$ G* e# w0 V: Y! { state<=Idle;
* t& ?% E5 E5 p' \% O, t3 G/ h K2<=0;
! y8 ^# C, P9 f, S; o5 B K1<=0;' ?( @" R5 y+ W$ i% k
end
" [( c7 n7 m, N0 I0 Q% }6 N! g end( @5 c7 a2 Y9 W4 n5 E* g" o- {# M
Start:' l3 ~ L' W0 _! ~
begin
3 ^9 }; a) B# `$ Q+ F. _! |7 }+ X if(!A); j3 G( M: t( r" ]0 j" N z, C
begin! A5 s& |* S1 d. z4 \) ?) E& q
state<=Stop;" P$ k; D) q* s& x; H! Q
end; u* B! K8 b5 Q8 V+ \
else) Y2 d" l$ \6 m1 y) E5 [" _" [: S
begin# V0 M4 a& ^0 @) I
state<=Start;) [+ H/ b x m' c4 V
end5 s+ |2 q1 M+ t# \
end
u- A; v6 F: w; C5 L Stop:
/ f- f7 {) L1 P# n" Z* f0 k begin: d6 |+ V' f; ~& u- U$ N. s7 t& s
if(A): n- J v% ^7 Q; F0 l+ F
begin
9 J7 J5 D8 n @4 i1 {5 F! A state<=Clear;3 t7 y7 C# w7 I. _2 H
K2<=1;
& t% s$ I' ~$ _9 F; E0 m3 y% J end
( Q; b2 r( e( ]* s else+ o; ~2 S& j7 X0 V9 [* O: n
begin3 [, V6 v* C& f: d% A
state<=Stop;
7 ^2 a5 h. ^6 P" c" V1 _% } K2<=0;0 S, Y: F" s- l( ^9 A
K1<=0;; V9 Q- x- {+ I7 ~3 R
end
z* h$ x3 r# k9 S$ S3 |% m end
0 ~+ Z# e6 P- O; j5 U8 Q( s Clear:
% a- ?; D, z# h1 @- e6 J begin
! [0 r& g1 X. [) h+ c if(!A)
% u/ x2 V0 B5 \6 S# d9 i' H9 ` begin
8 q3 v& B+ |9 F. U8 W state<=Idle;# c0 p" Y" |5 _6 i" O- q
K2<=0;
. F. I2 h$ l1 {+ J* ~ z' m K1<=1;0 L, o. e* ~+ l) B
end
+ N; l- k" [7 D. e" ^3 Y* d' U) p1 | else0 p a( Q: R$ ^- t- j
begin
9 j! I! E$ y0 w% ~) W state<=Clear;& a0 t( ]% @8 L; c
K2<=0;% K2 H: ?" H4 N" `$ D; F# E/ U7 Q
K1<=0; 6 p0 c5 B. ~. {* m
end0 `' j/ g6 O! q( P( V
end0 u# W+ \; i" r w D6 {
default:
, ?8 L1 @- ~. d begin
) X* p+ O4 {* J/ l: T state<=Idle;
/ _) g2 g+ Y6 p1 ?3 J. q K2<=0;. |: A( B0 @2 a7 E; i4 J
K1<=0;) H/ Z/ B8 r Z0 ^, f/ m
end
3 m+ S) Z6 K3 W. d7 j) T, j1 } endcase
* h5 _) y: o% e0 [2 a& W3 \# ^ end
- z' p0 F; Q$ p; T4 Tend6 _( {- u' U6 P( w0 I3 F
endmodule
9 u; P+ Q# o+ O0 r$ h }2 w ]6 I: f- ]" ]# b( _! B! @+ O
请问各位大神这是什么原因% P- K* I: f4 u* f4 |/ y
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