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1.源代码如下不能生成状态转移图
' X3 s" E0 n4 L3 |/ Ymodule fsm(
0 w; Y) x. @+ L0 s$ V; x. m3 `. [3 Y* i/ p4 B
clk," J4 j& ~" }! R5 ?1 o# i: X6 Y
! B( f8 r% h1 F1 M8 N D8 E% `! `
reset,( v$ b# o5 e! R8 {1 [/ q; n' ?4 S
9 B* ]! j' z4 t1 Y" F8 [$ S: iA,, C3 j( X9 @% u8 ?. e$ [! ?1 I. Z
4 L- O1 y2 L$ f; G, D) e2 AK1,5 j6 F& ?' o @ M# K9 l6 F
. N8 s0 _: Y$ UK2,
- |8 K! e; R8 R4 j3 }, C# v8 g2 ]) G$ R8 O) }
state
6 b' v4 }: x y7 o9 [+ m* ~ );8 B* p3 Q8 [. d5 O5 @8 S3 G) H
. e3 S! `7 c6 @# R; @, i
input clk,reset,A;" K6 D+ J4 g) ?% R! Q9 M7 x
output K1,K2;6 s' c9 u; u2 }9 t
//output[1:0] state;; a* S* W2 T6 N# H3 t. e9 i4 z1 c
reg K1,K2;; L3 U+ L3 A, H
reg [1:0] state;
' \; W8 O9 E3 r v. G& C) D1 h [; q# Z- O* C5 A8 t% }
parameter Idle = 2'b00,6 a" C7 h# f! }
+ e% I9 d& p4 p! p$ @6 Z
Start= 2'b01,
2 }( T) h& m" [% Y; z+ s3 O% W7 t
( \- y/ U5 ?; l; p4 d% l& |9 T- N' J Stop = 2'b10,
4 X0 _+ H/ q6 i! K( I; j, H
, F. X$ k$ \' v1 |( l Clear= 2'b11;
) L; a, z" Q4 i! B [, [
* P" g L' X T9 S6 C; }: T0 M " Y5 K+ B- k- y- v
always @(posedge clk)
5 N8 l/ r1 l7 T7 u8 a1 r$ Nbegin2 D. U6 G+ x# m" |
if(!reset)+ K5 o# C/ W2 F
begin* r, @1 Z. a2 R2 u5 n9 |. a* l$ Y/ g. L
state<=Idle;
/ @' I' `$ u% |1 @. [$ h, M K2<=0;
9 M X) t) o9 S& H' y K1<=0;3 }5 }! n) i/ `/ O. I; R
end$ k- G+ Q$ b1 i
else, N7 ~; X* }9 w+ _, _
begin1 c" e H* c- w$ k
case(state)4 _6 d @8 W; z9 e, O- Y
Idle:
$ }; ]% W& B, g6 z0 E7 V0 \3 v begin/ D6 s9 j( }/ N' H* ]
if(A)5 U4 m; ?! o( i3 t/ H# ~: \# U- w
begin1 a+ b# w7 S( [$ ?- C
state<=Start;5 ^) |9 |9 v! Y
K1<=0;' o# f" p' b' W# U
end3 l+ [& P; c' K/ m8 b" O: o
else
0 P8 P2 r/ b; n, l* P- B# T' S begin
9 J" _' O) r: U/ v$ n g0 |% ^. e state<=Idle;
, c, k5 x' i9 x+ E3 p K2<=0;
) M- h- v% v7 K5 M K1<=0;
( [; |9 @/ N9 M. r end
+ } _+ X% y9 M; P8 L/ b! j1 o% o b end( I5 O0 J5 n7 Q; n, t& w
Start:
' m7 n& U% ?5 l( C; r, ]( ]3 f |5 N begin
- k3 T) C9 M! B8 C# V if(!A)
+ z- W5 ?: @$ z begin9 X: y1 P; ]; R2 K. e; J- T7 m
state<=Stop;
6 z6 T r7 L4 ?; k$ s end+ _9 z4 g' H7 f g
else
* v3 Y! @$ u# J" j) w begin
+ F" G1 [9 S5 x0 I state<=Start;5 B$ r+ l% o/ e& p' |* _5 s( b: M
end
; ^+ W' j$ f+ L/ C4 |4 l end
z3 P% a3 r4 K6 S, I6 z: | Stop:
7 {) M L7 h. ~ begin" c' r, {: k0 ^2 }: O1 ^- O
if(A)
) D: n- Z2 t( n3 W0 { begin L6 @) L/ [1 t% }+ q
state<=Clear;
2 D2 \3 O- ] C+ g8 z K2<=1;
7 ~: U. o5 C2 o' g. c end7 V& [0 D1 C: i* F, w3 }
else+ l# U- a' Q8 y. Y- E# K/ r: u
begin( s0 m+ N9 I5 h, d. Z
state<=Stop;' A8 B8 c8 d2 l" M3 ]
K2<=0;+ K$ S( [ L( ?$ l1 J/ R4 J! D+ `
K1<=0;8 ]0 b! v# O* ~) t- m: f
end2 f) E9 W* f' T; ~
end
$ V3 s8 s: i% q o- i: |) V Clear:
8 p W$ ~: l } O1 K begin
9 n9 c3 V+ P+ E$ Z2 N0 H: [: I5 R if(!A)! ~% x {) K( i- j" f
begin
0 Z# d& K: {5 Q0 I state<=Idle;
2 ?/ n# F( e+ `& v1 `7 T2 f% ], | K2<=0;. Z& Z8 I# [+ o t$ l5 F5 r2 r0 D# w* C( q
K1<=1;8 D+ A6 K% U- k7 t! k
end
; p0 w+ X6 U4 q/ `- q; i7 m5 _ else. @+ T3 j1 K4 y) q( e7 H4 ~7 s
begin, I5 r3 i7 ]. r
state<=Clear;
" Q: [7 T6 c' @ {7 q2 n' x K2<=0; m$ ^) r5 X e+ f( O0 k
K1<=0;
G6 P, ~+ F& d2 H end+ K' h* j! x4 w0 [) d+ [; [& A' z$ _8 ^' p
end
. z1 `& C! m X; \4 p; @" ] default:4 r$ P% l0 ^! K' h) h
begin- f9 K, ?/ v+ z6 s2 b( F
state<=Idle;% L g1 s6 F* a2 ?' w1 e- [
K2<=0;
$ C* J! F2 G0 _+ K1 |8 @ K1<=0;7 v1 D5 t* i# d8 |1 C
end
& R+ r2 f- {; _ endcase
5 g0 W$ q; | ~0 U+ h+ U end
C! W7 Q0 O8 iend& U/ |, k* T+ H( Z3 c1 Z8 T4 n! m" m0 j8 B
endmodule
1 h. r" Y' x; A2 E& a0 ?+ g( B
1 P! m6 D* d4 G8 r; F2 R2.源代码如下能生成状态转移图" N8 {0 S" o; T& E, v' o, n
module fsm(
|, t2 \. ^, A/ L* C* e. Q" f5 N2 p2 j
clk,0 M9 r9 u7 I1 w/ U8 C- Q/ b9 S
4 L" B9 G' I- z! h
reset,
w4 y0 w5 x0 s! [; `9 B7 K& R- h
# g( e/ @: O$ |1 w" B- _A,
- o* ^# n% ]; \( Z" y) Q; L" Q. ~6 ?1 q2 h: ^6 Y8 k' K, v+ u3 n
K1,
/ C9 o7 H. {' u* H6 {& B* I X) O+ c+ |! K3 E: ~2 {
K21 g8 }9 o+ q9 L% G) o0 ~/ {
);
% P+ N* `$ c. I) Q# [# p2 h! _. O3 i6 Z0 Z6 I9 K8 `
5 @ Z" E4 n9 w9 _input clk,reset,A;8 M" e" N, R6 Z) o/ G
output K1,K2;5 D3 ], `8 E! A: V" R) o8 |& z' V. l
9 ^% a: Q: b* P- e4 `
reg K1,K2;7 g% K9 L8 ~3 y+ a+ l& k' I1 c* }$ @
reg [1:0] state;' \ ?; W! A' W1 ?3 K: B, @: m
* Z6 T% a: l- h; H' @. W
& f& s$ c' u$ E; A4 Pparameter Idle = 2'b00,0 I$ @6 g2 K" e. a
# p% R0 x5 I% j8 Z/ @
Start= 2'b01,, q/ ~+ s: n& _$ Z, B
! [: w# X5 B0 O/ K
Stop = 2'b10,; J$ z+ L# w6 i& v
3 ? a: q4 }7 H6 _/ V; ~ Clear= 2'b11;
' m' v3 H5 C( L2 A5 t$ |1 ^# x; B4 `! W5 I |# Z- O4 N s" X
) Q! I1 q h% ^& P6 o( Jalways @(posedge clk)
4 l* G" w' i' d* W- u4 _begin, N# ^( I" H; q! R9 e+ G6 B0 C8 L
if(!reset)
& ~5 ~6 s6 L4 w E" z( j begin
1 R3 u& P* i% I; |- A0 v state<=Idle;, d2 r2 V; t" {: T6 V, c. B4 L
K2<=0;
+ o$ t9 M3 s u0 z1 f, {1 h I2 V K1<=0;- _& x0 }) I: w+ _7 ]2 B8 B
end
, i% r7 i) X, c* n# G4 V6 a else, ~5 u S- i& }! r# ]% g
begin
# P3 j- T1 F \: Z% r/ a4 e9 P2 Z" E case(state) g/ t2 R, X$ |' ?' M
Idle:
, M! i, b! ^: H1 O begin
( x# j# e9 _' w5 [/ U& Y' J if(A)
& p q% N6 B3 q begin
" `& P" _3 ?8 H- A7 G/ F state<=Start;2 a: m$ E. c. i' |0 I' J( ~1 V
K1<=0;
% I/ W9 P; b7 |" ] end
+ I% f t5 X; U6 W: |6 v! F; j else( W: {9 k/ x; V! W! ^8 I0 Q9 e9 {
begin
8 o& g* P u2 M1 ?; m, N state<=Idle;
4 Q/ ` N/ E8 j9 @% Y K2<=0;
- |5 C7 v7 A3 f! m6 V/ @ K1<=0;, h; W6 o' Y6 w& W5 _* V8 D$ Q
end
; M/ _' X e5 X4 p end' l+ T- Q/ D4 B% v W
Start:
& k9 V% }1 r* Z* }; M; c begin& c4 C# G) G2 T0 c: y+ l+ ~; S: }
if(!A)) P" B8 \1 s/ p& c3 p. Q6 V
begin
9 S4 I Y5 t8 C state<=Stop;
: l; m) A# R% }* s( \: A& y end' p! g5 a9 R$ S1 p& o7 Z, Z
else3 x, z& K9 }0 r
begin# |( V" S% e, [; I1 H& o
state<=Start;- g8 E2 t4 t4 s+ t0 P
end. `% Y5 R; D. e
end9 v- d4 ]/ x4 ?; M2 j
Stop:
" s% K0 i' e, H& q8 y begin* O0 w( }1 y" f# r) R) x0 i
if(A); E S! M/ P' x- Z! q
begin
2 X" n0 i6 ?0 w" S. q state<=Clear;1 C- D' u2 z* ~- _- K; r4 c$ n
K2<=1;" u d7 d: K! _, K7 @3 \
end
1 s2 }. q( R/ L7 l4 v1 C& @9 _ else. I. S" N# Z' W- Z: C
begin
2 e2 \. x7 ^ y. ~/ y state<=Stop;
. W8 {" }. y" Z- t- y K2<=0;
) d- R7 e: Z! N! b5 Z. w. d( K$ g K1<=0;
/ F' x# O+ S5 ^; g& ^* F; Q/ X end5 n5 g2 j% S1 k- h" i
end
: x9 Q0 P0 m: C8 G) Y0 i/ N/ Y Clear:! B5 i8 i- L. _ |
begin; I! E) I' X, ^7 f/ T
if(!A)
& N* q1 D; j- I7 R3 N( J begin
# A, B- ~! A" H7 Y state<=Idle;- H2 Z8 ^! s; E" n
K2<=0;& F3 e- L( J" F) _% H6 y
K1<=1;
9 l! `8 b% n) U/ C- P end
! C E5 S4 }5 r! V9 R7 N else
7 h, i% o) |' }$ |4 P5 j begin1 I& e3 v( v6 s5 z9 g0 ?
state<=Clear;
" P6 @5 d5 N7 |+ p/ t K2<=0;
0 g( T- C& M: M) L% _ ?$ G K1<=0; . w( K4 P" @% L9 a0 v! |
end
) z" ^ z+ A g+ Z8 T- k/ Q3 U% K end/ p& S* x+ }+ S+ Z+ ` Z
default:
5 T" l: J! x$ x4 m. S* L5 ` begin
* H6 j4 u6 Y/ J! R/ M0 _ state<=Idle;0 I! E) C# U$ K- P" ]
K2<=0;
, l0 l7 K7 ]; j- R K1<=0;
7 U. F- b/ y# S) k" z end
' U( x: u; D4 p( z, Z; K endcase 7 ?" g; @, _ [/ A$ r) a
end
9 g+ A0 Z3 n$ q. a" oend9 }' a7 B' w3 c
endmodule" R1 F% V3 J ?% q
, c$ {- j" K. O; e
请问各位大神这是什么原因, e2 ]# X. s! w: s& d& e
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