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1.源代码如下不能生成状态转移图5 k; Z* Q& [# v( r. x' q
module fsm(/ \9 o% G V/ h; g+ K7 d& B$ P. k& ~6 t
5 c' u c+ ]( m# xclk,. Z2 ^! g% [9 p$ r' A' B; ]
. X0 H* [+ p7 R8 K6 j
reset,* z2 _0 K; l ?# C* r4 ^) D
$ H7 p8 K5 u7 XA,3 J( K3 V. p3 n" n
1 o9 L3 N' [3 I# i* y$ _: wK1,: w$ n2 ~5 v" ?! q1 W& T# W' X
5 c6 ], g+ s/ N; S- G( g
K2,
& T; Q3 C- R2 v3 b; ]; J2 e% ]' e0 X2 e- H" E
state: K3 e: x% I* S. @3 Y
); G- M: D6 {0 H* v; w
! L1 Y; B" w+ pinput clk,reset,A;; D, R9 D( w3 C0 h O1 l Y
output K1,K2;
8 u" i( `/ l% {//output[1:0] state;
/ ]2 ]6 |6 E% ~1 sreg K1,K2;1 R4 ^; O; g- X9 n! X7 n) j2 f- M
reg [1:0] state;5 d) C+ ?0 C% ~6 T
2 U/ D2 x$ P4 ]& y* aparameter Idle = 2'b00,* }4 w1 k# g2 _3 H- a( o( ^
0 r& m0 g$ s6 `4 o8 [2 P
Start= 2'b01,
& \! Z8 {% P/ T, ]" `/ K2 l/ E) v# ^* e5 E+ x8 a6 [& w. [
Stop = 2'b10,
2 P* v% {8 d5 y8 W
/ Q$ R; ~8 A1 K Clear= 2'b11;
3 g" c6 N' h, D; W" T' g* c% ?$ o) c, i! F: t& X) V v5 z" \+ y
9 @: l2 R- r0 T: L0 R9 {
always @(posedge clk)
2 q- @/ O! _1 L3 i, J( C5 Wbegin3 d6 M6 u1 ]! d5 h
if(!reset)4 `6 ~ T( M+ ~ R8 U2 x- R3 w( S/ M
begin
* e3 h0 A/ D% c7 B state<=Idle;& J& `/ R1 Y. l& ]% b
K2<=0;: O$ D( O, r6 H. y, }/ |6 a
K1<=0;" b8 D7 B: u5 [6 d
end* n( d7 {5 F* j0 I
else
1 D5 [( y! J0 Z4 D begin9 w7 [ n( B' O$ D# o+ G; K
case(state)
' [; J9 H* u( ~$ | m1 \ Idle:
, |5 N0 ~ v$ ]7 ~: ^0 _ begin
% Y6 K2 p: Q+ N+ [ if(A)8 j9 p2 j4 X5 z" N% ^
begin$ R9 }6 b' x) ?' Q! O: j
state<=Start;
4 X$ k# r6 J. ?( Y' y5 g K1<=0;- R1 L% t1 w4 H s7 u
end5 Y& w4 k* l: k! C
else4 T6 x* Y& G3 P9 c, H& @" {$ }: y
begin
( d, W8 {2 V9 C' @5 T state<=Idle;
/ p7 x! z* V2 e K2<=0;# z$ D* [8 i, M
K1<=0;
' s; @) y% V: o5 o end
9 K5 `% K* s6 b; d U/ O9 G end4 X* i) Z9 R: A. T
Start:
: Z( ` o7 }. Q) `/ J ~8 d begin: P2 ]' y6 k( I l
if(!A)
2 i S. g$ d+ |( f begin3 N: h3 q' w4 n1 H K+ ?
state<=Stop;, q3 z' j, @( Q& t2 V
end9 a$ \9 u1 J+ Q; D( ^: }2 s
else8 }2 w( n. z9 M' u
begin
1 K* O G0 k1 I$ n state<=Start;
3 f: r1 q+ J" A8 Z. q: I9 X end
+ }$ f- g1 V$ |9 @: Y* a end
. I# ?3 c6 V ]) ~% g' U/ u Stop:
+ e/ O; h0 k7 j6 U! i1 `! { begin- m; r y5 }( L0 U
if(A); @4 Y$ s$ c+ I: n
begin/ ^! w7 t/ b) `+ G9 F
state<=Clear;
1 i- k+ W0 m1 L5 p* \" ~4 j K2<=1;
4 W/ L$ A3 A0 w+ O' G/ R end
* S1 P5 f; O: @ else: |+ k P& y {
begin
D0 v9 U- E6 }' Q0 D) A state<=Stop;
! P! t. K1 b9 y# B- ^, M" ~ K2<=0;
* z3 [, ], H; }0 y! a- Q K1<=0;
- u6 d I( C8 E) q6 ` end. g, f9 Q2 T* C3 ?/ ~5 L: t( J/ @: i
end
8 |5 D9 Z3 r8 ]2 K5 g! B Clear:; _* P A8 Z% P" F2 { C1 O
begin
, b. l$ p1 [4 g; Y% H if(!A)) h: w. ?! \9 N) ^
begin
* }- f% ]' \9 ?6 h% ~ state<=Idle;4 i+ }8 h) k$ j: ~
K2<=0;
; U: `4 Q- f9 x6 E9 L4 D$ Y6 | K1<=1;
- e1 F4 G6 U' ^, B k end# U9 j; i0 }+ W
else
* g, |- ]1 ]4 \! \8 C+ t begin2 Y0 |) a8 W$ P# g
state<=Clear;) g" @- H+ Q( T3 H+ Z$ Y, v m' D
K2<=0;
, }4 @2 p& n; y3 m2 }/ @, a( S K1<=0; ) W6 X; { W7 a9 E6 M- U1 C/ Z
end
. L7 p% T9 |8 Z- B end4 z0 y5 H" f! V
default:
& _$ D% z/ o5 }' j begin
n. N) T( T8 y. t1 H d/ x state<=Idle;9 N+ r$ V e' O8 g
K2<=0;
1 |! ]+ M5 i3 u, J2 h/ X6 l K1<=0;
% N& k$ m. o. }5 D5 c* c4 ^: o' p end
8 s5 c4 ~' E2 E# ~7 u) g endcase
( z! z9 r5 |) t3 |* D) z2 a2 S, T end
7 s% e! J$ K$ w7 W! X4 R( [5 Gend+ l& ?, l) p+ t8 j3 {( g# Q' U4 j
endmodule: W4 Z! H' g5 ?; M g
0 A; {( s9 h6 b
2.源代码如下能生成状态转移图) G8 B0 z: w% I, F! k! b
module fsm(
/ a+ O7 g/ K% t1 ?0 T* c' I. k
$ {# N9 Y8 z- dclk,( R. q: E5 C! V# g
/ d" K: e' p; t i$ C0 {
reset,2 ~) v+ D8 O ]8 U( [4 ~
) K* }6 k& ^& R: c' }& [! ?9 iA,* l0 r6 S! N: B! Z4 u
1 i v8 z3 n1 v" J
K1,
5 L z. W3 R) j, \7 g: U# ?# M# ]$ t2 B; N" C/ t4 P4 f# k
K2
; j4 L- Z0 A5 F4 L );" |5 o) F& h+ I. L
/ Z2 b, O$ n N8 ]% ~
6 h6 Q0 W. \3 K+ L. _% A
input clk,reset,A; k# L: s0 n9 E9 ^
output K1,K2;
4 `! _7 `+ J5 N8 b. N8 ?% H6 s& H; G8 A5 F
reg K1,K2;" ?8 G l X# P
reg [1:0] state;9 X6 Z8 e, d7 j; s) Y5 A% O- v
3 [7 _* U4 ~; x- R. I
1 a5 F: J" j8 K
parameter Idle = 2'b00,. ?$ q- m, D1 [6 ^- e, F8 F% a7 M
, t8 ]2 Q% `9 w# H Start= 2'b01,; v# g6 V) B- ~1 w* T( N/ k/ V
0 v4 ~$ n9 d, B- T3 p' O Stop = 2'b10,
. X7 {5 v0 E9 a3 Y1 o4 {, Y4 a
1 [+ s- R# ^4 s- y Clear= 2'b11;
$ V) y: J0 E0 e; Q
. V" B1 c) U' I4 { 2 c6 W, {% v4 v
always @(posedge clk)
8 X% R& u: D% k/ P+ Wbegin0 r# Z9 a v2 r( H
if(!reset). s2 X+ @ L7 r \
begin
; c& U Y7 g2 w& Y$ q9 C* @ state<=Idle;
8 q- c" x4 P* U) | K2<=0;
0 x' n! ?9 B0 |) k# h K1<=0;
2 A. k/ u# k8 b& w: o# Z, k$ m+ T0 w end Y( S. [4 a3 k8 ]- L/ r+ a
else
( | n: o! ^# \5 C1 S begin
9 f0 p/ v8 B/ m7 B2 i P case(state)4 j/ R' X" ^6 @7 ^0 h! X& q6 m
Idle:
( H1 J+ {# l6 O6 m* M$ M- F. H begin
8 H/ Z$ S$ c7 ~* R* W* p if(A)
5 G @, d4 A4 Q' _ begin$ E3 |# u, X% J) E2 O$ Z
state<=Start;
, k, O9 w& ^" }/ R/ d: y5 i7 j K1<=0;
" u: m. j# Y% k+ P' a! a end
' D# M6 a# |+ c0 X else% ^" v9 C+ e% J% T( _1 I
begin$ }& g4 `2 l* |4 l) m" D. g) b
state<=Idle;
5 {. Y5 l& D! k& Y K2<=0;! M: K& x0 ^2 X
K1<=0;1 e1 e8 h9 G/ \2 k
end
" u( L$ Y5 @: O' \* y! q+ g end
" d6 \% H/ |& M& a- h Start:9 w9 t$ M9 W, e" U3 b& ?; r2 E9 B5 e
begin
2 U; q9 [+ R' w: Y; f- G if(!A)6 W9 j1 M! @8 I7 x( F* `' ~! I
begin
0 {, I5 ?3 w5 m! C' z state<=Stop;7 p6 G9 W W H, J: S9 n) z
end
- H/ C. R& P( M3 x/ D else: r2 C5 i! @9 F1 e
begin0 g& O7 F" {5 C! S
state<=Start;' Z* m" R% t0 L. ^2 |8 k
end
- e- R# e% r3 R: E end" y, R, P' \' N8 _* D% a
Stop:/ w9 D3 r& [' N' r9 q
begin
+ ?3 P( |8 o5 w _( a if(A)
- d5 w5 J4 Y6 R* h W3 ` begin+ {6 y3 F3 Z. W
state<=Clear;, w0 U g# L6 s( i7 Z- e
K2<=1;
) E: v6 t7 C7 n7 q* q; C" ?& ~ end6 A6 u# z! l, ] e: X
else
3 O* o, j$ T/ O begin1 N" K ?+ l9 j. `" y. ^0 Q! X
state<=Stop;
# P# `' x+ t+ X' Q4 M K2<=0;5 u$ j, L9 b9 D
K1<=0;
) V; J9 G* t3 q; W& F! ] end+ X# N. t- h) L
end
9 ^+ {: Z: @ \/ a5 M4 C Clear:
3 l I+ q2 N/ C4 Y, M+ v+ \ begin9 ^& S' g7 }2 h! q! D. Y3 v
if(!A)4 d% _7 P: P0 n; h
begin
! ^1 @& R N7 a! [ state<=Idle;2 X4 n6 a- C5 K9 I' O
K2<=0;
& o' C0 B3 S6 p0 p K1<=1; c4 G% b6 C3 d) m
end
% x9 f# K4 v7 i7 V else0 T2 O# w, k# ^3 Z
begin# i5 q$ N! T% x4 n1 o1 y8 @& f
state<=Clear;3 S0 p6 h2 H& w8 x5 J
K2<=0;9 O- w% R9 L- o _
K1<=0;
9 k' R9 o5 `- y, Q3 i# Q end0 P/ |: X+ a' I* u% u S
end
3 J- o! b. {5 X default:
9 x+ g( D, Z$ Q& t W begin
1 U" F$ b5 D/ I5 c+ V state<=Idle;
1 s7 G, X0 K3 G; h1 d6 l; R K2<=0;; c/ B. J U: t2 `- X" f
K1<=0;
4 F6 e1 W* B! u: W end0 e; o3 g' i+ c
endcase
4 m$ A1 x* a' u+ M4 T+ k0 { end3 q/ M7 }# {' R$ x$ i+ e0 Y
end
7 H( ]. s- h/ D+ b/ Kendmodule
) n6 v, z5 [) U# X: r# ?
" D1 H: u/ ?( F& ?) B4 x& H请问各位大神这是什么原因
! T" B0 j. D/ [$ `5 H5 M |
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/1 
发表于 2013-8-18 16:12
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