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1.源代码如下不能生成状态转移图- G \0 X8 T. J( E. [ M
module fsm(, w" l9 p9 r8 s
{7 j3 `; }6 ^) J; y& b6 U/ y0 A
clk,
. O/ B5 @8 r3 n/ t- J6 R2 i% N$ |# T, T' }
reset,$ A$ v: _* I, G( r' T
, l) v+ r" |8 \
A,+ o+ R3 _3 N3 G7 h/ ^9 P
" q, N' @9 j8 T9 |7 n8 _) fK1,
0 d: Y- O" [& O+ _7 X) A
! O; G8 i7 i: \) ]: hK2,/ T1 S; J: Q+ c" E$ Y4 T
& y) Z. H; F8 o$ w" _, h3 n/ ?) Xstate; h* m& V; ]+ d# G, U: t4 s
);5 L/ Z- w' S; K1 A) R
7 q) o2 }0 ?& ?7 D+ a
input clk,reset,A;
9 q G: ?& a( [5 c ?9 Z! N! houtput K1,K2;
% ~' G1 c$ _( h! y7 z//output[1:0] state;# E- N* M# S/ @ T' r
reg K1,K2;8 `, i; s3 N, K
reg [1:0] state;
8 \8 R6 Q. U8 |0 T2 t1 _/ q5 {* h; v; `+ C" ?
parameter Idle = 2'b00,2 X5 M B% [ R" [( I
: A5 L. D7 c. a0 }; ?
Start= 2'b01,
) B, n9 f3 h; B. Y# Y) i: `$ g% V# Y3 [3 N( p
Stop = 2'b10,3 Q, I `8 Y- r* }( v; ~
* u. i5 R& |3 R/ w' r! \) g Clear= 2'b11;
9 f( R, `+ T, ]7 b' A9 p
$ w$ c. Y6 n$ ~/ g2 H4 P1 X
1 E. c A9 R' Z# _ galways @(posedge clk)$ X% h2 E2 T# J4 v) f
begin. R: d, }: I% e, G! @: u
if(!reset)" z; N" C* E8 ]+ _
begin8 X# W9 ]+ Z& o- o& x
state<=Idle;7 E- B2 J) ^ D+ N3 L* x
K2<=0;+ J* x: R4 q- ]5 R
K1<=0;
# l( s" u+ @7 G! ] end
0 I' @$ s: B! C# B else- O+ E' B z; B, D6 ?/ y8 K; ]
begin
$ x% m: P, U- V) o& e case(state)
) z* ~: A, F% d; ^$ t Idle:; O6 @1 r/ E/ @; V: Z/ E3 l
begin
! _* _4 W" _; f" m' m if(A)4 ~" @5 y. u# L* N: a0 {
begin p, H* }7 f! T! H' l& L* P
state<=Start;' O& }5 p7 i- f- V$ f( k5 Z; f
K1<=0;6 q# S/ H' E9 X+ o% l' |1 ~
end
/ e8 v! z4 t3 `" ~1 U else7 Z: u- g: O; A, B
begin! N, o' h- A' a) b1 I* O' S0 z
state<=Idle;# X- O1 A7 n+ x: x/ Z/ L: j# b$ c) ~
K2<=0;
5 q4 n5 M& U" [+ z: R/ o K1<=0;
4 G9 T0 i& }) Y, U) `6 v2 O end" _& y( p/ p( C+ d6 Y" t% u1 _$ P
end
) g! C* ?- s+ t) i Start:0 k* e" d6 G! f2 R9 x* r' N3 Z
begin
2 R; y& N5 p& R7 l: g- |9 |& ]9 N if(!A)* C! v( D, A/ X% }- A/ u a1 y! G
begin
* E% _+ j6 p1 m' ~& L state<=Stop;
# D8 Z! N, _* O8 A" { end9 }% A# U) ^0 Q$ [% z( {
else
. L( A/ c8 D3 o6 T& K& g begin4 L/ J' p( g& x" W; V( b: X% n
state<=Start;' @4 @ t7 ~" ~) _7 H
end
/ _5 {, ]* n9 u4 p2 m8 I0 _- j end2 R) V0 ]; E! j7 F1 R
Stop:
7 b* |, z: ?" H. e/ `% u! {- e begin
% I* C& M) Y/ s1 o if(A)
, i% h) k( p5 z; { begin
$ d, ?: h: |0 A state<=Clear;4 M2 r0 g6 h* A+ o
K2<=1;+ c: V1 W( [0 x1 K
end9 u% |: f: E$ s: P& y* A
else
9 a d4 n7 f9 [$ _0 { begin
7 h0 M( E/ w9 `" | state<=Stop;
# A0 Y: S8 }/ b. }( v2 t9 N7 v K2<=0;
9 a! M0 J7 O; f. Y0 T8 F! R K1<=0;; @1 s0 S" Z, P# ]+ h+ D7 j
end
9 [5 n* Z+ x4 o) V$ D$ | end8 l" l7 M' b; J1 t) y& G
Clear:' `; h( ~4 p4 z, K4 _- b
begin
/ @" z t& r# G; c n* n if(!A)) j8 o, q+ H/ R$ D
begin
0 J; C4 G; ^' H7 r$ n state<=Idle;
6 X1 j# m* z- g- Z! S' d2 g K2<=0;
& K: {+ T0 H6 t0 W5 o K1<=1;! {# R& s$ t" p8 m% E" N: p
end
2 K: {5 c0 k% e/ `( i else
( M! P0 r3 w' r: Y begin
1 I8 ?' w5 n5 j6 {6 }5 h state<=Clear;
} }7 ?7 v0 |8 D( f% W7 F5 \ K2<=0;
4 }$ e8 d$ O' ]$ y" ^* X* C K1<=0; 2 ~, U* ~$ u- d0 B, I
end
9 a* N) `2 S! [+ y C end6 d! ?9 D" r5 S: Q/ T
default:
3 _. g8 g7 O9 M5 | Z; e3 T$ ] begin
: E5 S p* W% U! F; n* I: R% q state<=Idle;
* }; b$ y) M& F' h K2<=0;5 _- A/ N7 h/ J( ~. ?
K1<=0;' w0 D- Y$ H3 ~* v" k5 [
end
. g2 w0 o. R1 K4 x: U1 ^. I endcase / M# Q9 m1 q( T* }, ^
end# G- l3 }( P5 I9 y
end
3 D& [5 J8 `# v+ r# c3 iendmodule
8 z" M7 Y/ b/ @3 R, E* A1 `; T
- C$ V; c5 m( Y1 U5 W' @8 }4 W2.源代码如下能生成状态转移图
# R" Y2 Z |, L; A" rmodule fsm(4 J1 M: g) _2 z3 B
) ? C' h* k1 i. H2 }; i. V/ S; ?# w
clk,4 l# W- G0 E$ C' o
0 |# Q$ f! k% u( ~. m' Greset,8 B8 d, J5 x! E( ?( C$ I0 b4 r
% }! l; p* `0 E
A,* d) F$ | C* f: T) S
; B- M! W# N: H. G! r
K1,/ q1 y# E2 |9 _
3 |/ V: E. e& J
K2
# v( g1 [2 D; {* i( D# X );
# }6 {9 T, z5 s' c; R8 h3 Z) ^& T0 l9 o! z0 o
8 c( O5 `/ N O* I$ {( S6 q9 binput clk,reset,A;( w( L f" x5 y! E! Z9 c
output K1,K2;
" \+ p: m: T& h7 K
/ ?' m- t" c4 S5 Q9 Hreg K1,K2;8 H0 M. B- q& D& v7 b- u
reg [1:0] state;0 }3 _3 q! n7 m% A( K; A
5 n* l c! Q6 V
; O6 Y# n" e& V8 O* ?' a+ iparameter Idle = 2'b00,
) _2 R5 O2 S0 C- w4 G. i) [$ X( z0 _0 \5 g8 G4 q: k
Start= 2'b01,
& o6 e" z, B, Z: l$ s' \
) ?' \& G" D! {+ G; T' h Stop = 2'b10,
! N# ~' Z" \( N
2 o; I( y) N6 } K* C" O! j6 x9 J Clear= 2'b11;
1 r: \- J3 s/ [ W
% m: y$ o" U$ f/ T+ U$ K
2 G+ `- b$ r# w( a/ B2 W! [, y$ Palways @(posedge clk)
) |0 C5 Q2 w1 Q3 r$ Jbegin
6 N8 y [+ `0 |/ h! R5 W* Q3 N9 \ if(!reset)/ H& \+ U, O$ q+ Y) W) r& P
begin
5 H4 _* V9 g/ f5 d state<=Idle; F2 `& s4 E% {# @- [- f2 v; T
K2<=0;
3 [" a8 t" g& ?# K% y0 @ K1<=0; x2 U* i' g5 O8 T6 u% ^& R
end
# l! l/ K# E$ @' s# J$ a0 C else
! [2 z* e; p: W4 z" f begin' f& `* F: }! y
case(state)
1 f5 C% I+ Y# q' @& h, m Idle:2 v# n9 H' Y" k
begin
% k% M$ K6 s) m2 z! q if(A)( A/ ^& Y7 ^" k! ?# {" [8 C
begin
& |1 y8 V% w6 a, Y( k9 j) y state<=Start;
+ O5 I& }% V: w) U# { K1<=0;4 m% y2 G- v' T6 v' ]
end* i w: S% o" G- N* m
else
6 B" W6 c& P4 D, u) j! W7 K begin0 W# j- J, H8 q7 }8 g
state<=Idle;
`7 N& _! Q5 C* q# B K2<=0;
4 ^3 A* ?) o5 v. v; q K1<=0;, {. L( h! m. O" l3 W8 K
end
3 z$ u4 a9 v* U end2 N% b+ u8 F7 K; s0 j6 j
Start:
* D1 ~3 M. u! K: }8 E8 I/ w+ ]$ G% w begin
# ]) C: O8 g6 O: l2 Y if(!A)
1 @; l. ~$ P2 m; I3 E, W begin
3 V! t$ F+ I: R& e: } state<=Stop;0 ^1 p( I9 q8 L# K- P1 |3 j
end% C& ?; z8 D8 c4 ^7 c
else
- s! u( }' _) P$ D( O begin
0 }2 X8 s9 R7 H state<=Start;( V. G5 u2 q0 P% N
end1 {2 I& s; o7 B7 ^3 j8 l$ N+ O4 x
end! w/ ?7 J% {9 Z
Stop:
/ T8 c) Q2 r p& W begin% V9 x( }$ P5 k) S' R
if(A)
( z; k! }1 M: V2 r* T begin
; R8 z9 e- {) B. u7 H7 b+ C# s state<=Clear;# O8 X7 F" H3 J
K2<=1;
$ P' Z. s. Y; F! g end
' l W5 x) o& R1 ~ else+ L( l1 D* r( w3 j1 L1 C2 `2 |
begin
1 L5 r" D# ^5 r" V9 i# H: h; E state<=Stop;
# p8 p6 F6 y) u1 }8 W, R K2<=0;* i* |- ^; ^. P
K1<=0;
; v; K7 _3 k: n% s end
2 y# `; l4 K/ F, } end
/ q. m5 E0 l7 K v# B5 d) b/ x Clear:
6 K1 e$ z, P( h/ ]. Q, s begin
3 ^, N2 P( n% m1 G8 u. n if(!A)) F$ \$ U$ Q4 G( ~
begin
$ }0 v9 k4 r# Q0 d l state<=Idle;
! p. N1 |$ r: a- r8 R2 y K2<=0;1 C: f9 `: ~8 P! U! |
K1<=1;: J K1 H D- }0 p
end7 L$ ~6 F/ A v* [
else" [8 K! p! j; k5 j# e
begin: h3 y( s1 f; }, ~% }
state<=Clear;! }8 V* G. M* [) p
K2<=0;
& m7 M# X' e+ O. r K1<=0; r' W' I1 f/ L7 c& ~4 F+ q+ d
end! f' h7 n! A) t1 T" u0 T. M
end3 `8 b# ?+ a) n" c- n. _
default:" [( u0 |. v6 E' |: k
begin
7 d: K3 L0 z8 |& A state<=Idle;% _, {% v' l4 E/ L
K2<=0;
3 Q2 N+ H/ |/ p K1<=0;- O5 ^6 B6 [6 W% d" R; J: o
end
. e7 D3 [3 W7 N1 M1 ?/ s endcase
' f# M3 K: \+ c: l end
$ {: @+ b( W. d0 S0 k7 mend
( c; J$ Q! J9 \( J. vendmodule& K% k3 @% z, r: t
6 I) S# L. e) `, \5 U4 ^
请问各位大神这是什么原因! U, ~% ~! F) [* X0 i! m. Z
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/1 
发表于 2013-8-18 16:12
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