求助各位大佬，下面的代码哪里出现了错误，在vivado上仿真不通过

xiaozhubanna

ALU:
. r( A0 B' ^1 i" h# ^: w& z# e* {+ y4 Emodule ALU(CTRL,A,B,Q,Code);
input CTRL;
& ~1 g* R: I( d; e) W0 }input A;
& V+ B7 w: q  v0 t1 v# G! j5 E" iinput B;
; X# k& b& u7 u2 w; Uoutput Q;
  c4 A. {8 v1 b' G) Q; ~input[2:0] Code;
3 \- F! H' A  P5 X5 M/ lif (CTLR === 0)
   Q = 0;
: A" q* t6 R% f# belse
. \9 G+ w* C- r% z7 Z   case(Code)
     3'b000: Q = A+1;
5 t. u9 M) g( \     3'b001: Q = A+B+1;
     3'b010: Q = A;
) r4 M7 ?8 e: u- z5 H" _/ ^     3'b011: Q = A+B;
     3'b100: Q = A-1;
     3'b101: Q = A-B;
     3'b110: Q = B;
     default: Q = A-B-1;
   endcase
* _0 _6 z1 f; g+ w/ H1 Z2 yendmodule

& J+ k, q7 @& F% \
testbench:
0 D. U/ u0 l: W  |3 _0 |; H5 X/ ~module ALU_tb();
reg A,B,CTRL;
wire Q;
reg[2:0] Code;
! z0 o/ F* E4 Finteger case_num;
initial begin
+ h& }/ [$ h) g; @) P3 j3 |  CTRL=0;
, G  G0 E4 K9 ^6 V! b* ^/ _  case_num = 1;
  A=1 'b0;
3 L* F' v# N# I6 E( N3 d, \% k& e  B=1 'b1;
# t* ?$ v: P: F8 u, p  #100;
  if(Q==0)
: h$ N1 w1 ~$ b% h* d  $display("[Simulation Info] Case %2d PASS.",case_num);
) G4 i6 d* c' I+ H! p4 y/ }! }  else
: t7 j, V) T/ J' y$ B& V, Z   $display("[Simulation Info] Case %2d ERROR.",case_num);
   #100;
3 }- v9 j) a6 s& @% ]) l& n   CTRL=1;
   case_num = 2;
   A= 1 'b1;
  u# a+ S1 _/ Y( {, W4 @   B= 1 'b0;
   Code = 3 'b000;
   #20;
+ r" z  z4 y( J. }$ d) |2 r    if(Q==0)
: C# y0 j/ X9 Y, p% K! ^  $display("[Simulation Info] Case %2d PASS.",case_num);
& c4 a+ c/ X% o. s% l  r+ p+ J! h8 Z  else
1 o, v  M9 \4 i0 I' I   $display("[Simulation Info] Case %2d ERROR.",case_num);
, j0 g) k, Q3 K   #100;
0 Y( |/ m1 r" \/ [0 E7 P0 W% A   case_num = 3;
; G  v9 F  g( K( e3 L' j% W( j$ V9 w   Code = 3 'b001;
6 Y7 M9 y0 S' E2 j   #20;
7 e: a0 A+ Z$ n) k* A9 r+ n8 g    if(Q==0)
7 _+ l+ o. U7 t! o% o+ J# X3 @, X; u, r  $display("[Simulation Info] Case %2d PASS.",case_num);
  else
   $display("[Simulation Info] Case %2d ERROR.",case_num);
   #100;
    case_num = 4;
  X# ^9 m, C3 g" c2 v6 p2 `   Code = 3 'b010;
# Z+ r/ V$ R# U$ F' t" i) ]   #20;
4 J( Y! y; ?9 i    if(Q==1)
+ S( [+ k* t) j- P( a  $display("[Simulation Info] Case %2d PASS.",case_num);
  else
& h5 s1 N8 F; L" ^: i) d( F+ g   $display("[Simulation Info] Case %2d ERROR.",case_num);
   #100;
    case_num = 5;
   Code = 3 'b011;
   #20;
    if(Q==1)
  $display("[Simulation Info] Case %2d PASS.",case_num);
& G% p" t/ H! y" f  else
   $display("[Simulation Info] Case %2d ERROR.",case_num);
   #100;
) {5 C/ h  q& _    case_num = 6;
, r( D/ \& f2 x) m   Code = 3 'b100;
4 J* w. j% h+ D2 t   #20;
7 X( R& G% f$ @7 n    if(Q==0)
  $display("[Simulation Info] Case %2d PASS.",case_num);
4 n4 g& J) `0 {: D' q7 X+ R  else
- t3 ]# o. g" R" ^; H, ~   $display("[Simulation Info] Case %2d ERROR.",case_num);
   #100;
    case_num = 7;
8 ?6 {9 H) Q1 Q9 V   Code = 3 'b101;
   #20;
, Q. [& Q( W3 F    if(Q==1)
. C3 U* q, |: {9 U! s; U' r  $display("[Simulation Info] Case %2d PASS.",case_num);
  else
   $display("[Simulation Info] Case %2d ERROR.",case_num);
4 R' u, }0 g  q( N2 ~) B3 R   #100;
    case_num = 8;
   Code = 3 'b110;
   #20;
% i9 E% H1 s* T    if(Q==0)
: F- F- E+ E6 J+ g' g$ k# \  $display("[Simulation Info] Case %2d PASS.",case_num);
  else
2 B" \3 K3 Q" y! |. [   $display("[Simulation Info] Case %2d ERROR.",case_num);
' B) V" D, ]+ p$ W$ n   #100;
- O8 ^. `& z9 a  K" L" P& w2 M    case_num = 9;
   Code = 3 'b111;
   #20;
    if(Q==0)
+ T* ^+ ~8 m+ Q$ d$ A1 K$ O" `& Y  $display("[Simulation Info] Case %2d PASS.",case_num);
2 _: k3 Q3 a0 D$ r/ u" t  else
   $display("[Simulation Info] Case %2d ERROR.",case_num);
/ t% Y& _1 L/ G! ?1 R2 e$ W   #100;
   $finish;
end
endmodule