有關verilog 錯誤

laasong

小弟我是新手  想把呼叫function函數改成呼叫task 但不知道是哪邊有問題會一值出現  希望高手們能幫我一下  
我猜應該是在always和呼叫連結不起來的問題  卻不知道如何下手
4 x$ D4 V& \' o$ r3 f, u4 ?6 encvlog: *W,FAAOP1 (shift.v,49|7): task or function call does not specify all formal output arguments [10.2.2][10.3(IEEE)].
output [7:0] mout;
* f8 z1 e: T1 ~7 \8 m) \+ C9 _                |
ncvlog: *W,FAAOP2 (shift.v,60|16): Formal output argument 'mout' is absent in the task or function call identified by the previous error message [10.2.2][10.3(IEEE)].
6 I9 l% ^) E8 Ymultdiv8(right,indata,mout);
       |
ncvlog: *W,FAAOP1 (shift.v,51|7): task or function call does not specify all formal output arguments [10.2.2][10.3(IEEE)].
output [7:0] mout;
; [" z  i  ]% D
1 S. G- Q6 D1 Y8 V% C7 f: }0 J
原本的code:

* M3 x: G& m( n2 w0 S+ `  i7 t+ Bmodule shift(indata,qout,mout);

output [7:0] qout;
, C# W! N- ^* l0 x* Woutput [7:0] mout;
input   [7:0]  indata;

reg [7:0] qout;
reg [7:0] mout;
parameter left=1;
parameter right=0;

, a8 ^/ E# c% r5 u# z, falways@(indata)

3 W3 e3 ^. m2 ?begin
1 d: k0 s) `! N2 B7 m2 }$ ]
8 Z1 Z2 l; z. K% V9 I- o9 amout=multdiv8 (left,indata);
qout=multdiv8  (right,indata);

: [  ]* n: q. B, F+ Eend

, o, B/ g" s  ^1 ~7 r. Z7 o( H# ~3 [function [7:0] multdiv8;
! f- z+ w% U" U: f3 E
input fcn_left :
input[7:0] fcn_in;
: S8 D# Q. `; D5 mbegin
2 A+ f" {( V7 o. p7 i( X    multdiv8=(fcn_left==1)?(fcn_in<<3): (fcn_in>>3);
end
endfunction
4 j8 J% k/ w$ M' r# f# \
endmodule

以下是我自己寫的
( P+ D' r, o% v+ `- P- ~: A5 j0 A
module (qout, mout,indata);
+ v  o+ E% x2 S) d$ a. R
output [7:0] qout;
: T8 e: R1 Z  J/ u9 x$ V% foutput [7:0] mout;
input [7:0] indata;
reg [7:0] qout;
) O1 w- c: _5 wreg [7:0] mout;
2 }5 y0 R, I9 p/ `2 }& Yparameter left=1;
, U) L. w: h% g7 S; Y5 T, c% f( Vparameter right=0;

9 s4 c- W( N2 Malways@(indata) begin
  _; q8 l( L: }& _# ]2 _. S4 @
multdiv8 (left,indata,qout);
multdiv8 (right,indata,mout);
1 Z; H, v0 H! h2 u, F# @
end

# v( b8 O# S. V3 \task multdiv8;

input fcn_left;
input [7:0] fcn_in;
/ x$ g) z+ u4 {  U7 F7 qoutput [7:0] qout;
output [7:0] mout;

1 x2 Y% M: C$ P, M) x
- u2 z8 W5 _% yif (fcn_left==1)
qout=fcn_in<<3;
0 K+ W" {% Q+ N. @' ^0 eelse
- A4 J6 t9 Y. W  G. smout=fcn_in>>3;
; u' T' ~$ k% U1 C! y* _
endtask
+ U/ q# R) _" I3 W' U# l4 r" n+ b$ Zendmodule

chienw

you did not specify qout when you called the task, which is the error message tries to tell you.

laasong

我知道我問題所在了  task的port和宣告的port不一致

2 t; d& M3 q2 ~7 W. H& a要在task後面多打qout and mout 這樣就OK了