RE: [sv-cc] Name of t/f vpiRefObj

Jim,
Thank you for clarification of this construction. My reading was similar but
now I have certainty that others read it likewise,
 
Radek
  _____  

From: Jim Vellenga [mailto:vellenga@cadence.com] 
Sent: Friday, October 11, 2013 5:13 PM
To: Radoslaw Nawrot; sv-cc@eda.org
Cc: Przemek Cichon
Subject: RE: [sv-cc] Name of t/f vpiRefObj



Radek, I don't know if you got an answer on this or not.  I am writing to
you from my own reading of the standard, so what I'm saying does not
represent the agreed-on understanding of the committee.

 

In "37.15 Reference objects", detail 2 says "A ref obj may be obtained .
when traversing an expression that is a use of such ref obj, or when
accessing the io decl of an instance or task or function."  It appears to me
that the argument "x" to the user-defined task $vpi() is a "use of such ref
obj," and therefore should be treated as a vpiRefObj just as the argument to
the function "tsk" is.

 

And from detail 3, "The name of ref obj can be different at every instance
level it is being declared. The vpiActual relationship always returns the
actual instantiated object if the ref obj is bound to an actual object at
the time of the query."  In the context, it looks like the vpiActual is
reserved for the object at the end of the vpiRefObj chain -- that is, the
"vpiVariable from the top layer," as you said.

 

Jim Vellenga

 

From: owner-sv-cc@eda.org [mailto:owner-sv-cc@eda.org] On Behalf Of Radoslaw
Nawrot
Sent: Wednesday, April 24, 2013 3:07 AM
To: sv-cc@eda.org
Cc: Przemek Cichon
Subject: [sv-cc] Name of t/f vpiRefObj

 

Hello,

I have problem with LRM interpretation.

SV example:

 

module top;

bit b;

 

task automatic tsk(ref x);

$vpi(x);

endtask

 

initial 

    tsk(b);

endmodule

 

From $vpi argument:

 

vpiType == vpiRefObj

vpiName == x

vpiDefName == b

 

And vpiActual relation gives be :

vpiBitVar with vpiName == b 

 

Am I right?

Or maybe if $vpi argument should be vpiName ==b , vpiType ==vpiBitVar?

 

And 2nd question:

 

 If I pass variables via few ref's vpiActual should return the near
vpiRefObj or vpiVariable from top layer ?

 

Regards,

Radek

 


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