RE: [sv-ec] Confusion over covergroup instantiation inside class

Surya,

 

The footnote was deleted by

 

       http://www.eda.org/svdb/view.php?id=1239
<http://www.eda.org/svdb/view.php?id=1239> 

 

You may also be interested in

 

        http://www.eda.org/svdb/view.php?id=1279
<http://www.eda.org/svdb/view.php?id=1279> 

 

-- Brad

 

 

From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of
Bresticker, Shalom
Sent: Thursday, October 30, 2008 2:49 AM
To: Surya Pratik Saha; sv-ec@eda.org
Subject: RE: [sv-ec] Confusion over covergroup instantiation inside
class

 

Hi, 

 

The Draft 7a LRM says,

"A covergroup declaration within a class is an embedded covergroup
declaration. An embedded covergroup declaration declares an anonymous
covergroup type and an instance variable of the anonymous type. The
covergroup_identifier defines the name of the instance variable."

and

"An embedded covergroup variable may only be assigned in the new method.
An embedded coverage group can be explicitly instantiated in the new
method. If it is not, then the coverage group is not created and no data
will be sampled."

So the following would work:

 

module top;
class myclass;
  covergroup my_cg;
  endgroup : my_cg
function new();  my_cg = new; endfunction
endclass
endmodule

 

The footnote you quoted has been deleted.

 

I'm sure others can give you fuller explanations, as I don't understand
this too well yet.

 

Please don't cc: sv-bc on such issues.

 

Shalom

 

________________________________

	From: owner-sv-ec@server.eda.org
[mailto:owner-sv-ec@server.eda.org] On Behalf Of Surya Pratik Saha
	Sent: Thursday, October 30, 2008 11:28 AM
	To: sv-bc@server.eda.org; sv-ec@server.eda.org
	Subject: [sv-ec] Confusion over covergroup instantiation inside
class

	Hi,
	In the LRM section "18.3 Using covergroup in classes" it is
mentioned a covergroup can be instantiated explicitly. But the following
case:
	
	module top;
	class myclass;
	  covergroup my_cg;
	  endgroup : my_cg
	  my_cg x = new();
	endclass
	endmodule
	
	is failed by most of the standard simulators. Is there any
reason for that.
	Also in all the examples given in that section, the
instantiation of covergroup without declaring the identifier is used
only inside function new. But in the foot note 15, it is mentioned:
	
	"It shall be legal to omit the covergroup_variable_identifier
from a covergroup instantiation only if this implicit instantiation is
within a class that has no other instantiation of the covergroup."
	
	Does that signify, covergroup can be instantiated outside the
function new too? What about the case:
	module top;
	class myclass;
	  covergroup my_cg;  
	  endgroup : my_cg
	  my_cg  = new(); 
	endclass
	endmodule
	
	which except one, all the standard simulator fail.
	
	

	-- 
	Regards
	Surya

	
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