RE: [sv-ec] rand_mode called on a handle

18.8 says,

"If the random variable is an object handle, only the mode of the variable is changed, not the mode of random variables within that object (see global constraints in 18.5.8)."

Shalom

From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On Behalf Of Daniel Mlynek
Sent: Friday, December 17, 2010 10:29 AM
To: sv-ec@eda.org
Cc: grzegorz.kunc@aldec.com.pl
Subject: [sv-ec] rand_mode called on a handle

IMO there is ambiguity in LRM about rand mode called on a handle nested inside class.
See below code:

class C;
        rand int x;
endclass

class D;
        rand C c;

        task t;
                c.rand_mode(0); //this turn off rand for c.x but do not change rand mode of c itself???
        endtask
endclass

module top;
        D d;

initial begin
        d = new;
        d.c = new;
        d.c.rand_mode(0); //this should turn off rand for d.c.x???? and do not chanfe rand mode of d.c???
        $display(d.c.x.rand_mode());
end

endmodule

The question is if we will call rand_mode on handle should we change rand_mode of of this handle or should we go recursively inside the handle and change rand_mode of its objects.

DANiel

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