Constraint Randomization

SystemVerilog
,
1

Hello All,

I am having a constraint in my transaction.

class A 
  bit 3:0 a;

  constraint c_a { a<4 ; }

endclass

In my extended class, can I do constraint like (a> 4) without soft constraint?

Can I do something like, I make constraint off of the parent class and then write the constraint in extended class.?

Please let me know.
Thanks in Advance. :)

2

In reply to Dhanesh_Padia:

It is simpler than that. If you give the constraint the same name in the extended class, it overrides the constraint in the base class.

class B extends A; 
  constraint c_a { a>4 ; }
endclass

You can also do what you originally thought by turning off constraints in the base class and adding more

class B extends A; 
  function new;
     c_a.constraint_mode(0);
  endfunction
  constraint c_b { a>4 ; }
endclass
3

In reply to dave_59:

Thanks Dave.