Rand_mode off methods

UVM
,
1

Hello,

I am using UVM from few months.
how to make rand mode of for sequence item without rand_mode inbuilt method.

i tried,

task body();
req.addr.rand_mode(0);
req.data.rand_mode(0);
`uvm_do(req)
endtask

it is showing run time error.
might be possible that req is created at time of uvm_do macro.
so tried uvm create and then rand_mode off and then uvm_rand_send. it is working fine.

So is there any other way to make this rand mode of for a sequence.

THanks in advance. :)

2

In reply to Dhanesh_Padia:

I guess you are getting NOA (null object error).
That’s because you haven’t created an object for the sequence.

Instead of using

`uvm_do

split that to below approach.

`uvm_create
<set rand modes>
<seq>.randomize()
`uvm_send

I think it is recommended to use .start instead of the macros.

In that case

<create sequence>
<set rand modes>
<seq>.start()
3

In reply to vvs3693:

We recommend never using the sequence macros so that the intent is always clear to the user and reader of the code:

task body();
  req = req_type::type_id::create(...);
  start_item(req);
  req.addr.rand_mode(0);
  req.data.rand_mode(0);
  if (!req.randomize()) `uvm_fatal("INVLD_CONSTRAINT","we have a problem")
  finish_item(req);
endtask
4

Thanks Dave and vvs. I will make a mark of this recommended thing.