virtual sequence not work, maybe it's a bug in uvm1.0p1

[aaron626]

Can anyone help me?

In virtual sequence, it works if the first parameter for ovm_create_on is sequence.

But if the first parameter is sequence_item, it can not work.

Maybe it is a bug.

(IUS92.36, UVM1.0p1)

  virtual task body();
    repeat(1) begin
      $display("Start Create");
      `uvm_create_on(seq, p_sequencer.seqr)
      $display("Start Randomize");
      assert (seq.randomize());
      $display("Start Send");
      `uvm_send(seq)
      $display("Trans Complete");

      $display("Start Create2");
      `uvm_create_on(trans, p_sequencer.seqr)
      $display("Start Randomize2");
      assert(trans.randomize() with 
      { trans.addr == 'h1000;
        trans.read_write == READ;
        trans.size == 1;
        trans.error_pos == 1000;
        trans.transmit_delay == 10; } )      

      $display("Start Send2");
[COLOR="Red"]      `uvm_send(trans)  // Never returned from this macro ERROR[/COLOR]
      $display("Trans Complete2");
      get_response(rsp);
    end

  endtask    

See the attached code, run testcase test_read_modify_write_2 with the following command:

make -f Makefile.ius

[uwes]

hi,

this could be a variant of mantis3414 http://eda.org/svdb/view.php?id=3414. can you try to rerun with a newer version of UVM?

/uwe

[hugemx830202]

do you mean UVM have released newer version of UVM1.0? I just checked with uvmworld website, it still uvm1.0p1, could you point us the weblink? Thanks

[aaron626]

what is the newer version?

I encountered this issue in uvm1.0p1.

[uwes]

hi,

there are no newer "released" versions of UVM. BUT the bugfix branch of UVM (UVM_10X_DEV) has quite some fixes for some of the problems found. I was suggesting to try the bugfix branch or if that is not an option you may try the patch:

http://uvm.git.sourceforge.net/git/gitweb.cgi?p=uvm/uvm;a=commitdiff;h=0aa7e3f11ebbac2d5ef50ad39eb55b0ee46bdf55

/uwe

[hugemx830202]

Does UVM_10X_DEV lib fix uvm_config_db wildcard setting bugs?

http://www.uvmworld.org/forums/showthread.php?173-uvm_config_db-NOT-work-as-expected-UVM1.0p1

[uwes]

yes, there is a fix for mantis3481

[Nesan]

Hi,

Now only am start learning UVM/OVM methodology, Am not sure on this , anyway i have some point to remember .

If you see the anatomy of the Sequence ,

m_sequencer is for seq_item .

p_sequencer is for sequence . I think if you change the code like below it will work.

`uvm_create_on(seq, m_sequencer.seqr).

.

Regards

Nesan

[uwes]

hi,

welcome to UVM - one thing to remember from the beginning is that fields and methods named m_* should be considered UVM private fields which should NOT be used in user code.

/uwe