Sequence library selection mode UVM_SEQ_LIB_USER

UVM
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1

Hi,

I am working on sequence library approach of UVM. In which, I found that there are four multiple ways for sequence execution.
[*] selection_mode: Sequence selection algorithm
UVM_SEQ_LIB_RAND: Selects the sequence randomly
UVM_SEQ_LIB_RANDC: Selects the sequence in random cyclic order
UVM_SEQ_LIB_ITEM: Generates sequence item only, sequence won’t be executed
UVM_SEQ_LIB_USER: Selects the sequence based on the algorithm defined by user inside function “select_sequence”

For the first three selection modes, It makes sense that how to use those approaches and how it work.

But I am not able figure out the way “How to use UVM_SEQ_LIB_USER mode ?”. I did not find any API/Method in uvm_sequence_library source code that we need to override or we need to implement our own algorithm and how will it be placed into execution?

Thanks in advance.

Regards,
Dhaval

2

In reply to Dhaval P:

You can set the selection mode at the beginnining of the run_phase like this:

task run_phase(uvm_phase phase);
  my_seq_lib lib = my_seq_lib::type_id::create("lib");
  lib.selection_mode = UVM_SEQ_LIB_RAND;

  // .......
endtask
3

In reply to chr_sue:

Dear chr_sue,

Thanks for the reply. But I am more interested in UVM_SEQ_LIB_USER mode.
How can we implement our own algorithm ?

But after overriding select_sequence method which is there in source code of uvm_sequence_library, I am able to control the flow of sequence.

Already got the solution for my question.

Once again thanks !!

Regards,
Dhaval