Transactions from ref_model not arriving at scoreboard

UVM
1

I have the following problem:

My reference model ref_model.svh class, extends uvm_component. For each 1x incoming stimulus received at the ref_model I have to generate 10x output stimulus and send them to the scoreboard.

My problem :
The transactions @ref_model are printed correctly, that means i get all tran Nr.0 down to tran Nr.9 logged. But at the @scoreboard, I get the 10x transactions but the transaction is allways the last transaction, i.e. tran Nr.9.

Can anyone try to help me out to find my problem? :slight_smile:

Thank you for the help you can provide.

2

Without seeing any code, it can be difficult to provide a definitive solution.

Do you clone() your transactions when you send them to the scoreboard? If you re-use transaction handles, then you will be queuing the single handle, resulting in all transactions being the same.

Refer to the UVM Cookbook section on UVM Monitors for more information.

3

In case it helps future visitors of this post:

The solution I found is to create a new transaction @ref_model every time before it is sent .

transaction_type my_transaction = new();
// code to fill the transaction
my_port.write(my_transaction);

others can try the solution @cgales proposes, but that does not work for me:

my_port.write(my_transaction.clone());
4

If calling clone() doesn’t work for you, you should make sure that you implement all of the required transaction methods.

1 Like