How should I manage specific ordering of transactions in the sequencer

UVM
2

In reply to heckey:

Yopu are doing things twice, see you code:

        repeat(1000) begin
            // Generate next transaction
            assert(tx.randomize());  
 
            // Next transaction requires a special mode, set it first before sending the transaction
            if ( tx.cmd == SPECIAL_MODE_CMD ) begin
                // Generate special mode change transaction
                start_item(tmp_tx);
                assert(tmp_tx.randomize() with { cmd == SET_SPECIAL_MODE; });
                finish_item(tmp_tx);
            end
 
            // Send special mode transaction
            start_item(tx);
            finish_item(tx);
        end

Do you really start with a completely unconstrained seq_item and then you want to genearte another one where the data member cmd = SET_SPECIAL_MODE:
Even when you want to do this you can remove the if construct.