Although the transaction types and transaction input values are randomly generated, you will see the same results each time you simulate, because the seeds for the random number generator are not changed between simulation runs. This is normally desirable, since you want your test bench to generate the same results each time you run it. If you want to change the sequence of randomly generated values, you must change the seed values in the test bench.

Just below the begin statement in the sequencer process is an automatic macro, $InitializeDiagramTaskCall, which initializes the transactors of this BFM and also sets the random seed for the BFM's random number generator (this generator is used to randomize the posted transactions and the input data for these randomized transactions). Since this code is automatically generated, you cannot directly edit the seed statement in the macro. However, if you make another call to the InitializeUniform function below the macro, your new seed values will overwrite the auto-generated seed values.