in general , in one aspect , the disclosure describes creation of a randomization list that includes only a subset of the logic states of an integrated circuit . the subset being selectable by signal so as to define logic states that can be randomized for specific events . the randomization list is during simulation to randomize the logic states defined therein to simulate a specific event occurring during operation of the ic . for example , the randomization list may include those signals that can be randomized upon exiting from a powered down state . the signals that can be randomized may be defined by excluding the signals that cannot be randomized . the contents of registers of the ic can be confirmed after the randomization and exit from the c6 mode .