One of the basic functionality on the processor interface of a verification environment is to service interrupts along with register read / write operations. Servicing the interrupt requires stoping the ongoing register access sequence and executing the ISR sequence . This can be achieved using grab() method on the sequencer on an interrupt to stop the register read/write sequence and execute the interrupt sequence. ungrab() method should be used to return the sequencer control back to the register read/write sequence.
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