Methods of operating memory devices include storing data of a first type in a first set of logical erase blocks and storing data of a second type in a second set of logical erase blocks. This enables designs that separate secure key management from the application-specific use of the keying material, and enables the rigorous evaluation of the key management module. The switch circuit determines the processor core that issued an access based on an address belonging to a second address space, and maps an address containing in an access from the processor core to an address of a first address space. A real-time frame is paused during a transition from the real-time mode to the time-shifted mode.