Patent ID: 7865646

Claim:
A system for allowing shared access by at least first and second processors to a module, the system comprising: a main power supply and an alternative power supply, wherein at least part of the module is configured to be powered by the alternative power supply; an internal bus connected to both (i) the at least part of the module configured to be powered by the alternative power supply and (ii) at least part of the module configured to be powered by the main power supply; a first processor interface associated with the first processor and configured to be powered by the main power supply and a second processor interface associated with the second processor and configured to be powered by the alternative power supply; and a transaction control module configured to determine that the main power supply is off and prevent the second processor from accessing the at least part of the module configured to be powered by the main power supply when the main power supply is off; wherein, even when the main power supply is off, at least one of the processors is capable configured to access, through the bus, the at least part of the module that is configured to be powered by the alternative power supply.