Sharing non-sharable devices between an embedded controller...

Details Sharing non-sharable devices between an embedded controller... Sharing non-sharable devices between an embedded controller...

2011-04-19

2011-04-19

Patel, Nitin C (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S002000, C713S100000

Reexamination Certificate

active

07930576

ABSTRACT:
System and method for sharing a device, e.g., non-volatile memory, between a host processor and a microcontroller. In response to system state change to a first state wherein the microcontroller is assured safe access to the non-volatile memory (e.g., in response to power-on reset, system reset, sleep state, etc.), the microcontroller holds the system in the first state (e.g., system reset), and switches access to the non-volatile memory from the processor to the microcontroller. While the system is held in the first state, the microcontroller accesses the device (e.g., non-volatile memory), e.g., fetches program instructions/data from the non-volatile memory and loads the program instructions/data into a memory of the microcontroller. After the access, the microcontroller changes or allows change of the system state, e.g., switches access to the device, e.g., the non-volatile memory, from the microcontroller to the processor, and releases the system from the first state.

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