EMERGENCY FILE PROTECTION SYSTEM FOR ELECTRONIC DEVICES
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United States of America Patent
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Issued Date -
Mar 25, 2010
app pub date -
Sep 25, 2008
filing date -
Sep 25, 2008
priority date (Note) -
Abandoned
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Abstract
Disclosed is a method, system, and computer readable medium for completing critical write functions to a non-volatile memory (NVM) system within an electronic device upon experiencing a sudden or unexpected loss of the main power to the electronic device. A sudden loss of main external power is detected and determined if the loss of power crosses a minimum threshold level. If it does, an interrupt is generated to prevent new write requests. One embodiment uses a software interrupt and another embodiment uses a hardware interrupt. A switch over to a short term reserve internal power source occurs and the NVM write function in progress at the time of the power loss is completed. Upon completion of the NVM write operation, less critical shutdown activities can commence.
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