Power isolation for memory backup
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United States of America Patent
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Feb 2, 2016
Grant Date -
Jun 21, 2012
app pub date -
Apr 6, 2011
filing date -
Dec 20, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Disclosed is a power isolation and backup system. When a power fail condition is detected, temporary storage is flushed to an SDRAM. After the flush, interfaces are halted, and power is removed from most of the chip except the SDRAM subsystem. The SDRAM subsystem copies data from an SDRAM to a flash memory. On the way, the data may be encrypted, and/or a data integrity signature calculated. To restore data, the SDRAM subsystem copies data from the flash memory to the SDRAM. On the way, the data being restored may be decrypted, and/or a data integrity signature checked.
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