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Preservation system for volatile memory with nonvolatile backup memory

  • US 5,519,663 A
  • Filed: 09/28/1994
  • Issued: 05/21/1996
  • Est. Priority Date: 09/28/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for providing memory power, comprising:

  • means for receiving external power;

    volatile memory means for storing data while at least a first level of power is provided;

    nonvolatile memory means for storing data;

    backup power storage means for storing said external power and for providing backup power to said volatile memory means at a level higher than said first level during an outage of said external power; and

    control means for transferring data from said volatile memory means to said non-volatile memory means in response to the detection of an outage of said external power, and for delaying said transfer until said backup power falls below said first level of power.

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