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Method for detecting intermittent error in volatile memory

  • US 4,698,808 A
  • Filed: 12/05/1985
  • Issued: 10/06/1987
  • Est. Priority Date: 12/14/1984
  • Status: Expired due to Fees
First Claim
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1. A method for checking data loss in a battery backed volatile memory to distinguish between geometrically uniform data loss resulting from power decay throughout said memory and geometrically random data loss resulting from another cause, comprising the steps of,processing data stored in two separate save areas in said volatile memory to determine whether the data in one said area is correct, and the data in the other said area incorrect or whether the data in both of said areas is incorrect,whereby an isolated malfunction, signified by said incorrect data in one but not both of said areas can be distinguished from a permanent error due to discharge of said battery, andrecovering from said data loss by copying said correct data into said area containing said incorrect data.

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