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Battery-backed Ram Integrity Check Disclosure Number: IPCOM000065574D
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2005-Feb-19

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Paulsen, RR [+details]


In repetitive process control applications a random access memory (RAM) is often used to store data. It is essential that the data not be changed inadvertently. Therefore, the RAM is provided with a battery supply as a back-up power source in the case of failure of the primary power source. However, if the battery backup system fails to operate properly, the data in the RAM could be altered. Use of the altered data could cause catastrophic failure. This can be avoided by verifying the data before it is used.