Enhanced reliability data storage system with second memory for

Details Enhanced reliability data storage system with second memory for Enhanced reliability data storage system with second memory for

1981-06-01

1985-06-25

Zache, Raulfe B.

Boots, shoes, and leggings

371 61, 371 66, 365228, G06F 1302

Patent

active

045258007

ABSTRACT:
A time delay memory system is used for enhancing the reliability of a data processing system or the like, wherein the critical information contents of temporary storage means are preserved from destruction by the adverse effects of an externally originated, transient condition. Critical information, which includes time-dependent critical data and a time reference, is periodically collected from a scratch pad memory and a timer respectively. The critical information is transferred to secondary storage means and remains there throughout a predetermined delay interval, substantially immune to the adverse effects of any transient condition. The delay interval exceeds the expected duration of the transient condition and its adverse effects. If the system is switched to a recovery mode by the occurrence of a transient condition, the critical data and the time reference are reloaded from the secondary storage means into the scratch pad memory and timer respectively at the end of the delay interval. The timer is synchronized and the reloaded time reference, after being updated for the known delay interval, is used to compensate the time-dependent, reloaded critical data in the scratch pad memory for its age and thus restore data integrity.

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patent: 4335447 (1982-06-01), Jerrim
patent: 4413327 (1983-11-01), Sabo et al.
patent: 4445189 (1984-04-01), Hyatt

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