Backup memory for reliable operation

Details Backup memory for reliable operation Backup memory for reliable operation

1996-08-29

1998-10-27

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711118, 711154, 711159, 711161, 711163, 711173, G06F 1300

Patent

active

058290478

ABSTRACT:
In order to provide reliable backup memory for the operational memory (RAM) of a control unit, two segments of a memory with write protect facility are used. Only one of these segments contains the backup memory at any one time, but the other segment may be updated with a new release. Write protect is removed from one of these segments only when an update is taking place. The software for controlling initialization of the operational memory from the backup memory is stored in the backup memory. Extensive checks are performed before accepting an update of the backup memory or an initialization of the operational memory.

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