Microprocessor back-up system

Details Microprocessor back-up system Microprocessor back-up system

G - Physics

06

F

344/29

G06F 11/20 (2006.01) G11C 11/406 (2006.01) H04Q 11/04 (2006.01) G06F 11/00 (2006.01)

Patent

CA 1282151

ABSTRACT Microprocessor Back-up System A back-up system for the main processor of a digital telephone exchange comprises a storage array (120) of CMOS dynamic RAMS. Failure of the normal power supply triggers power changeover logic (20) so that the array (120) is refreshed in a manner to make best possible use of the failing power supply. Thereafter the system supplies regular refreshing to the array (120) but prevents changes in the data already stored.

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