Memory device including backup memory for saving data in...

Details Memory device including backup memory for saving data in... Memory device including backup memory for saving data in...

2005-12-06

2005-12-06

Nguyen, VanThu (Department: 2824)

Static information storage and retrieval

Powering

Data preservation

C365S228000

Reexamination Certificate

active

06973004

ABSTRACT:
A semiconductor device that quickly saves data stored in an area to which power is supplied intermittently. Power is supplied intermittently to a first area. Power is supplied continuously to a second area. A memory is located in the second area. A save circuit saves data used in the first area in the memory before the supply of power being stopped. A restoration circuit restores data which has been saved in the memory to a predetermined circuit in the first area. A power supply control circuit supplies power to the memory if data has been saved in the memory. Otherwise the power supply control circuit stops the supply of power to the memory.

REFERENCES:
patent: 5524248 (1996-06-01), Parks et al.
patent: 5978922 (1999-11-01), Arai et al.
patent: 2002/0091978 (2002-07-01), Higashida
patent: 2001-093275 (2001-04-01), None

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