Storage device using dynamic RAM

Details Storage device using dynamic RAM Storage device using dynamic RAM

1995-08-14

1997-06-17

Fears, Terrell W.

Static information storage and retrieval

Powering

Data preservation

365222, 365226, G11C 1300

Patent

active

056403577

ABSTRACT:
A storage device which consumes small amounts of power during self-refreshing. The storage device includes a memory controller which forces a dynamic RAM to start a self-refreshing operation in response to a backup instruction signal. The backup instruction signal is issued when power from a main power source is shut off. During the self-refreshing operation, RAS and CAS signal lines connected to the dynamic RAM are grounded via pull-down resistors so that these signal lines are fixed to an L-level. When electric power is supplied via the main power line, a backup power supply controller directly transfers the electric power received via the main power line to a memory circuit, whereas the backup power supply controller transfers electric power received via the backup power line to the dynamic RAM when the power supply is switched to the backup power line. Upon initial installation of an additional memory module including a dynamic RAM, electric power is supplied first to the dynamic RAM via the backup power line, and electric power supply to the newly installed memory module is inhibited so that no power consumption occurs in the dynamic RAM of the newly installed memory module.

REFERENCES:
patent: 5473576 (1995-12-01), Matsui
MOS Integrated Circuit PD42S16400L, 4216400L, 42S17400L, 4217400L Data Sheet (NEC, issued Nov. 1993).

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