Static information storage and retrieval – Read/write circuit – Data refresh
Patent
1988-11-09
1990-07-03
Fears, Terrell W.
Static information storage and retrieval
Read/write circuit
Data refresh
365233, 3652335, 36523001, G11C 1300
Patent
active
049396951
ABSTRACT:
A virtual type static semiconductor memory device according to the present invention comprises a refresh detector circuit for detecting the enabling operation of a refresh control circuit and a terminal for outputting to an outside a detection signal which is generated from the refresh detector circuit. The virtual type static semiconductor memory device informs a present refresh operation to the outside when it is accessed from the outside during the time period in which a refresh operation is conducted in the semiconductor memory device. A system employing the semiconductor memory device allows a slow access at that time only and allows access to be gained to the semiconductor memory device at high speed at other times.
REFERENCES:
patent: 4677592 (1987-06-01), Sakurai et al.
patent: 4747082 (1988-05-01), Minato et al.
patent: 4757217 (1988-07-01), Sawada
patent: 4764901 (1988-08-01), Sakurai
patent: 4807289 (1989-02-01), Nakajima
patent: 4811302 (1989-05-01), Koishi
Nogami et al., "1-Mbit Virtually Static RAM," IEEE Journal of Solid-State Circuits, vol. SC-21, No. 5, Oct. 1986.
Isobe Mitsuo
Nogami Kazutaka
Sakurai Takayasu
Sawada Kazuhiro
Ueno Hisashi
Fears Terrell W.
Kabushiki Kaisha Toshiba
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