Static information storage and retrieval – Read/write circuit – Data refresh
Patent
1987-10-30
1991-01-08
Moffitt, James W.
Static information storage and retrieval
Read/write circuit
Data refresh
G11C 700
Patent
active
049842099
ABSTRACT:
An improved method for refreshing dynamic random access memory devices is disclosed. Normal refresh clocking signals are monitored and a count accumulated up to a selected value. Refresh operations are then initiated less frequently and only when the selected count has been accumulated. Once control of the bus to the memory has been achieved, a burst of refresh operations are performed prior to release of the bus. Improved efficiency and operating speed may be achieved by minimizing wasted time associated with acquisition and control of the bus. A preferred embodiment illustrates savings associated with a burst of four refresh operations each time the bus to the memory device is acquired for refreshing. Page addressing techniques are enhanced by forcing a change of state of the row address strobe line bus frequently than typical refresh operations.
REFERENCES:
patent: 3737879 (1973-06-01), Greene et al.
patent: 4084154 (1978-04-01), Panigrahi
patent: 4639858 (1987-01-01), Murray, Jr.
patent: 4691303 (1987-09-01), Churchward et al.
patent: 4802118 (1989-01-01), Honda et al.
Foster Mark J.
Rajaram Babu
Moffitt James W.
Zenith Data Systems Corporation
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