Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1992-04-30
1995-05-23
Gossage, Glenn
Static information storage and retrieval
Magnetic bubbles
Guide structure
365222, 364DIG1, 395325, G06F 1314, G06F 1200, G11C 11406
Patent
active
054189209
ABSTRACT:
A refresh control system and method for refreshing DRAM memory in a data processing system, such as a communications system, are disclosed. A timer increments a refresh request counter each time that a desired refresh interval elapses. The contents of the refresh request counter is compared with the contents of a burst refresh counter, and a bus request signal generated responsive to the contents differing from one another, such difference indicating that a refresh operation should be performed. The bus arbitration scheme assigns no higher priority to the refresh priority request than for other bus operations; at such time as bus access is granted to the refresh operation, burst refresh is performed until the contents of the burst refresh counter again match the refresh request counter, at which time the bus is released. An emergency high priority bus request is generated when the difference between the contents of the refresh request counter and the burst counter exceed a given limit, indicating that violation of the refresh specification is imminent.
REFERENCES:
patent: 4249247 (1981-02-01), Patel
patent: 4965722 (1990-10-01), Tokume
patent: 5184325 (1993-02-01), Lipovski
patent: 5193165 (1993-03-01), Eikill et al.
patent: 5317709 (1994-05-01), Sugimoto
patent: 5347491 (1994-09-01), Kagami
Alcatel Network Systems, Inc.
Gossage Glenn
Nodig Sheela N.
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