Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1991-02-08
1993-11-23
Dixon, Joseph L.
Static information storage and retrieval
Magnetic bubbles
Guide structure
365222, 36523003, 364DIGI, 3642431, G06F 1202, G11C 700
Patent
active
052652319
ABSTRACT:
A memory controller and a method for controlling a memory including at least one memory bank including a plurality of storage locations. The memory controller receives memory access requests over a bus in a digital computer system and, in response initiates a memory access operation in connection with a storage location. The memory controller comprises a memory access control circuit that receives memory access requests over the bus and for performing a memory access operation in connection with a storage location in response thereto. A memory refresh control circuit includes a yellow refresh control circuit and a red refresh control circuit, both of which control refresh of the memory bank(s). The yellow refresh control circuit initiates a refresh operation in connection with a memory bank while the memory access control circuit is performing a memory access operation. In that connection, the yellow refresh control circuit initiates a refresh operation in connection with a memory bank other than the bank with respect to which the memory access control circuit is performing a memory access operation. The red refresh control circuit, on the other hand, initiates a refresh operation in connection with at least one memory bank and concurrently disables said memory access control circuit from performing a memory access operation.
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Dixon Joseph L.
Jordan Richard A.
Nguyen Hiep T.
Thinking Machines Corporation
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