Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1989-05-23
1992-08-18
Bowler, Alyssa H.
Static information storage and retrieval
Magnetic bubbles
Guide structure
365 49, 36518901, G11C 700, G06F 1200, G06F 1300
Patent
active
051406810
ABSTRACT:
A main memory is subdivided into a shared region to undergo a write access from a plurality of processors and an input/output device and a plurality of private regions to undergo a write access only from the associated processor. Each of the cache devices includes a region discriminating circuit for determining whether an address generated from the processor is to be employed for an access to the shared region or to the private regions. If the access is to be conducted to the shared region, the cache devices operate according to the write-through method. On the other hand, if the access is to be conducted to the private region, the cache devices operate according to the copy-back method. When the processor or the input/output device rewrites data in the shared region of the main memory, the stored data of the shared region in the cache device of the processor is invalidated.
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"ACM Computing Surveys", vol. 14, No. 3, Sep. 1982, pp. 500-502.
IBM Technical Disclosure Bulletin, vol. 27, No. 12, May 1985, pp. 6845-6846, "Shared Instruction and/or Data Caches in a Multiprocessing System".
Aoki Hirokazu
Fukuta Hiroshi
Hatano Susumu
Kikuchi Takashi
Oishi Kanji
Bowler Alyssa H.
Hitachi , Ltd.
Hitachi VLSI Engineering Corp.
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