Two store data storage apparatus having a prefetch system for th

Details Two store data storage apparatus having a prefetch system for th Two store data storage apparatus having a prefetch system for th

1985-05-17

1988-03-01

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 1200, G06F 926

Patent

active

047290927

ABSTRACT:
Data storage apparatus comprises a main store, for example a microprogram store, with an associated address generating circuit. In order to extend the capacity of the store, an additional store is provided, but because of physical limitations this is remote from the main store. To reduce delays in accessing data items from the additional store, a prediction circuit predicts the address of the next item to be required from the additional store and prefetches it. A control circuit checks whether the prefetched item is the correct one and, if it is not, causes a temporary hold-up in the operation of the address generation circuit to allow the correct data item to be fetched.

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patent: 4156905 (1979-05-01), Fassbender
patent: 4179731 (1979-12-01), Yamazaki
patent: 4179737 (1979-12-01), Kim
patent: 4292674 (1981-09-01), Scheuneman
patent: 4371924 (1983-02-01), Schaefer et al.
patent: 4373180 (1983-02-01), Linde
patent: 4390946 (1983-06-01), Lane
patent: 4439827 (1984-03-01), Wilkes

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