Prefetch circuit and associated method for operation with a virt

Details Prefetch circuit and associated method for operation with a virt Prefetch circuit and associated method for operation with a virt

1985-08-29

1988-01-26

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 1208

Patent

active

047220473

ABSTRACT:
A prefetch circuit for use with a memory including a storage register for receiving a command from the memory, a decoding circuit for decoding the command to determine the identification of an index register contained within the command, and a fetch circuit for fetching the contents of the index register from the command. The prefetch circuit also includes a virtual address storage register for receiving and storing the virtual address of the command, an adding circuit for adding a predetermined offset to the virtual address of the command to obtain a new virtual address, a comparison circuit for determining if the new virtual address from the adding circuit has crossed a virtual page boundary, a transfer circuit responsive to the comparison circuit for transferring the real address in the real address storage register to the adding circuit for adding the offset thereto, thereby obtaining a new real address. The fetch circuit then fetches a prefetched command from the memory at the new real address. Data registers are also included for prefetching data.

REFERENCES:
patent: 3618041 (1971-11-01), Horikoshi
patent: 3768080 (1973-10-01), Boger et al.
patent: 4218743 (1980-08-01), Hoffman et al.
patent: 4371924 (1983-02-01), Schaefer et al.
patent: 4422144 (1983-12-01), Johnson et al.
patent: 4502110 (1985-02-01), Saito

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