The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 09, 2001
Filed:
Dec. 04, 1998
Takashi Shinozaki, late of Saitama, JP;
NEC Corporation, Tokyo, JP;
Abstract
A prefetch controller includes a request address register containing an address associated with an access request, an address history table containing a history of accessed addresses, an adder generating a prefetch address, a plurality of subtracters each generating a difference between the address contained in the address history table and the address stored in the request address register, a selector selecting the output of one of the subtracters, and an address controller updating the address history table according to the address difference generated by the subtracter and issuing a prefetch request to cache memory. When a processor accesses data located at a regular interval, the prefetch controller predicts the address the processor is going to access and prefetches data at the address into the cache memory.