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. 20, 2004
Filed:
Mar. 29, 2000
Takayuki Shimamura, Kawasaki, JP;
Shinya Kato, Kawasaki, JP;
Takato Noda, Kawasaki, JP;
Takumi Nonaka, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
To provide a cache-tag control method capable of correcting an error and capable of keeping a high-speed operation of a system at the same time. A true-tag with a parity code attached and a shadow-tag having an inverted polarity of the true-tag are stored respectively in separate addresses within a cache tag-RAM. At the time of retrieving the tags, both the true-tag and the shadow-tag are checked respectively to see whether there is an error in each tag. When an error has been detected, a hit decision is made by using a tag in which there is no error. Further, data within the cache tag-RAM is updated by using the tag in which there is no error, thereby correcting the error.