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:
Nov. 25, 1997
Filed:
Nov. 14, 1994
International Business Machines Corporation, Armonk, NY (US);
Abstract
An access hazard detection technique in a pipelined cache controller sustains high throughput in a frequently accessed cache but without the cost normally associated with such access hazard detection. If a previous request (request in the pipeline stages other than the first stage) has already resulted in a cache hit, and it matches the new request in both the Congruence Class Index and the Set Index fields and if the new request is also a hit, the address collision logic will signal a positive detection. This scheme makes use of the fact that (1) the hit condition, (2) the identical Congruence Class Index, and (3) the Set Index of two requests are sufficient to determine that they are referencing the same cache content. Implementation of this scheme results in a significant hardware saving and a significant performance boost.