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:
Jul. 20, 2010
Filed:
Oct. 28, 2005
Jeffrey Herbert Fischer, Cary, NC (US);
Michael Thaithanh Phan, Cary, NC (US);
Chiaming Chai, Chapel Hill, NC (US);
James Norris Dieffenderfer, Apex, NC (US);
Jeffrey Herbert Fischer, Cary, NC (US);
Michael ThaiThanh Phan, Cary, NC (US);
Chiaming Chai, Chapel Hill, NC (US);
James Norris Dieffenderfer, Apex, NC (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
The search key and key fields of a CAM in a cache are encoded with a Hamming distance of at least two to increase the speed of the CAM by ensuring each mismatching match line is discharged by at least two transistors in parallel. Where the cache is physically tagged, the search key is a physical address. The page address portion of the physical address is encoded prior to being stored in a TLB. The page offset bits are encoded in parallel with the TLB access, and concatenated with the encoded TLB entry. If a page address addresses a large memory page size, a plurality of corresponding sub-page addresses may be generated, each addressing a smaller page size. These sub-page addresses may be encoded and stored in a micro TLB. The encoded key and key field are tolerant of single-bit soft errors.