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:
Apr. 06, 2004
Filed:
Oct. 31, 2002
Yoichi Hariguchi, Menlo Park, CA (US);
Rina Panigrahy, Sunnyvale, CA (US);
Samar Sharma, Sunnyvale, CA (US);
Ashwath Nagaraj, Los Altos, CA (US);
Cisco Technology Inc., San Jose, CA (US);
Abstract
Methods and apparatus are disclosed for maintaining one or more ranges and identifying whether a value matches one of the ranges and optionally which range is matched. One implementation includes a range programming engine for generating one or more mapped subtrie values identifying each range, each of the mapped subtrie values identifying a different subset of the range. An associative memory stores the mapped subtrie ranges. A mapping engine receives a particular value and generates a lookup word including a mapped representation of the particular value. The associative memory performs a lookup operation to identify whether or not the particular value is within one of the ranges. In this manner, only a small number of associative memory entries are required to identify whether a mapped particular value falls within the range. The particular range matched can be identified such as by a read operation in an adjunct memory based on the address of the matching entry.