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. 10, 2001
Filed:
Sep. 21, 2000
Lars-{haeck over (O)}rjan Kling, Södert{haeck over (a)}lje, SE;
Häkan O. Ahl, Stockholm, SE;
Kjell G. Torkelsson, Skarpn{overscore (a)}ck, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A content addressable memory (CAM) permits a matching operation to be performed over multiple stored entries. The CAM includes a matrix of cells having (n+1) columns and m rows, wherein n and m are each integers greater than or equal to 1, and wherein each row of cells comprises: n data storage cells; a carry storage cell; word compare logic; and carry write logic. For each word of CAM storage, the data storage cells store bits representing one of a number of fractional parts of the data to be stored. The carry storage cell stores a signal that represents whether a previous row generated a match in a preceding matching operation. By presenting fractional parts of a large comparand in sequence, a final compare operation generates an output that indicates whether the entire comparand (i.e., the fractional parts of the comparand considered together) matched a stored entry in the CAM.
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