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. 21, 2009
Filed:
Jan. 18, 2005
Awais Bin Nemat, Santa Clara, CA (US);
Sachin Ramesh Gandhi, San Jose, CA (US);
Guy Townsend Hutchison, Santa Clara, CA (US);
Ben Xin Chen, San Jose, CA (US);
Awais Bin Nemat, Santa Clara, CA (US);
Sachin Ramesh Gandhi, San Jose, CA (US);
Guy Townsend Hutchison, Santa Clara, CA (US);
Ben Xin Chen, San Jose, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A quaternary content-addressable memory includes multiple entries configured to match a lookup word, with each of these entries including multiple cells and with the lookup word including multiple lookup bits for matching corresponding cells of each of the entries. Each of the cells is individually configurable to be in one of multiple states identified by two bits, with these states including a first matching state for matching a value of a corresponding bit of the lookup word with the value having a first matching value, a second matching state for matching the value of the corresponding bit having a second matching value, a wildcard state for matching the value of the corresponding bit having either the first or the second matching value, and an ignore state for indicating to ignore the cell in determining whether or not the entry to which the cell belongs matches the lookup word.