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. 11, 2003
Filed:
Oct. 25, 2002
Tomoo Tsuda, Chiba, JP;
Ryuichi Hata, Chiba, JP;
Kawasaki Microelectronics, Inc., Chiba, JP;
Abstract
A ternary content addressable memory device is disclosed which writes data into a data cell and writes mask data into a mask data cell in a ternary CAM cell unit by a single write cycle when the ternary content addressable memory device is used as a binary content addressable memory device. The content addressable memory device includes at least the ternary content addressable memory cell unit which stores ternary data representing three states of “0”, “1”, and “don't care”. The ternary content addressable memory cell unit include the data cell for storing binary data of “0” and “1”, and the mask cell for storing mask data for masking the binary data from a searching operation. The content addressable memory device includes a write circuit which writes the binary data into the data cell while writing the mask data in an unmask state into the mask cell at the same time, when the binary data is written into the ternary content addressable memory cell unit.