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:
Jan. 09, 2001
Filed:
Feb. 16, 2000
Applicant:
Inventor:
David P Hannum, Fort Collins, CO (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 1/500 ;
U.S. Cl.
CPC ...
G11C 1/500 ;
Abstract
A three state, dual port CAM cell responsive to three combinations, i.e., 0,0 and 1,0 and 0,1, of two binary inputs includes a pair of latches, each having a pair of inverters connected in a regenerative feedback circuit. For the 0,0 combination, a driver and FET disable the second inverter in such a way that output tenninals of the latches supply 0,0 to a pair of data lines. For the 1,0 combination, both inverters of both latches are enabled, causing the latches to supply the data lines with 1,0. For the 0,1 combination, the second inverter is disabled in such a way that the output terminals of the latches supply the data lines with 0,1.