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. 05, 2013
Filed:
Feb. 02, 2012
Jagreet S. Atwal, Carrboro, NC (US);
Joseph S. Barnes, Chapel Hill, NC (US);
Kerry Bernstein, Underhill, VT (US);
Robert J. Bucki, Cary, NC (US);
Jason A. Cox, Raleigh, NC (US);
Jagreet S. Atwal, Carrboro, NC (US);
Joseph S. Barnes, Chapel Hill, NC (US);
Kerry Bernstein, Underhill, VT (US);
Robert J. Bucki, Cary, NC (US);
Jason A. Cox, Raleigh, NC (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A multi-wafer CAM cell in which the negative effects of increased travel distance have been substantially reduced is provided. The multi-wafer CAM cell is achieved in the present invention by utilizing three-dimensional integration in which multiple active circuit layers are vertically stack and vertically aligned interconnects are employed to connect a device from one of the stacked layers to another device in another stack layer. By vertically stacking multiple active circuit layers with vertically aligned interconnects, each compare port of the inventive CAM cell can be implemented on a separate layer above or below the primary data storage cell. This allows the multi-wafer CAM structure to be implemented within the same area footprint as a standard Random Access Memory (RAM) cell, minimizing data access and match compare delays.