Patents Represented by Attorney Scully, Scott, Murphy & Presserm P.C.
  • Patent number: 8343814
    Abstract: A multi-ported CAM cell in which the negative effects of increased travel distance have been substantially reduced is provided. The multi-ported 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 multi-port CAM can be implemented on a separate layer above or below the primary data storage cell. This allows the multi-port 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. Each compare match line and data bit line has the length associated with a simple two-dimensional Static Random Access Memory (SRAM) cell array.
    Type: Grant
    Filed: August 17, 2009
    Date of Patent: January 1, 2013
    Assignee: International Business Machines Corporation
    Inventors: Robert J. Bucki, Jagreet S. Atwal, Joseph S. Barnes, Kerry Bernstein, Eric Robinson