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Content addressable memory having bidirectional lines that support passing read/write data and search data

  • US 7,911,818 B2
  • Filed: 03/16/2009
  • Issued: 03/22/2011
  • Est. Priority Date: 03/16/2009
  • Status: Expired due to Fees
First Claim
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1. A content addressable memory (CAM) array having a column that comprises:

  • a first plurality of CAM cells;

    a first local bit line coupled to each of the first plurality of CAM cells, wherein data is read from and written to the first plurality of CAM cells on the first local bit line;

    a first search line coupled to each of the first plurality of CAM cells, wherein search data is applied to the first plurality of CAM cells on the first search line;

    a first sense amplifier coupled to the first local bit line;

    a first tri-state read buffer having an input coupled to the first sense amplifier and an output coupled to the first search line; and

    a column interface coupled to the first search line, wherein the column interface provides the search data on the first search line, and receives read data on the first search line.

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