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Nonvolatile content addressable memory

  • US 5,930,161 A
  • Filed: 07/06/1998
  • Issued: 07/27/1999
  • Est. Priority Date: 12/06/1995
  • Status: Expired due to Fees
First Claim
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1. A multiple-valued NVCAM comprising:

  • a j row by k column memory cell array, the cells of each column being connected to m bit lines, each cell including m switching means and m ferroelectric capacitors, each of the ferroelectric capacitors in one cell having a different capacitance, j, k and m being integers, one switching means and the respective ferroelectric capacitor being connected in series between the respective bit line and a drive line, the switching means being asserted by a signal on a respective word line; and

    data sensing means for comparing the data stored in the cells to reference data,the data sensing means comprising;

    data acquisition means for acquiring the comparison results; and

    j data comparison means, each data comparison means being connected to the cells of the respective column and the data acquire means, each data comparison means comparing the data stored in the cells of the respective column to the reference data to provide comparison results to the data acquire means.

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