Dynamic content addressable memory cell

Details Dynamic content addressable memory cell Dynamic content addressable memory cell

G - Physics

11

C

G11C 11/24 (2006.01) G11C 11/56 (2006.01) G11C 15/04 (2006.01)

Patent

CA 2266062

A dynamic content addressable memory (CAM) cell is disclosed which is suitable for constructing relatively high-speed and large-capacity CAM arrays, having binary and ternary storage capability. The cell comprises a pair of storage devices, comparing means and a pair of memory access devices. In a compare operation, the comparing means couples a match line to a discharge line during a mismatch between a pair of complementary search bits carried on a pair of search lines and a pair of complementary data bits stored in the memory. In a read or write operation, the pair of access devices are activated by a word line to couple the storage capacitors to a pair of bit lines. A '0' or a '1' data bit is stored when the two storage capacitors carry complementary charges. A 'don't care' state is stored when both capacitors are discharged.

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