Nonvolatile content-addressable memory and operating method ther

Details Nonvolatile content-addressable memory and operating method ther Nonvolatile content-addressable memory and operating method ther

1989-02-14

1992-05-05

Hecker, Stuart N.

Static information storage and retrieval

Associative memories

Ferroelectric cell

365228, 365154, 365185, G11C 1500, G11C 1100

Patent

active

051114275

ABSTRACT:
Each of memory cells in a nonvolatile content-addressable memory (CAM) comprises a first memory transistor connected to a first storage node, a second memory transistor connected to a second storage node, and a memory capacitor connected between said first and second storage nodes. The first storage node is connected to a first bit line through an MOS transistor, and the second storage node is connected to a second bit line through the MOS transistor. In addition, each of the memory cells has a function of determining whether or not information applied to the first and second bit lines and information applied to the first and second storage nodes match with each other. In the nonvolatile CAM, writing and reading by a DRAM operation become possible by using the memory capacitor in each of the memory cells. In addition, in the nonvolatile CAM, nonvolatile writing and reading by an EEPROM operation become possible by using the first and second memory transistors in each of the memory cells. Furthermore, information stored in the memory capacitor or the first and second memory transistors in each of the memory cells can be searched by applying search information to the corresponding first and second bit line pairs.

REFERENCES:
patent: 3633182 (1972-01-01), Koo
patent: 4224686 (1984-09-01), Aneshansley
patent: 4333166 (1982-06-01), Edwards
patent: 4375086 (1983-02-01), van Velthoven
patent: 4375677 (1983-03-01), Schuermeyer
patent: 4532609 (1985-07-01), Iizuka
patent: 4803662 (1989-02-01), Tanaka
H. Kodata et al., "An 8Kb Content-Addressable and Reentrant Memory" 1985 IEEE International Solid-State Circuits Conference, Digest of Technical Paper (Feb. 13, 1985).
N. Becker et al., "A 5V-Only 4K Nonvolatile Static RAM", 1983 IEEE International Solid-State Circuits Conference, Digest of Technical Papers (Feb. 24, 1983).

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