Six transistor content addressable memory cell

Details Six transistor content addressable memory cell Six transistor content addressable memory cell

1999-06-30

2000-08-08

Nguyen, Tan T.

Static information storage and retrieval

Associative memories

Ferroelectric cell

365154, 711108, G11C 1500

Patent

active

061011169

ABSTRACT:
A six transistor content addressable memory (CAM) cell that prevents disturb of non-written rows during a write operation. The CAM cell comprises an SRAM cell having a pair of cross-coupled inverters and a pair of access transistors. The SRAM cell stores a data value at the output node of one of the inverters and an inverse data value at the output node of the other one of the inverters. An access transistor is connected between each output node and a match line. The match line is connected across the access transistors such that the match line is coupled to the output nodes of the inverters when the access transistors are turned on. Data lines are connected to the gates of the access transistors, and are coupled to receive a data value and an inverse data value. The 6-T CAM cell of this embodiment can be coupled to a plurality of identical 6-T CAM cells to form an array. Each row of CAM cells is coupled to the same match line. Data values are written to and compared with data values stored within each CAM cell. A match condition is sensed on the match line. This 6-T CAM cell is therefore available for reliable use in a storage array. An additional benefit of the 6-T CAM cell is the small cell area due to the small number of transistors.

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