Fully static CAM cells with low write power and methods of match

Details Fully static CAM cells with low write power and methods of match Fully static CAM cells with low write power and methods of match

1994-07-27

1995-09-19

Popek, Joseph A.

Static information storage and retrieval

Associative memories

Ferroelectric cell

36518905, 36518907, G11C 1500

Patent

active

054522439

ABSTRACT:
A method and apparatus are disclosed for writing to a large content addressable memory (CAM) array without causing substantial power supply current surges, for providing fully static CMOS memory cells, for providing a consistent precharge of bit and bit bar lines, for providing a column write capability, and for increasing a read current while reducing a read disturbance probability. Each memory cell in the CAM array has (a) a data write circuit for accepting data, (b) a latch circuit for latching the data in the memory cell, (c) a hold circuit to allow holding the data or writing new data, (d) a data compare circuit for comparing the new data to the stored data, and (e) a data read circuit for reading the stored data. A memory cell further has control lines including (a) a read row enable (rren) line for enabling and disabling the data read circuit, (b) a match line for indicating a match between the stored data and the new data, (c) a write row enable (wren) line for enabling and disabling a row for a write operation, (d) a write column enable (wcen) line for enabling and disabling a column for a write operation, (e) a bit line, (f) a write column enable bar (wrenb) line for enabling and disabling the column for a write operation, and (g) a bit bar line. The present application also discloses methods for writing to CAM cells with a minimum power surge, for writing to a column of CAM cells, and for finding a match in the CAM array.

REFERENCES:
patent: 4894799 (1990-01-01), Hanawa et al.
patent: 5226005 (1993-07-01), Lee et al.
patent: 5339268 (1994-08-01), Machida
McAuley, Anthony J. and Cotton, Charles J., "A Self-Testing Reconfigurable CAM," IEEE Journal of Solid-State Circuits, vol. 26, No. 3, Mar. 1991, pp. 257-261.

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