Low-power CAM

Details Low-power CAM Low-power CAM

2008-07-15

2008-07-15

Elms, Richard T. (Department: 2824)

Static information storage and retrieval

Associative memories

Flip-flop

C365S049170, C711S108000

Reexamination Certificate

active

11431439

ABSTRACT:
In one embodiment, a CAM is provided that includes; a plurality of memory cells grouped to store a word, wherein the memory cells are organized into a plurality of ripple groups, each ripple group including a complex logic gate configured to determine whether a stored content for the ripple group's memory cells matches a corresponding portion of a comparand word if an enable input for the ripple group is asserted, each complex logic gate asserting an output if the determination indicates a match, the ripple groups being arranged from a first ripple group to a last ripple group such that the output from the first ripple group's complex logic gate functions as the enable input for a second ripple group's complex logic gate and so on such that an output from a next-to-last ripple group's complex logic gate functions as the enable input for the last ripple group's complex logic gate.

REFERENCES:
patent: 6191970 (2001-02-01), Pereira
patent: 6243280 (2001-06-01), Wong et al.
patent: 6768659 (2004-07-01), Gillingham et al.
patent: 6903953 (2005-06-01), Khanna
patent: 6967856 (2005-11-01), Park et al.
patent: 7006368 (2006-02-01), Arsovski et al.
patent: 7113415 (2006-09-01), Khanna
K. Pagiamtzis and A. Sheikholeslami, “A Low-Powr Content-Addressable Memory (CAM) Using Pipelined Hierarchical Search Scheme,” IEEE Journal of Solid-State Circuits, vol. 39, No. 9 Sep. 2004, pp. 1512-1519.

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