A low-power ternary CAM with positive-feedback match-line sense amplifiers

Authors:
Nitin Mohan;Wilson Fung;Derek Wright;Manoj Sachdev
Affiliations:
Advanced Micro Devices, Inc., Boxborough, MA;Advanced Micro Devices, Inc., Markham, ON, Canada;Department of Electrical and Computer Engineering, Univ. of Toronto, Toronto, ON, Canada;Department of Electrical and Computer Engineering, Univ. of Waterloo, Waterloo, ON, Canada
Venue:
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Year:
2009

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Abstract

Ternary content-addressable memories (TCAMs) can perform high-speed and deterministic table lookups. However, its main drawback is high power consumption. A significant portion of the TCAM power is consumed by match-line sense amplifiers (MLSAs) for match detection. This paper presents a 20-kilobit TCAM featuring two MLSAs with positive-feedback techniques. The proposed circuits have been fabricated on a test chip in 0.18-µm CMOS technology. Energy measurement results of the two MLSAs show reductions of 56% and 48%, respectively, over the conventional current-race MLSA.