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A mismatch-dependent power allocation technique for match-line sensing in content-addressable memories

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2 Author(s)
Arsovski, I. ; Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada ; Sheikholeslami, A.

In the conventional content-addressable memory (CAM), equal power is consumed to determine if a stored word is matched to a search word or mismatched, independent of the number of mismatched bits. This paper presents a match-line (ML) sensing scheme that allocates less power to match decisions involving a larger number of mismatched bits. Since the majority of CAM words are mismatched, this scheme results in a significant CAM power reduction. The proposed ML sensing scheme is implemented in a 256 × 144-bit ternary CAM for a 0.13-μm 1.2-V CMOS logic process. For a 2-ns search time on a 144-bit word, the proposed scheme saves 60% of the power consumed by the conventional sensing scheme.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 11 )