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A new mismatch-dependent low power technique with shadow match-line voltage-detecting scheme for CAMs

Published: 04 October 2006 Publication History

Abstract

A new mismatch-dependent low-power technique is presented for content-addressable memories (CAMs). With a novel shadow match-line voltage-detecting scheme, the word circuits realize fast self-disable of the charging paths in case of mismatches. Since the majority of CAMs words are mismatched, a significant power is reduced with a high search speed. Simulation results show the proposed 256-word-144-bit ternary CAM, using 0.13-?m 1.2-V CMOS process, achieves 0.51 fJ/bit/search for the word circuit with less than 900 ps search time. The achievement illustrates a 77% energy-delay-product (EDP) reduction as compared to the speed-optimized current-saving scheme.

References

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F. Shafai, K. J. Schultz, G. F. R. Gibson, A. G. Bluschke, and D. E. Sompppi, Fully parallel 30-MHz 2.5-Mb CAM, IEEE J. Solid-State Circuits, vol. 33, pp. 666--676, Apr. 1998.
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P. Lin and J. Kuo, A 1-V 128-kb four-way set-associative CMOS cache memory using wordline-oriented tag compare (WLOTC) structure with the content-addressable-memory (CAM) 10-transistor tag cell, IEEE J. Solid-State Circuits, vol. 36, pp. 666--675, Apr. 2001.
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G. Kasai, Y. Takarabe, K. Furumi, and M. Yoneda, 2300MHz/200MSPS 3.2W at 1.5V Vdd, 9.4Mbits ternary CAM with new charge injection match detect circuits and bank selection scheme, in Proc. IEEE Custom Integrated Circuits Conference, 2003, pp. 387--390.
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I. Arsovski, T. Chandler, and A. Sheikholeslami, A ternary content-addressable memory (TCAM) based on 4T static storage and including a current-race sensing scheme, IEEE J. Solid-State Circuits, vol. 38, pp. 155--158, Jan. 2003.
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    cover image ACM Conferences
    ISLPED '06: Proceedings of the 2006 international symposium on Low power electronics and design
    October 2006
    446 pages
    ISBN:1595934626
    DOI:10.1145/1165573
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Published: 04 October 2006

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    Author Tags

    1. CAM
    2. high speed
    3. low power
    4. mismatch-dependent
    5. voltage detecting

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    ISLPED06: International Symposium on Low Power Electronics and Design
    October 4 - 6, 2006
    Bavaria, Tegernsee, Germany

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