National Chiao-Tung University

Department of Electronics Engineering & Institute of Electronics

Energy-Efficient Content-Addressable Memory Design for IPv6 Adressing Lookup Application

Student : Shu-Wei Chang

Advisor : Dr. Wei Hwang


The new high speed, low-power and noise-tolerant ternary content-addressable memories (TCAMs) using butterfly match-line scheme and don't care based low power technique are realized in this thesis. Butterfly match-line scheme reduces search delay by high parallel search. Furthermore, for IPv6 addressing lookup application, butterfly match-line scheme reduces switching activity also. By use of XOR-based conditional keepers, power consumption and search delay further reduced. The potential charge-sharing problem in the AND match-line could be solved also. Don't-care based low power technique takes the advantage of application future of TCAM. Don't-care based power-gating eliminate unnecessary precharege. Don't-care based hierarchical search-line scheme decrease switching capacitance. A 256-word x 128-bit energy-efficient ternary CAM is also proposed and simulations and layout are implemented in TSMC 0.13µm CMOS technology. Simulation results show that 0.29fJ/bit/search energy performance and 0.65ns search time operate in maximum frequency 500MHz.