A Low-Power Ternary CAM With Positive-Feedback Match-Line Sense Amplifiers

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- mum CMOS technology. Energy measurement results of the two MLSAs show reductions of 56% and 48%, respectively, over the conventional current-race MLSA.

[1]  K. Pagiamtzis,et al.  A low-power content-addressable memory (CAM) using pipelined hierarchical search scheme , 2004, IEEE Journal of Solid-State Circuits.

[2]  Ali Sheikholeslami,et al.  A mismatch-dependent power allocation technique for match-line sensing in content-addressable memories , 2003 .

[3]  G. Kasai,et al.  200MHz/200MSPS 3.2W at 1.5V Vdd, 9.4Mbits ternary CAM with new charge injection match detect circuits and bank selection scheme , 2003, Proceedings of the IEEE 2003 Custom Integrated Circuits Conference, 2003..

[4]  José G. Delgado-Frias,et al.  Decoupled dynamic ternary content addressable memories , 2005, IEEE Transactions on Circuits and Systems I: Regular Papers.

[5]  Laxmi N. Bhuyan,et al.  EaseCAM: an energy and storage efficient TCAM-based router architecture for IP lookup , 2005, IEEE Transactions on Computers.

[6]  Ali Sheikholeslami,et al.  A ternary content-addressable memory (TCAM) based on 4T static storage and including a current-race sensing scheme , 2003, IEEE J. Solid State Circuits.

[7]  C. A. Zukowski,et al.  Use of selective precharge for low-power on the match lines of content-addressable memories , 1997, Proceedings. International Workshop on Memory Technology, Design and Testing (Cat. NO.97TB100159).

[8]  Manoj Sachdev,et al.  Match Line Sense Amplifiers with Positive Feedback for Low-Power Content Addressable Memories , 2006, IEEE Custom Integrated Circuits Conference 2006.

[9]  Rina Panigrahy,et al.  Reducing TCAM power consumption and increasing throughput , 2002, Proceedings 10th Symposium on High Performance Interconnects.