Po-Tsang Huang, Shu‐Wei Chang, Wen-Yen Liu, W. Hwang
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引用次数: 19
Abstract
Novel low power schemes for energy-efficient ternary content-addressable memory (TCAM) are presented in this paper. The butterfly match-line scheme is based on the pseudo-footless clock-data pre-charged architecture. It connects each pipelined stage in a butterfly style which significantly decreases both search time and power consumption. For applications like IP-address forwarding in a network router, a new don't-care based power gating and don't-care based hierarchical (DCBH) search-line scheme are proposed. The search-line is divided into global search-line (GSL) and local search-line (LSL) which is controlled by don't-care state in DCBH search-line scheme. Therefore, the power consumption on search line is reduced without any search time overhead. Besides, the power saving of the standby power is achieved by power gating technique. The proposed 256 times 128 bit TCAM has been implemented with TSMC 0.13 um CMOS technology. It shows 0.55 ns of match evaluation time on search operation with 0.29 fJ/bit/search of energy efficiency.
本文提出了一种新的低功耗节能三元内容可寻址存储器(TCAM)方案。蝶形匹配线方案基于伪无脚时钟-数据预充电架构。它以蝴蝶的方式连接每个管道阶段,这大大减少了搜索时间和功耗。针对网络路由器中ip地址转发等应用,提出了一种新的基于不在意的功率门控和基于不在意的分层(DCBH)搜索线方案。在DCBH搜索线路方案中,搜索线路分为全局搜索线路(GSL)和局部搜索线路(LSL),局部搜索线路由不关心状态控制。因此,在没有任何搜索时间开销的情况下,降低了搜索线上的功耗。另外,通过功率门控技术实现了待机电源的节能。提出的256次128位TCAM已采用台积电0.13 um CMOS技术实现。结果表明,匹配评估时间为0.55 ns,搜索效率为0.29 fJ/bit/次。