低开销时复用在线检测:H.264解码器的案例研究

Ming Gao, K. Cheng
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引用次数: 2

摘要

为了应对成本敏感型电子产品不断增加的现场故障率,[1]中提出并论证了一种低开销的在线检查方法——时间复用在线检查(TMOC)。在本文中,我们研究了在嵌入式现场可编程门阵列(eFPGA)内核中使用TMOC所需的面积开销。详细分析了eFPGA相对较低的逻辑密度和设计模块与其TMOC检查器之间的接口路由所造成的开销。在H.264解码器设计的案例研究[2]中,TMOC与基于重复的专用在线检查方案[3]进行了比较,后者通常会产生超过100%的面积开销。实验结果表明,TMOC可显著降低在线检查器的芯片面积开销。例如,当一个检查器由62个设计分区共享时,减少了68%。TMOC还可以通过增加分区数量来帮助减少在线检查的动态电源开销,但代价是增加某些分区的故障检测延迟。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low Overhead Time-Multiplexed Online Checking: A Case Study of An H.264 Decoder
To cope with increasing in-field failure rates for cost-sensitive electronic products, a low-overhead online checking methodology -- Time-Multiplexed Online Checking (TMOC) -- was proposed and demonstrated in [1]. In this paper, we study the area overhead required for employing TMOC in an embedded Field Programmable Gate Array (eFPGA) core. The overheads caused by the relatively low logic density of eFPGA and the interface routing between a design module and its TMOC checker are examined in detail. In a case study of an H.264 decoder design [2], TMOC is compared to a dedicated duplication-based online checking scheme [3], which typically incurs more than 100% area overhead. Experimental results show that TMOC provides significant chip area overhead reduction for online checkers. A reduction of 68% is achieved when one checker is shared by 62 design partitions, for example. TMOC can also help reduce dynamic power overhead of online checking by increasing the number of partitions, at the cost of increased fault detection latency in some partitions.
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