SRAM存储的容错设计和可靠性评估研究

Fault Tolerance Design and Reliability Evaluation of SRAM

针对传统纠错方法应用于SRAM数据纠错能力有限的问题,提出了一种基于汉明编码的镜像存储纠错方法。在汉明编码提供每个字节可纠正一位错误的基础上,利用两个SRAM存储间数据片段共享的特征,建立数据交换信道,实现了每个字节可纠正两位数据错误的能力提升,并完成了相应的容错逻辑设计。可靠性理论分析表明,该方法相对于未采用ECC和镜像存储方法的可靠性有一定程度的提高。

Aiming to solve the problem that traditional error correction method is limited when be applied to the SRAM data correction,this paper proposes a mirror image storage error correction method based on hamming code.On the basis of hamming code which can correct one-bit error per byte,this new method benefits from the factthat data segment is shared between these two storages,then it can correct two-bits errors per byte afterestablishthe data exchanging channel.Finally,this paper completes the corresponding fault-tolerant logic design.The reliability evaluationbased on the new method shows that the MTTF of the new design has a certain improvement comparing without using ECC or mirror storage methods.