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ASIC-based design of NMR system health monitor for mission/safety–critical applications

机译:基于ASIC的NMR系统运行状况监控器设计用于任务/安全关键型应用

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摘要

N-modular redundancy (NMR) is a generic fault tolerance scheme that is widely used in safety–critical circuit/system designs to guarantee the correct operation with enhanced reliability. In passive NMR, at least a majority (N + 1)/2 out of N function modules is expected to operate correctly at any time, where N is odd. Apart from a conventional realization of the NMR system, it would be useful to provide a concurrent indication of the system’s health so that an appropriate remedial action may be initiated depending upon an application’s safety criticality. In this context, this article presents the novel design of a generic NMR system health monitor which features: (i) early fault warning logic, that is activated upon the production of a conflicting result by even one output of any arbitrary function module, and (ii) error signalling logic, which signals an error when the number of faulty function modules unfortunately attains a majority and the system outputs may no more be reliable. Two sample implementations of NMR systems viz. triple modular redundancy and quintuple modular redundancy with the proposed system health monitoring are presented in this work, with a 4-bit ALU used for the function modules. The simulations are performed using a 32/28 nm CMOS process technology.
机译:N模块化冗余(NMR)是一种通用的容错方案,广泛用于安全关键电路/系统设计中,以确保正确的操作并具有增强的可靠性。在被动NMR中,预计N个功能模块中至少有大多数(N + 1)/ 2可以随时正常运行,其中N为奇数。除了NMR系统的常规实现方式之外,同时提供该系统的运行状况指示也是有用的,以便可以根据应用程序的安全重要性来启动适当的补救措施。在这种情况下,本文介绍了一种通用NMR系统健康监测器的新颖设计,其特点是:(i)早期故障警告逻辑,该逻辑在产生冲突结果时通过任意任意功能模块的一个输出就被激活,并且( ii)错误信号逻辑,当不幸的是故障功能模块的数量达到大多数并且系统输出可能不再可靠时,该信号将发出错误信号。 NMR系统的两个示例实现。这项工作介绍了具有建议的系统运行状况监视功能的三重模块化冗余和五重模块化冗余,其中功能模块使用了4位ALU。使用32/28 nm CMOS工艺技术进行仿真。

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