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Title: ASIC-based design of NMR system health monitor for mission/safety–critical applications
Authors: Balasubramanian, Parvathavarthini
Keywords: N-modular Redundancy
Triple Modular Redundancy
DRNTU::Engineering::Computer science and engineering
Issue Date: 2016
Source: Balasubramanian, P. (2016). ASIC-based design of NMR system health monitor for mission/safety–critical applications. SpringerPlus, 5, 628-. doi:10.1186/s40064-016-2249-7
Series/Report no.: SpringerPlus
Abstract: 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.
ISSN: 2193-1801
DOI: 10.1186/s40064-016-2249-7
Rights: © 2016 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCSE Journal Articles

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