Fault Modeling of Graphene Nanoribbon FET Logic Circuits

[EN] Due to the increasing defect rates in highly scaled complementary metal-oxide-semiconductor (CMOS) devices, and the emergence of alternative nanotechnology devices, reliability challenges are of growing importance. Understanding and controlling the fault mechanisms associated with new materials and structures for both transistors and interconnection is a key issue in novel nanodevices. The graphene nanoribbon field-effect transistor (GNR FET) has revealed itself as a promising technology to design emerging research logic circuits, because of its outstanding potential speed and power properties. This work presents a study of fault causes, mechanisms, and models at the device level, as well as their impact on logic circuits based on GNR FETs. From a literature review of fault causes and mechanisms, fault propagation was analyzed, and fault models were derived for device and logic circuit levels. This study may be helpful for the prevention of faults in the design process of graphene nanodevices. In addition, it can help in the design and evaluation of defect- and fault-tolerant nanoarchitectures based on graphene circuits. Results are compared with other emerging devices, such as carbon nanotube (CNT) FET and nanowire (NW) FET.This work was supported in part by the Spanish Government under the research project TIN2016-81075-R and by Primeros Proyectos de Investigacion (PAID-06-18), Vicerrectorado de Investigacion, Innovacion y Transferencia de la Universitat Politecnica de Valencia (UPV), under the project 200190032.Gil Tomás, DA.; Gracia-Morán, J.; Saiz-Adalid, L.; Gil, P. (2019). Fault Modeling of Graphene Nanoribbon FET Logic Circuits. Electronics. 8(8):1-18. https://doi.org/10.3390/electronics8080851S11888International Technology Roadmap for Semiconductors (ITRS) 2013http://www.itrs2.net/2013-itrs.htmlSchuegraf, K., Abraham, M. C., Brand, A., Naik, M., & Thakur, R. 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Graphene: Electronic and Photonic Properties and Devices. Nano Letters, 10(11), 4285-4294. doi:10.1021/nl102824hBanadaki, Y. M., & Srivastava, A. (2015). Scaling Effects on Static Metrics and Switching Attributes of Graphene Nanoribbon FET for Emerging Technology. IEEE Transactions on Emerging Topics in Computing, 3(4), 458-469. doi:10.1109/tetc.2015.2445104Avouris, P., Chen, Z., & Perebeinos, V. (2007). Carbon-based electronics. Nature Nanotechnology, 2(10), 605-615. doi:10.1038/nnano.2007.300Banerjee, S. K., Register, L. F., Tutuc, E., Basu, D., Kim, S., Reddy, D., & MacDonald, A. H. (2010). Graphene for CMOS and Beyond CMOS Applications. Proceedings of the IEEE, 98(12), 2032-2046. doi:10.1109/jproc.2010.2064151Schwierz, F. (2013). Graphene Transistors: Status, Prospects, and Problems. Proceedings of the IEEE, 101(7), 1567-1584. doi:10.1109/jproc.2013.2257633Fregonese, S., Magallo, M., Maneux, C., Happy, H., & Zimmer, T. (2013). 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Аппаратная реализация преобразования SubBytes алгоритма шифрования Rijndael (AES)

Проведено аналіз існуючих рішень апаратної реалізації підстановлюючого блоку S-Box, що є основою перетворення SuBytes алгоритму шифрування Rijndael. Виконано синтез, моделювання та верифікацію динамічних і функціональних характеристик найбільш поширених варіантів на основі їхніх описів мовою VHDL.Analysis of existing solutions for substitution module S-Box hardware implementations which is the basic part of SubBytes transformation in Rijndael encryption algorithm is provided. Synthesis, modeing and dynamic and functional characteristics verification for the most popular options based on appropriate VHDL source codes are performed

Методы функционального диагностирования ошибок шифрования в симметричных криптографических системах

Проведено аналіз існуючих рішень з виявлення несправностей та помилок у симетричних криптографічних системах. Розглянуто аналітичну модель поширення помилок. Запропоновано узагальнену методику діагностування помилок шифрування, яка базується на спільних операціях, які використовуються у більшості криптографічних алгоритмів.Known issues analysis of symmetric cryptographic systems fault detection is carried out. Analytic model for error coverage is considered. Generalized procedure for enciphering fault detection based on commonly used operations from most cryptographic algorithms is proposed

Effects of intermittent faults on the reliability of a Reduced Instruction Set Computing (RISC) microprocessor

© 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.With the scaling of complementary metal-oxide-semiconductor (CMOS) technology to the submicron range, designers have to deal with a growing number and variety of fault types. In this way, intermittent faults are gaining importance in modern very large scale integration (VLSI) circuits. The presence of these faults is increasing due to the complexity of manufacturing processes (which produce residues and parameter variations), together with special aging mechanisms. This work presents a case study of the impact of intermittent faults on the behavior of a reduced instruction set computing (RISC) microprocessor. We have carried out an exhaustive reliability assessment by using very-high-speed-integrated-circuit hardware description language (VHDL)-based fault injection. In this way, we have been able to modify different intermittent fault parameters, to select various targets, and even, to compare the impact of intermittent faults with those induced by transient and permanent faults.This work was supported by the Spanish Government under the Research Project TIN2009-13825 and by the Universitat Politecnica de Valencia under the Project SP20120806. Associate Editor: L. Cui.Gracia-Morán, J.; Baraza Calvo, JC.; Gil Tomás, DA.; Saiz-Adalid, L.; Gil, P. (2014). Effects of intermittent faults on the reliability of a Reduced Instruction Set Computing (RISC) microprocessor. IEEE Transactions on Reliability. 63(1):144-153. https://doi.org/10.1109/TR.2014.2299711S14415363

Studying the effects of intermittent faults on a microcontroller

As CMOS technology scales to the nanometer range, designers have to deal with a growing number and variety of fault types. Particularly, intermittent faults are expected to be an important issue in modern VLSI circuits. The complexity of manufacturing processes, producing residues and parameter variations, together with special aging mechanisms, may increase the presence of such faults. This work presents a case study of the impact of intermittent faults on the behavior of a commercial microcontroller. In order to carry out an exhaustive reliability assessment, the methodology used lies in VHDL-based fault injection technique. In this way, a set of intermittent fault models at logic and register transfer abstraction levels have been generated and injected in the VHDL model of the system. From the simulation traces, the occurrences of failures and latent errors have been logged. The impact of intermittent faults has been also compared to that got when injecting transient and permanent faults. Finally, some injection experiments have been reproduced in a RISC microprocessor and compared with those of the microcontroller. © 2012 Elsevier Ltd. All rights reserved.This work has been funded by the Spanish Government under the Research Project TIN2009-13825.Gil Tomás, DA.; Gracia-Morán, J.; Baraza Calvo, JC.; Saiz-Adalid, L.; Gil Vicente, PJ. (2012). Studying the effects of intermittent faults on a microcontroller. Microelectronics Reliability. 52(11):2837-2846. https://doi.org/10.1016/j.microrel.2012.06.004S28372846521

Injecting Intermittent Faults for the Dependability Assessment of a Fault-Tolerant Microcomputer System

© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.As scaling is more and more aggressive, intermittent faults are increasing their importance in current deep submicron complementary metal-oxide-semiconductor (CMOS) technologies. This work shows the dependability assessment of a fault-tol- erant computer system against intermittent faults. The applied methodology lies in VHDL-based fault injection, which allows the assessment in early design phases, together with a high level of observability and controllability. The evaluated system is a duplex microcontroller system with cold stand-by sparing. A wide set of intermittent fault models have been injected, and from the simulation traces, coverages and latencies have been measured. Markov models for this system have been generated and some dependability functions, such as reliability and safety, have been calculated. From these results, some enhancements of detection and recovery mechanisms have been suggested. The methodology presented is general to any fault-tolerant computer system.This work was supported in part by the Universitat Politecnica de Valencia under the Research Project SP20120806, and in part by the Spanish Government under the Research Project TIN2012-38308-C02-01. Associate Editor: J. Shortle.Gil Tomás, DA.; Gracia Morán, J.; Baraza Calvo, JC.; Saiz Adalid, LJ.; Gil Vicente, PJ. (2016). Injecting Intermittent Faults for the Dependability Assessment of a Fault-Tolerant Microcomputer System. IEEE Transactions on Reliability. 65(2):648-661. https://doi.org/10.1109/TR.2015.2484058S64866165

Pairing Software-Managed Caching with Decay Techniques to Balance Reliability and Static Power in Next-Generation Caches

Since array structures represent well over half the area and transistors on-chip, maintaining their ability to scale is crucial for overall technology scaling. Shrinking transistor sizes are resulting in increased probabilities of single events causing single- and multi-bit upsets which require adoption of more complex and power hungry error detection and correction codes (ECC) in hardware. At the same time, SRAM leakage energy is increasing partly due to technology trends and partly due to the increasing number of transistors present. This paper proposes and evaluates methods of reducing the static power requirements of caches, while also maintaining high reliability. In particular, we propose methods of applying reduced ECC techniques to data that has been identified (by programmer or compiler) as error-tolerant. This segregation, in turn, makes both the default data and the error-tolerant data more amenable to decay-based techniques for leakage control. We examine the potential of this split memory hierarchy along several dimensions. In particular, we consider the power and reliability issues inherent in the approach. Overall, we show that our approach allows the ECC requirements of future applications and caches to be met while also reducing leakage energy

Characterizing the Effects of Intermittent Faults on a Processor for Dependability Enhancement Strategy

As semiconductor technology scales into the nanometer regime, intermittent faults have become an increasing threat. This paper focuses on the effects of intermittent faults on NET versus REG on one hand and the implications for dependability strategy on the other. First, the vulnerability characteristics of representative units in OpenSPARC T2 are revealed, and in particular, the highly sensitive modules are identified. Second, an arch-level dependability enhancement strategy is proposed, showing that events such as core/strand running status and core-memory interface events can be candidates of detectable symptoms. A simple watchdog can be deployed to detect application running status (IEXE event). Then SDC (silent data corruption) rate is evaluated demonstrating its potential. Third and last, the effects of traditional protection schemes in the target CMT to intermittent faults are quantitatively studied on behalf of the contribution of each trap type, demonstrating the necessity of taking this factor into account for the strategy

Proposal of an Adaptive Fault Tolerance Mechanism to Tolerate Intermittent Faults in RAM

[EN] Due to transistor shrinking, intermittent faults are a major concern in current digital systems. This work presents an adaptive fault tolerance mechanism based on error correction codes (ECC), able to modify its behavior when the error conditions change without increasing the redundancy. As a case example, we have designed a mechanism that can detect intermittent faults and swap from an initial generic ECC to a specific ECC capable of tolerating one intermittent fault. We have inserted the mechanism in the memory system of a 32-bit RISC processor and validated it by using VHDL simulation-based fault injection. We have used two (39, 32) codes: a single error correction-double error detection (SEC-DED) and a code developed by our research group, called EPB3932, capable of correcting single errors and double and triple adjacent errors that include a bit previously tagged as error-prone. The results of injecting transient, intermittent, and combinations of intermittent and transient faults show that the proposed mechanism works properly. As an example, the percentage of failures and latent errors is 0% when injecting a triple adjacent fault after an intermittent stuck-at fault. We have synthesized the adaptive fault tolerance mechanism proposed in two types of FPGAs: non-reconfigurable and partially reconfigurable. In both cases, the overhead introduced is affordable in terms of hardware, time and power consumption.This research was supported in part by the Spanish Government, project TIN2016-81,075-R, and by Primeros Proyectos de Investigacion (PAID-06-18), Vicerrectorado de Investigacion, Innovacion y Transferencia de la Universitat Politecnica de Valencia (UPV), project 20190032.Baraza Calvo, JC.; Gracia-Morán, J.; Saiz-Adalid, L.; Gil Tomás, DA.; Gil, P. (2020). Proposal of an Adaptive Fault Tolerance Mechanism to Tolerate Intermittent Faults in RAM. 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