{"title":"Dynamic LDPC codes for nanoscale memory with varying fault arrival rates","authors":"Shalini Ghosh, P. Lincoln","doi":"10.1109/DTIS.2011.5941439","DOIUrl":"https://doi.org/10.1109/DTIS.2011.5941439","url":null,"abstract":"Modern state-of-the-art nanodevices exhibit remarkable electronic properties, but the current assembly techniques yield very high defect and fault rates. Static errors can be addressed at fabrication time by testing and reconfiguration, but soft errors are problematic since their arrival rates are expected to vary over the lifetime of a part. Usual designs consider error correcting codes that tolerate the maximum failure rate expected over the entire lifetime. In this paper, we propose using a special variant of low-density parity codes (LDPCs) — Euclidean Geometry LDPC (EG-LDPC) codes — to enable dynamic changes in the level of fault tolerance. EG-LDPC codes have high error correcting ability (for large words they can approach the optimal Shannon limit) and they are sparse (circuit implementation requires small fan-in). In addition, a special property of EG-LDPC codes enables us to dynamically adjust the error correcting capacity for improved system performance (e.g., lower power consumption) during periods of expected low fault arrival rate. We present a system architecture for nanomemory based on nanoPLA building blocks using EG-LDPCs, where the encoder/decoder could also have faults, and analyze the fault detection and correction capabilities considering dynamic fault tolerance.","PeriodicalId":409387,"journal":{"name":"2011 6th International Conference on Design & Technology of Integrated Systems in Nanoscale Era (DTIS)","volume":"135 S234","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132905563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the diminished-1 modulo 2N+1 fused multiply-add units","authors":"C. Efstathiou, I. Voyiatzis","doi":"10.1109/DTIS.2011.5941427","DOIUrl":"https://doi.org/10.1109/DTIS.2011.5941427","url":null,"abstract":"In this work the most efficient modulo 2<sup>n</sup>+1 multiplication algorithm for diminished-1 operands proposed to date is extended to compute expressions of the form |A×B + D|<inf>2n+1</inf>. The derived partial products are reduced by a carry save adder tree to two operands, which are finally added by a modulo 2<sup>n</sup>+1 adder. The proposed architecture can find applicability in systems in which fused multiply-add units can accelerate the execution of the targeting algorithms, for example digital signal processing and cryptography systems.","PeriodicalId":409387,"journal":{"name":"2011 6th International Conference on Design & Technology of Integrated Systems in Nanoscale Era (DTIS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129961637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A CMOS linear-in-dB VGA based on exponential current generator","authors":"V. Kalenteridis, S. Vlassis, S. Siskos","doi":"10.1109/DTIS.2011.5941429","DOIUrl":"https://doi.org/10.1109/DTIS.2011.5941429","url":null,"abstract":"This paper proposes a simple CMOS exponential current circuit that is capable to control a Variable Gain Amplifier with a linear-in-dB manner. The proposed implementation is based on a Taylor's series approximation of the exponential function. A simple VGA architecture has been designed in a CMOS 90nm technology, in order to validate the theoretical analysis. The approximation achieves a 17dB linear range with less than 0.5dB approximation error, while the overall power consumption is less than 300μW.","PeriodicalId":409387,"journal":{"name":"2011 6th International Conference on Design & Technology of Integrated Systems in Nanoscale Era (DTIS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133661752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Bekiaris, A. Papanikolaou, G. Stamelos, D. Soudris, G. Economakos, K. Pekmestzi
{"title":"A standard-cell library suite for deep-deep sub-micron CMOS technologies","authors":"D. Bekiaris, A. Papanikolaou, G. Stamelos, D. Soudris, G. Economakos, K. Pekmestzi","doi":"10.1109/DTIS.2011.5941445","DOIUrl":"https://doi.org/10.1109/DTIS.2011.5941445","url":null,"abstract":"The continuous scaling of CMOS transistor and interconnect geometries brings to light novel challenges regarding the design of VLSI systems in the nanoscale era. On the other hand, most of the forthcoming deep-deep submicron technologies are not yet mature to be used for fabrication. Hence, the development of standard-cell libraries at the nanometer regime is emerging, in order to estimate the behavior of complex systems in short-term technology nodes. In this paper, we introduce a standard-cell library generator flow for sub-65nm nodes, based on scaling rules presented in the literature. Our goal is to create a set of complete standard cell libraries enabling the design of large digital systems in technologies not yet available for fabrication. The generated libraries are compatible with the state-of-the-art industrial tool flows and they have been evaluated by benchmarks of medium and large complexity.","PeriodicalId":409387,"journal":{"name":"2011 6th International Conference on Design & Technology of Integrated Systems in Nanoscale Era (DTIS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128783874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Wu, L. Dilillo, A. Bosio, P. Girard, S. Pravossoudovitch, A. Virazel, M. Tehranipoor, K. Miyase, X. Wen, N. Ahmed
{"title":"Power reduction through X-filling of transition fault test vectors for LOS testing","authors":"F. Wu, L. Dilillo, A. Bosio, P. Girard, S. Pravossoudovitch, A. Virazel, M. Tehranipoor, K. Miyase, X. Wen, N. Ahmed","doi":"10.1109/DTIS.2011.5941434","DOIUrl":"https://doi.org/10.1109/DTIS.2011.5941434","url":null,"abstract":"Launch-Off-Capture (LOC) and Launch-Off-Shift (LOS) are the two main test schemes for at-speed scan delay testing. In [1, 2], authors proposed a comparison between LOC and LOS, showing that LOS has higher performance than LOC in terms of fault coverage and test length, but higher peak power consumption during the launch-to-capture cycle. This shows the potential benefits of using LOS test scheme provided that power issues can be solved. In this context, this study investigates power reduction of LOS testing through X-filling techniques. Basically, the proposed solution consists in using test relaxation to identify don't-care bits (X-bits) in test vectors and then applying various X-filling techniques so that peak power during the launch-to-capture cycle is comparable to the power consumption in functional mode. In our experiments, we used ITC'99 benchmark circuits synthesized with an industrial 65nm technology. Experimental results show peak power reduction of up to 50% compared to the peak power when test vectors are generated with a conventional ATPG using the random filling option.","PeriodicalId":409387,"journal":{"name":"2011 6th International Conference on Design & Technology of Integrated Systems in Nanoscale Era (DTIS)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116878512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}