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检索条件"机构=Key Laboratory of Computer System and Architeture Institute of Computing Technology"

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M-IVC: Using Multiple Input Vectors to Minimize Aging-Induced Delay

M-IVC: Using Multiple Input Vectors to Minimize Aging-Induce...

引用

Asian Test Symposium (ATS)

作者： Song Jin Yinhe Han Lei Zhang Huawei Li Xiaowei Li Guihai Yan Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architeture Institute of Computing Technology Chinese Academy and Sciences Beijing China

Negative bias temperature instability (NBTI) has been a significant reliability concern in current digital circuit design due to its effect of increasing the path delay with time and in turn degrading the circuit performance. NBTI degradation has strong dependence on input pattern and duty cycles. Based on this observation, we propose to apply multiple input vectors to the combination circuit in a non-uniform way during standby mode. Multiple input vectors can enhance the capability to control the circuit nodes, achieve smaller duty cycles to reduce the stress time of gates and thus mitigate static NBTI. A constrained multi-object optimization model is formalized to find the optimal combination of duty cycles for timing-critical paths, which in turn minimizes the increase of path delay. An ATPG-like procedure is then presented to generate the corresponding input vectors. Experimental results demonstrate that the delay increase of timing-critical paths can be mitigated significantly under long time NBTI effect (10-year) by only applying a small number of vectors.

关键词： Niobium compounds Titanium compounds Degradation Stress Delay effects Circuits Threshold voltage Clocks Resists Aging

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A unified online fault detection scheme via checking of stability violation 09

A unified online fault detection scheme via checking of stab...

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2009 Design, Automation and Test in Europe Conference and Exhibition, DATE '09

作者： Guihai, Yan Yinhe, Han Xiaowei, Li Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Graduate University Chinese Academy of Sciences Beijing 100039 China

ISBN: (纸本)9783981080155

In ultra-deep submicro technology, two of the paramount reliability concerns are soft errors and device aging. Although intensive studies have been done to face the two challenges, most take them separately so far, thereby failing to reach better performance-cost tradeoffs. To support a more efficient design tradeoff, we present a new fault model, Stability Violation, derived from analysis of signal behavior. Furthermore, we propose a unified fault detection scheme - Stability Violation based Fault Detection (SVFD), by which the soft errors (both Single Event Upset and Single Event Transient), aging delay, and delay faults can be uniformly handled. SVFD can greatly facilitate soft error-resistant and aging-aware designs. SVFD is validated by conducting a set of intensive Hspice simulations targeting 65nm CMOS technology. Experimental results show that SVFD has more robust capability for fault detection than previous schemes at comparable overhead in terms of area, power, and performance. © 2009 EDAA.

关键词： Fault detection

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Extended selective encoding of scan slices for reducing test data and test power

Extended selective encoding of scan slices for reducing test...

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18th Asian Test Symposium, ATS 2009

作者： Liu, Jun Han, Yinhe Li, Xiaowei Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China School of Computer and Information Hefei University of Technology Hefei China Academy of Sciences Graduate University of Chinese Beijing China

ISBN: (纸本)9780769538648

Recently, selective encoding of scan slices is proposed to compress test data. This encoding technique, unlike many other compression techniques encoding all the bits, only encodes the target-symbol by specifying single bit index and copying group data. In this paper, we propose an extended selective encoding which presents two new techniques: flexible grouping strategy, X bits exploitation and filling strategy. Flexible grouping strategy is able to decrease the number of encoded groups to improve compression ratio. X bits exploitation and filling strategy can exploit a large number of don't care bits to reduce testing power with no compression ratio loss. Experimental results show that the proposed technique needs less test data storage volume and reduces average weighted switching activity by 24.7%, peak weighted switching activity by 11.6% during scan shift compared to selective encoding. © 2009 IEEE.

关键词： Filling

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An efficient methodology for power modeling and simulation of modern cell-based microprocessors

An efficient methodology for power modeling and simulation o...

引用

Midwest Symposium on Circuits and systems (MWSCAS)

作者： Ge Zhang Weiwu Hu Institute of Computing Technology Key Laboratory of Computer System and Architecture Beijing China

This paper presents a methodology for high-level power modeling of cell-based processors. A flexible power model library, which can automatically generate detailed power data for actual circuits of each part of given processor, is developed and annotated dynamically for architecture-level power simulator. According to this method, the dynamic power, leakage power and even area and cell counts can be accurately estimated, and the preliminary power validation for a MIPS microprocessor proves our methodology to be effective and highly correlated, with only small errors comparing with the gate-level power analysis.

关键词： Microprocessors Circuit simulation Libraries Adders Circuit synthesis Power system modeling Analytical models Content addressable storage Power generation Flexible printed circuits

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HPPNetSim: A parallel simulation of large-scale interconnection networks

HPPNetSim: A parallel simulation of large-scale interconnect...

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42nd Annual Simulation Symposium 2009, ANSS 2009, Part of the 2009 Spring Simulation Multiconference

作者： Cao, Zheng Xu, Jianwei Chen, Mingyu Zheng, Gui Lv, Huiwei Sun, Ninghui Institute of Computing Technology Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781617386404

As the scale of parallel machine grows, communication network is playing more important role than ever before. Communication affects not only execution time, but also scalability of parallel applications. Parallel interconnection network simulator is a suitable tool to study large-scale interconnection networks. However, simulating packet level communication on detailed cycle-to-cycle network models is a really challenge work. We implement a kernel-based parallel simulator HPPNetSim to solve problems. Optimistic PDES mechanism needs huge memory consumption of saving simulation entities' states in large-scale simulations, so we chose conservative synchronization approach. Simulation kernel and network models are all carefully designed. To accelerate process of simulation, optimizations are introduced, such as block/unblock synchronization, load balancing, dynamic look-ahead generation, and etc. Simulation examples and performance results show that both high accuracy and good performance are obtained in HPPNetSim. It achieves speedup of 19.8 for 32 processing nodes when simulating 36-port 3-tree fat-tree network.

关键词： Discrete event simulation

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A case study of improving at-speed testing coverage of a gigahertz microprocessor

A case study of improving at-speed testing coverage of a gig...

引用

2009 16th IEEE International Conference on Electronics, Circuits and systems, ICECS 2009

作者： Qi, Zichu Liu, Hui Li, Xiangku Xu, Jun Hu, Weiwu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences PO Box 2704-25 Beijing 100190 China Beijing China Loongson Technologies Corporation Limited China

ISBN: (纸本)9781424450916

For a gigahertz microprocessor with multiple clock domains and a large amount of embedded RAMs (Random Access Memory), generating at-speed testing patterns is becoming very difficult and very time-consuming. This paper presents some novel techniques to improve at-speed testing coverage with low cost. These methods are major concern about preventing X states propagation, which include avoiding capturing X states for registers, sequential bypass of macros, clock control scheme for inter-clock domains and accurate analysis of exception paths in intra-clock domains. Functional patterns are utilized to further improv. The efficiency oy the at-speed testing. A novel optimal flow is presented by carefully selecting these techniques. By usin. The flow, 90% transition fault coverage is achieved. In addition, bot. The number of patterns an. The test time oy the transition test are decreased by 15%. The total area overhead is about a few hundreds of AND cells and has little timing impact oy the critical paths. © 2009 IEEE.

关键词： Random access storage

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HPPNetSim: A parallel simulation of large-scale interconnection networks

HPPNetSim: A parallel simulation of large-scale interconnect...

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2009 Spring Simulation Multiconference, SpringSim 2009

作者： Cao, Zheng Xu, Jianwei Chen, Mingyu Gui, Zheng Lv, Huiwei Sun, Ninghui Institute of Computing Technology Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

As the scale of parallel machine grows, communication network is playing more important role than ever before. Communication affects not only execution time, but also scalability of parallel applications. Parallel interconnection network simulator is a suitable tool to study large-scale in-terconnection networks. However, simulating packet level communication on detailed cycle-to-cycle network models is a really challenge work. We implement a kernel-based parallel simulator HPPNetSim to solve problems. Optimistic PDES mechanism needs huge memory consumption of sav-ing simulation entities' states in large-scale simulations, so we chose conservative synchronization approach. Simula-tion kernel and network models are all carefully designed. To accelerate process of simulation, optimizations are in-troduced, such as block/unblock synchronization, load balancing, dynamic look-ahead generation, and etc. Simula-tion examples and performance results show that both high accuracy and good performance are obtained in HPPNetSim. It achieves speedup of 19.8 for 32 processing nodes when simulating 36-port 3-tree fat-tree network.

关键词： Discrete event simulation

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A New Post-Silicon Debug Approach Based on Suspect Window

A New Post-Silicon Debug Approach Based on Suspect Window

引用

IEEE VLSI Test Symposium (VTS)

作者： Jianliang Gao Yinhe Han Xiaowei Li Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences

ISBN: (纸本)9781424437696

Bugs are tending to be unavoidable in the design of complex integrated circuits. It is imperative to identify the bugs as soon as possible by post-silicon debug. The main challenge for post-silicon debug is the observability of the internal signals. This paper exploits the fact that it is not necessary to observe the error free states. Then we introduce "suspect window" and present a method for determining its boundary. Based on suspect window, we propose a debug approach to achieve high observability by reusing scan chain. Since scan dumps take place only in suspect window, debug time is greatly reduced. Experimental results demonstrate the effectiveness of the proposed approach.

关键词： Post-silicon debug Suspect window Trace Scan Bug

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Optimizing inter-domain communication

Optimizing inter-domain communication

引用

15th International Conference on Parallel and Distributed systems, ICPADS '09

作者： Zang, Hongyong Sun, Yuzhong Gu, Kuiyan Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Dongxin Geology Research Institute of Shengli Oilfield Sinopec Dongying Shandong 257094 China

ISBN: (纸本)9780769539003

Virtual machine technology has played an important role in data center. Distributed services deployed in multiple virtual machines, may reside on one physical machine. This situation requires an efficient inter-domain communication channel with transparency and security principles ensured. Although current inter-domain mechanism has gained a much better performance compared to traditional inter-domain path offered by hypervisor, shared data channel size limitation and additional copy are still two restrains against a higher performance efficiency. In this paper, we give an analysis on these limitations, overcome these shortcomings, and achieve a higher efficient inter-domain communication channel. By applying virtual address protection mechanism during channel bootstrap, we enlarge the maximum size of shared data channel. By pointing network packet structure to the buffer in the shared data channel, we avoid an extra data copy on the receiver VM side. In our evaluation using a number of standard benchmarks, we have reduced the latency by nearly 40%, increased the throughput by approximately 45% and cut down more than 3500 CPU cycles per packet. © 2009 IEEE.

关键词： Virtual machine

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A highly efficient inter-domain communication channel

A highly efficient inter-domain communication channel

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IEEE 9th International Conference on computer and Information technology, CIT 2009

作者： Zang, Hongyong Gu, Kuiyan Li, Yaqiong Sun, Yuzhong Meng, Dan Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Dongxin Geology Research Institute of Shengli Oilfield Sinopec Dongying Shandong 257094 China

ISBN: (纸本)9780769538365

With virtual machine technology, distributed services deployed in multiple cooperative virtual machines, such as multi-tier web services, may reside on one physical machine. This situation requires an efficient inter-domain communication channel, and meanwhile transparency and security should be guaranteed, for diverse existing distributed applications are serving on plenty of machines. In this paper, we have implemented a highly efficient inter-domain communication channel, called SChannel, with full transparency to both user applications and network protocol stack, and security between guest domains on Xen platform. Between two co-resident domains, SChannel establishes a twoway shared memory channel with elastic size, which is set up using static shared memory mechanism, instead of high-cost dynamic shared memory. Furthermore, SChannel avoids one additional copy from the shared data channel on the receiver domain side. In our evaluation using a number of standard benchmarks, SChannel increases the throughput 5 times than standard inter-domain mechanism offered by the hypervisor. Compared with other typical transparent inter-domain communication mechanism, SChannel achieves approximately 44.5% improvement of throughput, and reduces more than 3500 CPU cycles per packet. © 2009 IEEE.

关键词： Transparency

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