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Proceedings 1999 IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems (EFT'99)最新文献

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Fault-tolerant refresh power reduction of DRAMs for quasi-nonvolatile data retention 准非易失性数据保留的dram容错刷新功率降低
Y. Katayama, E. Stuckey, S. Morioka, Z. Wu
A quasi-nonvolatile memory system based on commercially available low-power dynamic random access memory (DRAM) technology is proposed and demonstrated. By applying a powerful one-shot Reed-Solomon error correction code (ECC) to the data stored in the DRAM, the refresh rate and memory system power usage can be greatly reduced while still maintaining data integrity. An adaptive refresh rate controller was developed in order to ensure robustness against the variations in data retention time due to perturbation effects such as DRAM part-to-part variations, environmental changes and data pattern sensitivity, while at the same time minimizing power usage. By checking for data failures among a small subset of data bits which are dynamically selected at the beginning of each use of the system, the state of the perturbation effects are predicted and used to adjust the refresh rate. As a result, a system was developed that provides reliability equivalent to standard DRAM systems while greatly (10-100X) reducing the refresh power. Experimental results of a test system are presented.
提出并演示了一种基于市售低功耗动态随机存取存储器(DRAM)技术的准非易失性存储系统。通过对存储在DRAM中的数据应用强大的一次性Reed-Solomon纠错码(ECC),可以在保持数据完整性的同时大大降低刷新率和内存系统功耗。开发了一种自适应刷新率控制器,以确保对扰动效应(如DRAM部件间变化、环境变化和数据模式敏感性)引起的数据保留时间变化的鲁棒性,同时最大限度地减少功耗。通过检查在系统每次使用开始时动态选择的一小部分数据位中的数据故障,预测扰动效应的状态并用于调整刷新率。因此,开发了一种系统,它提供了与标准DRAM系统相当的可靠性,同时大大降低了刷新功率(10-100倍)。给出了测试系统的实验结果。
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引用次数: 31
Charge sharing fault detection for CMOS domino logic circuits CMOS多米诺逻辑电路的电荷共享故障检测
Ching-Hwa Cheng, Shih-Chieh Chang, Jinn-Shyan Wang, W. Jone
Because domino logic design offers smaller area and higher speed than conventional CMOS design, it is very popular in high performance processor design. However, domino logic suffers from several design problems and one of the most notable is the charge sharing problem. In domino logic, there are two operations: the pre-charge phase and the evaluation phase. The charge sharing problem occurs when the charge which is stored at the output node in the pre-charge phase is shared among the junction capacitance of transistors in the evaluation phase. Charge sharing may degrade the output voltage level or even cause an erroneous output value. In this paper, we describe a method to measure the sensitivity of the charge sharing problem for a domino gate. For each domino gate, we compute a value called CS-vulnerability which describes the degree of sensitivity for a domino gate to have the charge sharing problem. In addition, our algorithm also generates test vectors to activate the worst case of the charge sharing problem. We have performed experiments on a large set of MCNC benchmark circuits.
由于多米诺逻辑设计比传统的CMOS设计具有更小的面积和更高的速度,因此在高性能处理器设计中非常流行。然而,domino逻辑有几个设计问题,其中最值得注意的是电荷共享问题。在domino逻辑中,有两个操作:预收费阶段和评估阶段。当预充电阶段存储在输出节点的电荷在评估阶段被晶体管的结电容共享时,就会出现电荷共享问题。电荷共享可能降低输出电压水平,甚至导致错误的输出值。本文描述了一种测量多米诺门电荷共享问题灵敏度的方法。对于每个多米诺骨牌门,我们计算了CS-vulnerability值,该值描述了多米诺骨牌门对电荷共享问题的敏感程度。此外,我们的算法还生成测试向量来激活电荷共享问题的最坏情况。我们在大量的MCNC基准电路上进行了实验。
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引用次数: 19
Time-shared modular redundancy for fault-tolerant FFT processors 容错FFT处理器的分时模块化冗余
V. Piuri, E. Swartzlander
This paper presents an efficient approach to concurrent error detection and correction for FFT processors by using time-shared modular redundancy. Digits of each input operand are partitioned in disjoint subsets: the nominal operations are performed more than once on each subset by using different arithmetic units. Comparison of results allows detection and, possibly, correction of errors. The modified architectures for detection and correction are analyzed and evaluated.
本文提出了一种利用分时模冗余对FFT处理器进行并发错误检测和校正的有效方法。每个输入操作数的数字被划分为不相交的子集:标称运算通过使用不同的算术单位在每个子集上执行多次。比较结果可以发现并可能纠正错误。对改进后的检测和校正体系结构进行了分析和评价。
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引用次数: 2
Low power dissipation in BIST schemes for modified Booth multipliers 改进的Booth乘法器的BIST方案的低功耗
X. Kavousianos, D. Bakalis, H. T. Vergos, D. Nikolos, G. Alexiou
Aiming at low power dissipation during testing, in this paper we present a methodology for deriving a novel BIST scheme for modified Booth multipliers. Reduction of the power dissipation is achieved by: (a) introducing a suitable test pattern generator (TPG) built of a 4-bit binary and a 4-bit Gray counter, (b) properly assigning the TPG outputs to the multiplier inputs and (c) significantly reducing the test set length. The achieved reduction of the total power dissipation is from 44.1% to 54.9%, the average reduction per test vector is from 21.4% to 36.5% while the reduction of the peaks is from 15.8% to 34.3%, depending on the implementation of the basic cells and the size of the MBM. The test application time is also reduced by 28.9% while the introduced BIST scheme implementation overhead is very small.
针对测试过程中的低功耗,本文提出了一种推导改进布斯乘法器的新型BIST方案的方法。降低功耗是通过以下方式实现的:(a)引入一个由4位二进制和4位灰色计数器组成的合适的测试模式发生器(TPG), (b)适当地将TPG输出分配给乘法器输入,以及(c)显着减少测试集长度。根据基本单元的实现和MBM的大小,实现的总功耗降低从44.1%到54.9%,每个测试向量的平均功耗降低从21.4%到36.5%,峰值功耗降低从15.8%到34.3%。测试申请时间也减少了28.9%,同时引入的BIST方案实现开销很小。
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引用次数: 10
Failure tests on 64 Mb SDRAM in radiation environment 辐射环境下64mb SDRAM的失效测试
S. Bertazzoni, G. Cardarilli, D. Piergentili, M. Salmeri, A. Salsano, D. D. Giovenale, G. C. Grande, P. Marinucci, S. Sperandei, S. Bartalucci, G. Mazzenga, M. Ricci, V. Bidoli, D. D. Francesco, P. Picozza, A. Rovelli
In this paper we analyze the failures of Commercial Off The Shelf (COTS) 64 Mb Synchronous DRAM (SDRAM) in a radiation environment. The experimental setup, the test procedure, and the results of three different test runs at the Catania LNS-INFN cyclotron are described in some detail. Three kinds of heavy ions were used to test devices under different conditions of energy release that generates different amount of charge inside the chip. In particular, 30 MeV/AMU /sup 93/Nb (LET/sub Si//spl sim/21 MeV/(mg/cm/sup 2/), R/sub Si//spl sim/397 /spl mu/m), 30 MeV/AMU /sup 120/Sn (LET/sub Si//spl sim/30 MeV/(mg/cm/sup 2/), R/sub Si//spl sim/370 /spl mu/m) and 15 MeV/AMU /sup 197/Au (LET/sub Si//spl sim/90 MeV/(mg/cm/sup 2/), R/sub Si//spl sim/95 /spl mu/m) were used. In all cases, the bare dies were directly bonded on an AF4 carrier to avoid plastic and lead-frame shielding. Different failure types that could affect the operations of a system based on this device were registered. To verify that the characteristics of the events depend on the zone struck by the particle, a specific test was performed.
本文分析了商用现货64mb同步DRAM (SDRAM)在辐射环境下的故障。详细介绍了卡塔尼亚LNS-INFN回旋加速器的实验装置、测试过程和三次不同的测试结果。三种重离子在不同的能量释放条件下对器件进行测试,从而在芯片内部产生不同的电荷量。其中,30 MeV/AMU /sup 93/Nb (LET/sub Si//spl sim/21 MeV/(mg/cm/sup 2/))、R/sub Si//spl sim/397 /spl mu/m)、30 MeV/AMU /sup 120/Sn (LET/sub Si//spl sim/30 MeV/(mg/cm/sup 2/)、R/sub Si//spl sim/370 /spl mu/m)和15 MeV/AMU /sup 197/Au (LET/sub Si//spl sim/90 MeV/(mg/cm/sup 2/)、R/sub Si//spl sim/95 /spl mu/m)。在所有情况下,裸模直接粘合在AF4载体上,以避免塑料和铅框架屏蔽。可能影响基于该设备的系统运行的不同故障类型被注册。为了验证事件的特征取决于粒子撞击的区域,进行了具体的测试。
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引用次数: 9
Testing for path delay faults using test points 使用测试点测试路径延迟故障
S. Tragoudas, N. Denny
Path delay fault testing is often difficult due to the large number of paths that must be tested. Inserting controllable/observable points in the test architecture has been shown to be a viable method for reducing the number of paths that need to be tested in a circuit. Test points allow the tester to test subpaths of the circuit and then draw conclusions of the operability of the circuit based upon the delays of subpaths. We illustrate some of the limitations of current subpath testing procedures and illustrate some of the difficulties associated with unstructured test point placement. We give an implementation of test points embedded in a scan chain and present a new testing technique that is more accurate than the previous method. We also present a novel test point insertion approach that has reasonable test times and minimal impact on the hardware size and the operational clock.
路径延迟故障测试通常是困难的,因为必须测试大量的路径。在测试架构中插入可控/可观察点已被证明是减少电路中需要测试的路径数量的可行方法。测试点允许测试人员测试电路的子路径,然后根据子路径的延迟得出电路的可操作性结论。我们说明了当前子路径测试过程的一些限制,并说明了与非结构化测试点放置相关的一些困难。本文给出了一种测试点嵌入扫描链的实现方法,并提出了一种新的测试技术,该技术比以前的方法更精确。我们还提出了一种新的测试点插入方法,该方法具有合理的测试时间,并且对硬件尺寸和操作时钟的影响最小。
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引用次数: 11
Algorithms for efficient runtime fault recovery on diverse FPGA architectures 在不同FPGA架构上有效的运行时故障恢复算法
J. Lach, W. Mangione-Smith, M. Potkonjak
The inherent redundancy and in-the-field reconfiguration capabilities of field programmable gate arrays (FPGAs) provide alternatives to integrated circuit redundancy-based fault recovery techniques. An algorithm for efficient runtime recovery from permanent logic faults in the Xilinx 4000 architecture has been expanded to include interconnect fault recovery and has been applied to a diverse set of FPGA architectures. The post-fault-detection system downtime is minimized, and the end user need not have access to computer-aided design (CAD) tools, making the algorithm completely transparent to system users. Although some architectural features allow for a more efficient implementation, high levels of fault recovery with low timing and resource overhead can be achieved on these diverse architectures.
现场可编程门阵列(fpga)固有的冗余和现场重构能力为基于集成电路冗余的故障恢复技术提供了替代方案。Xilinx 4000架构中用于从永久逻辑故障中高效运行时恢复的算法已经扩展到包括互连故障恢复,并已应用于各种FPGA架构。故障检测后的系统停机时间被最小化,并且最终用户不需要访问计算机辅助设计(CAD)工具,使算法对系统用户完全透明。尽管一些体系结构特性允许更有效的实现,但在这些不同的体系结构上可以实现具有低时间和资源开销的高级别故障恢复。
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引用次数: 28
RAMSES: a fast memory fault simulator RAMSES:快速内存故障模拟器
Chi-Feng Wu, Chih-Tsun Huang, Cheng-Wen Wu
In this paper, we present a memory fault simulator called the Random Access Memory Simulator for Error Screening (RAMSES). Although it was designed based on some well-known memory fault models, the algorithm that we developed ensures that new fault models can be included easily by adding new fault descriptors instead of modifying the algorithm or program. With RAMSES, the time complexity of memory fault simulation is improved from O(N/sup 3/) to O(N/sup 2/), where N is the memory capacity in terns of bits. Our approach requires only a small amount of extra memory space. Simulation results by RAMSES show that running the proposed cocktail-March tests can significantly reduce the test time. With the help of RAMSES, an efficient test algorithm called March-CW was developed for word-oriented memories.
在本文中,我们提出了一种存储器故障模拟器,称为错误筛选随机存取存储器模拟器(RAMSES)。虽然该算法是基于一些已知的内存故障模型设计的,但我们所开发的算法保证了通过添加新的故障描述符而不是修改算法或程序可以很容易地包含新的故障模型。RAMSES将内存故障模拟的时间复杂度从0 (N/sup 3/)提高到O(N/sup 2/),其中N为内存容量,单位为比特。我们的方法只需要少量的额外内存空间。RAMSES仿真结果表明,采用该方法可以显著缩短测试时间。在RAMSES的帮助下,开发了一种高效的面向词记忆测试算法March-CW。
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引用次数: 84
A structural approach for space compaction for sequential circuits 顺序电路空间压缩的一种结构方法
M. Seuring, M. Gössel
In this paper a new structural method for linear output space compaction for synchronous sequential circuits is presented. Based on simple estimates for the probabilities of the existence of sensitized paths from the signal lines to the circuit outputs, optimal output partitions are determined without fault simulation. The method is developed for concurrent checking, but as the experimental results show, it is also effectively applicable in pseudo-random test mode.
本文提出了同步顺序电路线性输出空间压缩的一种新的结构方法。基于简单估计从信号线到电路输出存在敏化路径的概率,在不进行故障仿真的情况下确定最优输出分区。该方法是为并发检测而开发的,但实验结果表明,该方法同样有效地适用于伪随机测试模式。
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引用次数: 1
A methodology for efficient simulation and diagnosis of mixed-signal systems using error waveforms 一种利用误差波形对混合信号系统进行有效仿真和诊断的方法
S. Cherubal, A. Chatterjee
In this paper we present a novel approach for fast fault simulation of digital faults in mixed-signal systems without resorting to expensive mixed-signal simulation for every fault. The approach is based on partitioning the mixed-signal circuit and representing digital fault effects using error waveforms. We propose methods to compress a large number of digital fault effects into a few fault syndromes. This results in significant savings in fault simulation effort. We demonstrate the ability to differentiate fault syndromes of different partitions of the circuit.
本文提出了一种新的方法来快速模拟混合信号系统中的数字故障,而不需要对每个故障进行昂贵的混合信号模拟。该方法基于对混合信号电路进行划分,并用误差波形表示数字故障效应。我们提出了将大量的数字故障效应压缩成几个故障综合征的方法。这大大节省了故障模拟工作。我们展示了区分电路不同分区的故障综合征的能力。
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引用次数: 1
期刊
Proceedings 1999 IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems (EFT'99)
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