共查询到18条相似文献,搜索用时 125 毫秒
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从可测性设计与VLSI测试、VLSI设计之间的关系出发,将与可测性设计相关的VLSI测试方法学、设计方法学的内容有机地融合在一起。文中简要地介绍了VLSI可测性设计的理论基础和技术种类,简明地评述了可测性设计的现状和发展趋势,并且探讨了可测性设计的实现方法。 相似文献
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DFT技术已经成为集成电路设计的一个重要组成部分.详细介绍了基于扫描测试的DFT原理和实现步骤,并对一个32位FIFO存储器电路实例进行扫描设计.根据扫描链的特点和电路多时钟域问题,采用了三种设计方案,整个流程包括了行为级Verilog代码的修改、扫描设计综合以及自动测试模板产生(ATPG).对不同的设计方案给出了相应的故障覆盖率,并对生成的模板进行压缩优化,减少了测试仿真时间.最后分析了导致故障覆盖率不同的一些因素和设计中的综合考虑. 相似文献
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本文提出了多链扫描可测性设计中扫描链的构造方法。根据电路的规模,输入/输出管脚数及测试时间的要求确定扫描链个数,引入临界时间的概念,采用动态编程的方法确定每条链中的扫描触发器;采用该方法,计算速度比传统方法显著提高,同时节省了存储空间。 相似文献
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本文针对固定管脚芯片可测性设计中测试向量庞大和测试时间过长问题,提出了一种有效的压缩可测性设计,改进了传统并行扫描测试设计。该设计方法在SMIC 0.18μm工艺下一款电力载波通信芯片设计中验证,仿真结果表明压缩扫描可测性设计能有效减少测试向量数目,从而减小芯片测试时间。 相似文献
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扫描测试和扫描链的构造 总被引:3,自引:0,他引:3
本文首先论述了扫描设计与测试向量自动生成(ATPG)这种测试方法的关键技术,并由此为依据,提出部分扫描设计中,扫描链构造的分层次的三个选取原则。 相似文献
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In this paper, we show that not every scan cell contributes equally to the power consumption during scan-based test. The transitions
at some scan cells cause more toggles at the internal signal lines of a circuit than the transitions at other scan cells.
Hence the transitions at these scan cells have a larger impact on the power consumption during test application. We call these
scan cells power sensitive scan cells. A signal probability based approach is proposed to identify a set of power sensitive
scan cells. Additional hardware is added to freeze the outputs of power sensitive scan cells during scan shifting in order
to reduce the shift power consumption. Experimental results on industrial circuits show that on average more than 45% of the
scan shift power can be eliminated when freezing only 5% of power sensitive scan cells.
相似文献
Yu HuangEmail: |
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This paper discusses an automated method to divide scan chains into multiple scan segments that are suitable for power-constrained
at-speed testing using the skewed-load test application strategy. By dividing a circuit into multiple partitions, which can
be tested independently, both power during shift and power during capture can be controlled. Despite activating one partition
at a time, we show how through conscious construction of scan segments, high transition fault coverage can be achieved, while
reducing test time of the circuit and employing third party test generation tools.
相似文献
Nicola NicoliciEmail: |
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A new scan partition architecture to reduce both the average and peak power dissipation during scan testing is proposed for low‐power embedded systems. In scan‐based testing, due to the extremely high switching activity during the scan shift operation, the power consumption increases considerably. In addition, the reduced correlation between consecutive test patterns may increase the power consumed during the capture cycle. In the proposed architecture, only a subset of scan cells is loaded with test stimulus and captured with test responses by freezing the remaining scan cells according to the spectrum of unspecified bits in the test cubes. To optimize the proposed process, a novel graph‐based heuristic to partition the scan chain into several segments and a technique to increase the number of don't cares in the given test set have been developed. Experimental results on large ISCAS89 benchmark circuits show that the proposed technique, compared to the traditional full scan scheme, can reduce both the average switching activities and the average peak switching activities by 92.37% and 41.21%, respectively. 相似文献
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分析了混合信号边界扫描测试的工作机制对测试系统的功能需求,实现了符合IEEE1149.4标准的混合信号边界扫描测试系统。仿真和测试实践表明,该测试系统具有对系统级、PCB级和芯片级电路进行简单互连测试、差分测试和参数测试等功能,结构简单、携带方便、工作可靠。 相似文献
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提出了一种新的并行扫描结构。扫描触发器的选择采用BALLAST算法。该结构采用译码的方式依次选通每个扫描小组,使得扫描小组中的存储元件并行地控制和观测。测试产生和响应时间比串行扫描法快K倍(K为并行度),而硬件耗费比多链扫描法和传统的并行扫描结构小很多。 相似文献
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