FAULT DIAGNOSIS IN A MEMORY BIST ENVIRONMENT
    72.
    发明申请
    FAULT DIAGNOSIS IN A MEMORY BIST ENVIRONMENT 审中-公开
    记忆环境中的故障​​诊断

    公开(公告)号:US20110055646A1

    公开(公告)日:2011-03-03

    申请号:US12678747

    申请日:2008-09-18

    IPC分类号: G11C29/12 G06F11/27

    摘要: Disclosed are methods and devices for temporally compacting test response signatures of failed memory tests in a memory built-in self-test environment, to provide the ability to carry on memory built-in self-test operations even with the detection of multiple time related memory test failures. In some implementations of the invention, the compacted test response signatures are provided to an automated test equipment device along with memory location information. According to various implementations of the invention, an integrated circuit with embedded memory (204) and a memory BIST controller (206) also includes a linear feed-back structure (410) for use as a signature register that can temporally compact test response signatures from the embedded memory array during a test step of a memory test. In various implementations the integrated circuit may also include a failing words counter (211), a failing column indicator (213), and/or a failing row indicator (214) to collect memory location information for a failing test response.

    摘要翻译: 公开的是用于在存储器内置自检环境中暂时压缩失败存储器测试的测试响应签名的方法和设备,以提供即使在多个时间相关存储器的检测中进行存储器内置自检操作的能力 测试失败。 在本发明的一些实施方案中,将压实的测试响应签名与存储器位置信息一起提供给自动测试设备设备。 根据本发明的各种实施方式,具有嵌入式存储器(204)和存储器BIST控制器(206)的集成电路还包括用作签名寄存器的线性反馈结构(410),其可以临时压缩来自 在内存测试的测试步骤中的嵌入式存储器阵列。 在各种实现中,集成电路还可以包括故障字计数器(211),故障列指示器(213)和/或故障行指示器(214),以收集故障测试响应的存储器位置信息。

    Scan Test Application Through High-Speed Serial Input/Outputs
    73.
    发明申请
    Scan Test Application Through High-Speed Serial Input/Outputs 有权
    通过高速串行输入/输出进行扫描测试应用

    公开(公告)号:US20100313089A1

    公开(公告)日:2010-12-09

    申请号:US12506250

    申请日:2009-07-20

    IPC分类号: G01R31/3177 G06F11/25

    CPC分类号: G01R31/318547

    摘要: Methods and devices for using high-speed serial links for scan testing are disclosed. The methods can work with any scheme of scan data compression or with uncompressed scan testing. The protocol and hardware to support high speed data transfer reside on both the tester and the device under test. Control data may be transferred along with scan data or be partially generated on chip. Clock signals for testing may be generated on chip as well. In various implementations, the SerDes (Serializer/Deserializer) may be shared with other applications. The Aurora Protocol may be used to transport industry standard protocols. To compensate for effects of asynchronous operation of a conventional high-speed serial link, buffers may be used. The high-speed serial interface may use a data conversion block to drive test cores.

    摘要翻译: 公开了使用高速串行链路进行扫描测试的方法和装置。 这些方法可以使用任何扫描数据压缩或未压缩扫描测试方案。 支持高速数据传输的协议和硬件位于测试仪和被测设备上。 控制数据可以与扫描数据一起传输或者在芯片上部分产生。 用于测试的时钟信号也可以在芯片上生成。 在各种实现中,SerDes(串行器/解串器)可以与其他应用共享。 极光协议可用于传输行业标准协议。 为了补偿常规高速串行链路的异步操作的效果,可以使用缓冲器。 高速串行接口可以使用数据转换块来驱动测试核心。

    Method and apparatus for selectively compacting test responses
    74.
    发明授权
    Method and apparatus for selectively compacting test responses 有权
    用于选择性压实测试响应的方法和装置

    公开(公告)号:US07805649B2

    公开(公告)日:2010-09-28

    申请号:US12396377

    申请日:2009-03-02

    IPC分类号: G01R31/28

    CPC分类号: G01R31/318547

    摘要: A method and apparatus to compact test responses containing unknown values or multiple fault effects in a deterministic test environment. The proposed selective compactor employs a linear compactor with selection circuitry for selectively passing test responses to the compactor. In one embodiment, gating logic is controlled by a control register, a decoder, and flag registers. This circuitry, in conjunction with any conventional parallel test-response compaction scheme, allows control circuitry to selectively enable serial outputs of desired scan chains to be fed into a parallel compactor at a particular clock rate. A first flag register determines whether all, or only some, scan chain outputs are enabled and fed through the compactor. A second flag register determines if the scan chain selected by the selector register is enabled and all other scan chains are disabled, or the selected scan chain is disabled and all other scan chains are enabled. Other embodiments allow selective masking of a variable number of scan chain outputs.

    摘要翻译: 一种在确定性测试环境中压缩包含未知值或多个故障效应的测试响应的方法和装置。 所提出的选择性压实机采用具有用于选择性地将测试响应传递给压实机的选择电路的线性压实机。 在一个实施例中,门控逻辑由控制寄存器,解码器和标志寄存器控制。 该电路结合任何常规的并行测试响应压缩方案,允许控制电路选择性地使所需扫描链的串行输出以特定时钟速率馈送到并联压实机。 第一个标志寄存器确定是否启用所有或只有一些扫描链输出并通过压实器馈送。 第二个标志寄存器确定选择器寄存器选择的扫描链是否启用,所有其他扫描链是禁用的,还是禁用所选扫描链,并启用所有其他扫描链。 其他实施例允许对可变数目的扫描链输出的选择性掩蔽。

    System, method, and computer program product for smoothing
    76.
    发明申请
    System, method, and computer program product for smoothing 有权
    系统,方法和计算机程序产品进行平滑处理

    公开(公告)号:US20100226589A1

    公开(公告)日:2010-09-09

    申请号:US10716386

    申请日:2003-11-18

    IPC分类号: G06K9/40

    CPC分类号: G06T17/20 G06T17/205

    摘要: A system and method for a hybrid, variational, user-controlled, 3D mesh smoothing for orphaned shell meshes. The smoothing model is based on a variational combination of energy and equi-potential minimization theories. A variety of smoothing techniques for predicting a new location for the node-to-smooth are employed. Each node is moved according to a specific smoothing algorithm so as to keep element included angles, skew and distortion to a minimum. The variational smoother selection logic is based on nodal valency and element connectivity pattern of the node to smooth. Results show its consistency with both quadrilateral and quad-dominant meshes with a significant gain over conventional Laplacian schemes in terms of mesh quality, stability, user control and flexibility.

    摘要翻译: 用于孤立壳网格的混合,变体,用户控制的3D网格平滑的系统和方法。 平滑模型基于能量和等效电位最小化理论的变分组合。 采用各种用于预测节点到光滑的新位置的平滑技术。 每个节点根据特定的平滑算法移动,以将元素的夹角,偏斜和失真保持在最小。 变分平滑器选择逻辑基于节点的节点价值和元素连通性模式来平滑。 在网格质量,稳定性,用户控制和灵活性方面,结果表明其与四边形和四重主要网格的一致性在传统拉普拉斯算法方面具有显着的增益。

    CONTINUOUS APPLICATION AND DECOMPRESSION OF TEST PATTERNS TO A CIRCUIT-UNDER-TEST
    77.
    发明申请
    CONTINUOUS APPLICATION AND DECOMPRESSION OF TEST PATTERNS TO A CIRCUIT-UNDER-TEST 有权
    测试模式的连续应用和分解到电路测试

    公开(公告)号:US20090183041A1

    公开(公告)日:2009-07-16

    申请号:US12352994

    申请日:2009-01-13

    IPC分类号: G01R31/3177 G06F11/25

    摘要: A method for applying test patterns to scan chains in a circuit-under-test. The method includes providing a compressed test pattern of bits; decompressing the compressed test pattern into a decompressed test pattern of bits as the compressed test pattern is being provided; and applying the decompressed test pattern to scan chains of the circuit-under-test. The actions of providing the compressed test pattern, decompressing the compressed test pattern, and applying the decompressed pattern are performed synchronously at the same or different clock rates, depending on the way in which the decompressed bits are to be generated. A circuit that performs the decompression includes a decompressor such as a linear feedbackstate machine adapted to receive a compressed test pattern of bits. The decompressor decompresses the test pattern into a decompressed test pattern of bits as the compressed test pattern is being received. The circuit further includes scan chains for testing circuit logic, the scan chains coupled to the decompressor and adapted to receive the decompressed test pattern.

    摘要翻译: 在测试电路中将测试图案应用于扫描链的方法。 该方法包括提供比特的压缩测试模式; 将压缩的测试图案解压缩为被提供的压缩测试图案的解压缩测试图案; 以及将解压缩的测试图案应用于扫描电路被测电路。 取决于要生成解压缩位的方式,以相同或不同的时钟速率同步地执行提供压缩测试模式,解压缩压缩测试模式和应用解压缩模式的动作。 执行解压缩的电路包括解压缩器,例如适于接收压缩的比特测试模式的线性反馈状态机。 解压缩器将压缩的测试模式正在接收时,将测试模式解压缩为解压缩的位测试模式。 电路还包括用于测试电路逻辑的扫描链,扫描链耦合到解压缩器并且适于接收解压缩的测试图案。

    DECOMPRESSOR/PRPG FOR APPLYING PSEUDO-RANDOM AND DETERMINISTIC TEST PATTERNS
    78.
    发明申请
    DECOMPRESSOR/PRPG FOR APPLYING PSEUDO-RANDOM AND DETERMINISTIC TEST PATTERNS 有权
    适用于伪随机和确定性测试模式的解码器/ PRPG

    公开(公告)号:US20090177933A1

    公开(公告)日:2009-07-09

    申请号:US12402880

    申请日:2009-03-12

    IPC分类号: G01R31/3177 G06F11/25

    摘要: A novel decompressor/PRPG on a microchip performs both pseudo-random test pattern generation and decompression of deterministic test patterns for a circuit-under-test on the chip. The decompressor/PRPG has two phases of operation. In a pseudo-random phase, the decompressor/PRPG generates pseudo-random test patterns that are applied to scan chains within the circuit-under test. In a deterministic phase, compressed deterministic test patterns from an external tester are applied to the decompressor/PRPG. The patterns are decompressed as they are clocked through the decompressor/PRPG into the scan chains. The decompressor/PRPG thus provides much better fault coverage than a simple PRPG, but without the cost of a complete set of fully-specified deterministic test patterns.

    摘要翻译: 微芯片上的新型解压缩器/ PRPG对芯片上的电路不足测试的确定性测试模式进行伪随机测试模式生成和解压缩。 解压缩器/ PRPG有两个操作阶段。 在伪随机阶段,解压缩器/ PRPG生成伪随机测试图案,其应用于被测电路中的扫描链。 在确定性阶段,将外部测试仪的压缩确定性测试模式应用于解压缩器/ PRPG。 在通过解压缩器/ PRPG计时到扫描链中时,模式被解压缩。 因此,解压缩器/ PRPG提供比简单PRPG更好的故障覆盖,但是没有完整的完整指定的确定性测试模式的成本。

    On-chip comparison and response collection tools and techniques
    79.
    发明申请
    On-chip comparison and response collection tools and techniques 有权
    片上比较和响应收集工具和技术

    公开(公告)号:US20070234163A1

    公开(公告)日:2007-10-04

    申请号:US11709079

    申请日:2007-02-20

    IPC分类号: G06F11/00 G01R31/28

    摘要: Disclosed herein are exemplary embodiments of a so-called “X-press” test response compactor. Certain embodiments of the disclosed compactor comprise an overdrive section and scan chain selection logic. Certain embodiments of the disclosed technology offer compaction ratios on the order of 1000×. Exemplary embodiments of the disclosed compactor can maintain about the same coverage and about the same diagnostic resolution as that of conventional scan-based test scenarios. Some embodiments of a scan chain selection scheme can significantly reduce or entirely eliminate unknown states occurring in test responses that enter the compactor. Also disclosed herein are embodiments of on-chip comparator circuits and methods for generating control circuitry for masking selection circuits.

    摘要翻译: 这里公开了所谓的“X-press”测试响应压实机的示例性实施例。 所公开的压实机的某些实施例包括过驱动部分和扫描链选择逻辑。 所公开技术的某些实施例提供约1000x的压实比。 所公开的压实机的示例性实施例可以保持与传统的基于扫描的测试场景相同的覆盖范围和大约相同的诊断分辨率。 扫描链选择方案的一些实施例可以显着地减少或完全消除在进入压实机的测试响应中发生的未知状态。 本文还公开了片上比较器电路和用于产生用于屏蔽选择电路的控制电路的方法的实施例。

    Test pattern compression for an integrated circuit test environment
    80.
    发明申请
    Test pattern compression for an integrated circuit test environment 有权
    用于集成电路测试环境的测试模式压缩

    公开(公告)号:US20070016836A1

    公开(公告)日:2007-01-18

    申请号:US11523111

    申请日:2006-09-18

    IPC分类号: G01R31/28

    摘要: A method for compressing test patterns to be applied to scan chains in a circuit under test. The method includes generating symbolic expressions that are associated with scan cells within the scan chains. The symbolic expressions are created by assigning variables to bits on external input channels supplied to the circuit under test. Using symbolic simulation, the variables are applied to a decompressor to obtain the symbolic expressions. A test cube is created using a deterministic pattern that assigns values to the scan cells to test faults within the integrated circuit. A set of equations is formulated by equating the assigned values in the test cube to the symbolic expressions associated with the corresponding scan cell. The equations are solved to obtain the compressed test pattern.

    摘要翻译: 一种用于压缩被测电路中扫描链应用的测试图案的方法。 该方法包括生成与扫描链内的扫描单元相关联的符号表达式。 通过将变量分配给提供给被测电路的外部输入通道上的位来创建符号表达式。 使用符号仿真,将变量应用于解压缩器以获取符号表达式。 使用确定性模式创建测试立方体,该模式为扫描单元分配值以测试集成电路中的故障。 通过将测试立方体中的分配值与与相应扫描单元相关联的符号表达式进行等价来表示一组方程式。 求解等式以获得压缩测试图案。