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1.发明授权Method and system for measuring signal propagation delays using ring oscillators 失效使用环形振荡器测量信号传播延迟的方法和系统公开(公告)号：US06219305B1
公开(公告)日：2001-04-17
申请号：US09114369
申请日：1998-07-14
申请人： Robert D. Patrie , Robert W. Wells , Steven P. Young , Christopher H. Kingsley , Daniel Chung , Robert O. Conn
发明人： Robert D. Patrie , Robert W. Wells , Steven P. Young , Christopher H. Kingsley , Daniel Chung , Robert O. Conn
IPC分类号： G04F800
CPC分类号： G01R27/04 , G01R31/2853 , G01R31/2882 , G01R31/3016 , G01R31/31725 , G01R31/318516
摘要： A circuit measures the signal propagation delay through a selected test circuit. The test circuit is provided with an inverting feedback path so that the test circuit and feedback path together form a free-running oscillator. The oscillator then automatically provides its own test signal that includes alternating rising and falling signal transitions on the test-circuit input node. These signal transitions are counted over a predetermined time period to establish the average period of the oscillator. Finally, the average period of the oscillator is related to the average signal propagation delay through the test circuit. One embodiment of the invention includes a phase discriminator that samples the output of the oscillator and accumulates data representing the duty cycle of that signal. The duty cycle can then be combined with the average period of the test signal to determine, separately, the delays associated with falling and rising edges propagating through the test circuit.
摘要翻译： 电路通过选定的测试电路测量信号传播延迟。 测试电路设置有反相反馈路径，使得测试电路和反馈路径一起形成自由振荡的振荡器。 然后振荡器自动提供自己的测试信号，包括在测试电路输入节点上交替的上升和下降信号转换。 这些信号转换在预定的时间周期内进行计数以建立振荡器的平均周期。 最后，振荡器的平均周期与通过测试电路的平均信号传播延迟有关。 本发明的一个实施例包括相位鉴别器，其对振荡器的输出进行采样并累加表示该信号的占空比的数据。 然后可以将占空比与测试信号的平均周期组合，以分别确定与通过测试电路传播的下降沿和上升沿相关联的延迟。
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2.发明授权Method and system for measuring signal propagation delays using the duty cycle of a ring oscillator 失效使用环形振荡器的占空比测量信号传播延迟的方法和系统
公开(公告)号：US6069849A
公开(公告)日：2000-05-30
申请号：US115138
申请日：1998-07-14
IPC分类号： G01R27/04 , G01R31/28 , G01R31/30 , G01R31/317 , G01R31/3185 , G04F8/00 , G01R15/12
CPC分类号： G01R27/04 , G01R31/2853 , G01R31/2882 , G01R31/3016 , G01R31/31725 , G01R31/318516
摘要： A circuit measures the signal propagation delay through a selected test circuit. The test circuit is provided with a feedback path so that the test circuit and feedback path together form a free-running oscillator. The oscillator then automatically provides its own test signal that includes alternating rising and falling signal transitions on the test-circuit input node. These signal transitions are counted over a predetermined time period to establish the average period of the oscillator. Finally, the average period of the oscillator is related to the average signal propagation delay through the test circuit. A phase discriminator samples the output of the oscillator and accumulates data representing the duty cycle of that signal. The duty cycle can then be combined with the average period of the test signal to determine, separately, the delays associated with falling and rising edges propagating through the test circuit.
摘要翻译： 电路通过选定的测试电路测量信号传播延迟。 测试电路设置有反馈路径，使得测试电路和反馈路径一起形成自由振荡的振荡器。 然后振荡器自动提供自己的测试信号，包括在测试电路输入节点上交替的上升和下降信号转换。 这些信号转换在预定的时间周期内进行计数以建立振荡器的平均周期。 最后，振荡器的平均周期与通过测试电路的平均信号传播延迟有关。 相位鉴别器对振荡器的输出采样，并累加表示该信号占空比的数据。 然后可以将占空比与测试信号的平均周期组合，以分别确定与通过测试电路传播的下降沿和上升沿相关联的延迟。
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3.发明授权System with downstream set or clear for measuring signal propagation delays on integrated circuits 有权具有下行设置或清除功能的系统用于测量集成电路上的信号传播延迟
公开(公告)号：US6075418A
公开(公告)日：2000-06-13
申请号：US235419
申请日：1999-01-20
IPC分类号： G01R31/30 , G01R31/317 , G01R31/3185 , G01R31/3193 , G04F10/02 , H03B5/02
CPC分类号： G01R31/31937 , G01R31/31725 , G01R31/3016 , G01R31/318516 , Y10S331/03
摘要： A circuit separately measures a selected one of the rising-edge and falling-edge signal propagation delays through one or more circuits of interest. A number of synchronous components are configured in a loop so that they together form a free-running ring oscillator. Each synchronous component clocks a subsequent synchronous component in the ring; the subsequent synchronous component responds by clocking a later component in the ring and by clearing a previous component to prepare it for a subsequent clock. The oscillator thus produces an oscillating test signal in which the period is proportional to the clock-to-out delays of synchronous components. This proportionality provides an effective means for measuring the clock-to-out delays of those components. Other embodiments include additional asynchronous test circuit paths for which the associated signal propagation delays are of interest.
摘要翻译： 电路单独测量通过感兴趣的一个或多个电路的上升沿和下降沿信号传播延迟中的所选择的一个。 多个同步组件被配置在一个循环中，使它们一起形成一个自由运行的环形振荡器。 每个同步分量对环中的后续同步分量进行计时; 随后的同步组件通过对环中的稍后的组件计时并通过清除先前的组件来准备后续时钟来进行响应。 因此，振荡器产生振荡测试信号，其中周期与同步分量的时钟到输出延迟成比例。 这种比例性提供了测量这些组件的时钟到输出延迟的有效手段。 其他实施例包括关联的信号传播延迟对其感兴趣的额外的异步测试电路路径。
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公开(公告)号：US06232845B1
公开(公告)日：2001-05-15
申请号：US09360350
申请日：1999-07-22
IPC分类号： G11C2900
CPC分类号： G11C29/028 , G01R27/04 , G01R31/2853 , G01R31/2882 , G01R31/3016 , G01R31/31725 , G01R31/318516 , G01R31/31937 , G11C29/50012
摘要： A circuit measures a signal propagation delay through a series of memory elements. In one embodiment the memory elements are configured in series so that together they form a delay circuit. In another embodiment the memory elements are configured in a loop to form a ring oscillator. Each memory element propagates a signal to a subsequent memory element so that the time the signal takes to traverse all of the memory elements is proportional to the average delay induced by the individual elements. This proportionality provides an effective means for measuring the delays of those components. Various embodiments of the invention measure the speeds at which memory elements can be preset, cleared, written to, read from, or clock enabled.
摘要翻译： 电路通过一系列存储器元件测量信号传播延迟。 在一个实施例中，存储器元件被串联构造，使得它们一起形成延迟电路。 在另一个实施例中，存储器元件被配置成环路以形成环形振荡器。 每个存储器元件将信号传播到后续存储器元件，使得信号经过所有存储器元件的时间与由各个元件引起的平均延迟成比例。 这种相称性为测量这些部件的延迟提供了有效手段。 本发明的各种实施例测量存储器元件可被预置，清除，写入，读取或启用时钟的速度。
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公开(公告)号：US06611477B1
公开(公告)日：2003-08-26
申请号：US10132419
申请日：2002-04-24
申请人： Gil A. Speyer , David L. Ferguson , Daniel Y. Chung , Robert D. Patrie , Robert W. Wells , Robert O. Conn
发明人： Gil A. Speyer , David L. Ferguson , Daniel Y. Chung , Robert D. Patrie , Robert W. Wells , Robert O. Conn
IPC分类号： G04F800
CPC分类号： G01R31/3016 , G01R27/04 , G01R31/2853 , G01R31/2882 , G01R31/31725 , G01R31/318516
摘要： A circuit measures the signal propagation delay through a selected test circuit. The test circuit is provided with a feedback path so that the test circuit and feedback path together form a free-running oscillator. The oscillator then automatically provides its own test signal that includes alternating rising and falling signal transitions on the test-circuit input node. A phase discriminator samples the output of the oscillator and accumulates data representing the signal propagation delay of either rising or falling signal transitions propagating through the test circuit. The worst-case delay associated with the test circuit can then be expressed as the longer of the two. Knowing the precise worst-case delay allows IC A designers to minimize the guard band and consequently guarantee higher speed performance.
摘要翻译： 电路通过选定的测试电路测量信号传播延迟。 测试电路设置有反馈路径，使得测试电路和反馈路径一起形成自由振荡的振荡器。 然后振荡器自动提供自己的测试信号，包括在测试电路输入节点上交替的上升和下降信号转换。 相位鉴别器对振荡器的输出进行采样，并累加表示通过测试电路传播的上升或下降信号转换的信号传播延迟的数据。 然后，与测试电路相关的最差情况延迟可以表示为两者中较长的时间。 了解精确的最坏情况延迟允许IC A设计者将保护带最小化，从而保证更高的速度性能。
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公开(公告)号：US06466520B1
公开(公告)日：2002-10-15
申请号：US09244753
申请日：1999-02-05
申请人： Gil A. Speyer , David L. Ferguson , Daniel Y. Chung , Robert D. Patrie , Robert W. Wells , Robert O. Conn
发明人： Gil A. Speyer , David L. Ferguson , Daniel Y. Chung , Robert D. Patrie , Robert W. Wells , Robert O. Conn
IPC分类号： G04F800
CPC分类号： G01R31/3016 , G01R27/04 , G01R31/2853 , G01R31/2882 , G01R31/31725 , G01R31/318516
摘要： A circuit measures the signal propagation delay through a selected test circuit. The test circuit is provided with a feedback path so that the test circuit and feedback path together form a free-running oscillator. The oscillator then automatically provides its own test signal that includes alternating rising and falling signal transitions on the test-circuit input node. A phase discriminator samples the output of the oscillator and accumulates data representing the signal propagation delay of either rising or falling signal transitions propagating through the test circuit. The worst-case delay associated with the test circuit can then be expressed as the longer of the two. Knowing the precise worst-case delay allows IC designers to minimize the guard band and consequently guarantee higher speed performance.
摘要翻译： 电路通过选定的测试电路测量信号传播延迟。 测试电路设置有反馈路径，使得测试电路和反馈路径一起形成自由振荡的振荡器。 然后振荡器自动提供自己的测试信号，包括在测试电路输入节点上交替的上升和下降信号转换。 相位鉴别器对振荡器的输出进行采样，并累加表示通过测试电路传播的上升或下降信号转换的信号传播延迟的数据。 与测试电路相关的最坏情况延迟可以表示为两者中较长的时间。 了解精确的最坏情况延迟允许IC设计者将保护带最小化，从而保证更高的速度性能。
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公开(公告)号：US06356514B1
公开(公告)日：2002-03-12
申请号：US09816712
申请日：2001-03-23
IPC分类号： G04F800
CPC分类号： G01R31/3016 , G01R27/04 , G01R31/2853 , G01R31/2882 , G01R31/31725 , G01R31/318516 , G01R31/31937
摘要： A circuit measures the signal propagation delay through a selected test circuit. The test circuit is provided with a feedback path so that the test circuit and feedback path together form a free-running oscillator. The oscillator then automatically provides its own test signal that includes alternating rising and falling signal transitions on the test-circuit input node. These signal transitions are counted over a predetermined time period to establish the period of the oscillator. The period of the oscillator is then related to the average signal propagation delay through the test circuit. The invention can be applied to synchronous components that might fail to oscillate by connecting the asynchronous set or clear terminal to the output terminal so that the oscillator oscillates at a frequency determined by the clock-to-out delay of those components. The configuration can thus be used to characterize synchronous and asynchronous components to provide data for predicting the timing behavior of circuits that include those or similar components.
摘要翻译： 电路通过选定的测试电路测量信号传播延迟。 测试电路设置有反馈路径，使得测试电路和反馈路径一起形成自由振荡的振荡器。 然后振荡器自动提供自己的测试信号，包括在测试电路输入节点上交替的上升和下降信号转换。 这些信号转换在预定的时间周期内进行计数，以建立振荡器的周期。 然后振荡器的周期与通过测试电路的平均信号传播延迟相关。 本发明可以应用于通过将异步设置或清除端子连接到输出端子而可能无法振荡的同步部件，使得振荡器以由那些部件的时钟到输出延迟确定的频率振荡。 因此，该配置可以用于表征同步和异步组件，以提供用于预测包括那些或类似组件的电路的定时行为的数据。
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公开(公告)号：US06233205B1
公开(公告)日：2001-05-15
申请号：US09115204
申请日：1998-07-14
IPC分类号： G04F800
CPC分类号： G01R31/3016 , G01R27/04 , G01R31/2853 , G01R31/2882 , G01R31/31725 , G01R31/318516 , G01R31/31937
摘要： A circuit measures the signal propagation delay through a selected test circuit. The test circuit is provided with a feedback path so that the test circuit and feedback path together form a free-running oscillator. The oscillator then automatically provides its own test signal that includes alternating rising and falling signal transitions on the test-circuit input node. These signal transitions are counted over a predetermined time period to establish the period of the oscillator. The period of the oscillator is then related to the average signal propagation delay through the test circuit. The invention can be applied to synchronous components that might fail to oscillate by connecting the asynchronous set or clear terminal to the output terminal so that the oscillator oscillates at a frequency determined by the clock-to-out delay of those components. The configuration can thus be used to characterize synchronous and asynchronous components to provide data for predicting the timing behavior of circuits that include those or similar components.
摘要翻译： 电路通过选定的测试电路测量信号传播延迟。 测试电路设置有反馈路径，使得测试电路和反馈路径一起形成自由振荡的振荡器。 然后振荡器自动提供自己的测试信号，包括在测试电路输入节点上交替的上升和下降信号转换。 这些信号转换在预定的时间周期内进行计数，以建立振荡器的周期。 然后振荡器的周期与通过测试电路的平均信号传播延迟相关。 本发明可以应用于通过将异步设置或清除端子连接到输出端子而可能无法振荡的同步部件，使得振荡器以由那些部件的时钟到输出延迟确定的频率振荡。 因此，该配置可以用于表征同步和异步组件，以提供用于预测包括那些或类似组件的电路的定时行为的数据。
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公开(公告)号：US06891395B2
公开(公告)日：2005-05-10
申请号：US10853981
申请日：2004-05-25
申请人： Robert W. Wells , Zhi-Min Ling , Robert D. Patrie , Vincent L. Tong , Jae Cho , Shahin Toutounchi
发明人： Robert W. Wells , Zhi-Min Ling , Robert D. Patrie , Vincent L. Tong , Jae Cho , Shahin Toutounchi
IPC分类号： G01R31/28 , G01R31/3185 , G06F17/50 , H01L21/82 , H03K19/173
CPC分类号： G01R31/318519 , G06F17/5054
摘要： Disclosed are methods for utilizing programmable logic devices that contain at least one localized defect. Such devices are tested to determine their suitability for implementing selected designs that may not require the resources impacted by the defect. If the FPGA is found to be unsuitable for one design, additional designs may be tested. The test methods in some embodiments employ test circuits derived from a user's design to verify PLD resources required for the design. The test circuits allow PLD vendors to verify the suitability of a PLD for a given user's design without requiring the PLD vendor to understand the user's design.
摘要翻译： 公开了利用包含至少一个局部缺陷的可编程逻辑器件的方法。 这些设备被测试以确定它们适用于实现可能不需要受缺陷影响的资源的选定设计。 如果发现FPGA不适合于一个设计，则可以测试其他设计。 在一些实施例中的测试方法使用从用户设计得出的测试电路来验证设计所需的PLD资源。 测试电路允许PLD供应商验证PLD对给定用户设计的适用性，而不需要PLD供应商了解用户的设计。
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10.发明授权公开(公告)号：US07219314B1
公开(公告)日：2007-05-15
申请号：US10815483
申请日：2004-04-01
IPC分类号： G06F17/50 , G06F11/07 , G01R31/3181 , G01R31/02
CPC分类号： G01R31/318516
摘要： Described are methods for implementing customer designs in programmable logic devices (PLDs). The defect tolerance of these methods makes them particularly useful with the adoption of “nanotechnology” and molecular-scale technology, or “molectronics.” Test methods identify alternative physical interconnect resources for each net required in the user design and, as need, reroute certain signal paths using the alternative resources. The test methods additionally limit testing to required resources so devices are not rejected as a result of testing performed on unused resources. The tests limit functional testing of used resources to those functions required in the user designs.
摘要翻译： 描述了在可编程逻辑器件（PLD）中实现客户设计的方法。 这些方法的缺陷容忍使得它们对采用“纳米技术”和分子规模技术或“molectronics”尤其有用。 测试方法识别用户设计中所需的每个网络的替代物理互连资源，并根据需要使用替代资源重新路由某些信号路径。 测试方法另外将测试限制为所需的资源，因为在未使用的资源上执行测试的结果，设备不会被拒绝。 测试将功能测试限制在用户设计中所需的功能。
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