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1. 发明授权

US06993694B1 Deterministic bist architecture including MISR filter 有权
标题翻译：确定性bist架构，包括MISR过滤器
公开(公告)号：US06993694B1
公开(公告)日：2006-01-31
申请号：US10117747
申请日：2002-04-05
申请人： Rohit Kapur , Thomas W. Williams , Tony Taylor , Peter Wohl , John A. Waicukauski
发明人： Rohit Kapur , Thomas W. Williams , Tony Taylor , Peter Wohl , John A. Waicukauski
IPC分类号： G01R31/28 , G01R31/08
CPC分类号： G01R31/318547 , G01R31/318558
摘要： A filter for preventing uncertain bits output by test scan chains from being provided to a MISR is provided. The filter can include a gating structure for receiving a bit from a scan chain and control circuitry for providing a predetermined signal to the gating structure if the bit is an uncertain bit. In one embodiment, the gating structure can include a logic gate, such as an AND or an OR gate. The control circuitry can include components substantially similar to the pattern generator providing signals to the scan chain. For example, the control circuitry can include an LFSR and a PRPG shadow for loading the LFSR. In one embodiment, the control circuitry can further include a phase-shifter for receiving inputs from the LFSR and providing outputs to the gating structure.
摘要翻译：提供了一种用于防止测试扫描链输出的不确定位提供给MISR的滤波器。滤波器可以包括用于从扫描链接收比特的选通结构和用于如果该比特是不确定比特，则向选通结构提供预定信号的控制电路。在一个实施例中，门控结构可以包括逻辑门，诸如AND或OR门。控制电路可以包括与向扫描链提供信号的图案发生器基本相似的组件。例如，控制电路可以包括用于加载LFSR的LFSR和PRPG阴影。在一个实施例中，控制电路还可以包括用于接收来自LFSR的输入并向门控结构提供输出的移相器。

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