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51. 发明授权

US07243279B2 Method for separating shift and scan paths on scan-only, single port LSSD latches 失效
标题翻译：用于在仅扫描单端口LSSD锁存器上分离移位和扫描路径的方法
公开(公告)号：US07243279B2
公开(公告)日：2007-07-10
申请号：US10604908
申请日：2003-08-26
申请人： Darren L. Anand , John E. Barth, Jr. , Steven F. Oakland , Michael R. Ouellette
发明人： Darren L. Anand , John E. Barth, Jr. , Steven F. Oakland , Michael R. Ouellette
IPC分类号： G01R31/28
CPC分类号： G01R31/318536 , G01R31/318544
摘要： A method and circuit design for enabling both shift path and scan path functionality with a single port LSSD latch designed for scan path functionality only, without increasing the device's internal real estate and without substantial increase in overall device real estate. The circuit design eliminates the need for additional logic components to be built into the internal circuitry of the device and also eliminates the cost of providing dual port LSSD latches within the device. Implementation of the invention involves providing a unique configuration of low level logic components as input circuitry that is coupled to a pair of single port LSSD latches that operate as the input latches for the device. The low level logic components accomplishes the splitting of scan chain inputs and shift chain inputs to the input latches and thus enables the single ported LSSD latches to operate with similar functionality as dual ported LSSD latches.
摘要翻译：一种方法和电路设计，用于仅使用设计用于扫描路径功能的单端口LSSD锁存器实现移位路径和扫描路径功能，而不会增加设备的内部房地产，而且整体设备的不动产不会大幅增加。电路设计消除了对设备内部电路内置的其他逻辑元件的需求，并且消除了在器件内提供双端口LSSD锁存器的成本。本发明的实现涉及提供作为输入电路的低级逻辑组件的独特配置，该输入电路耦合到作为设备的输入锁存器操作的一对单端口LSSD锁存器。低电平逻辑组件完成扫描链输入和移位链输入到输入锁存器的分割，从而使单端口LSSD锁存器能够与双端口LSSD锁存器类似的功能运行。

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