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1. 发明授权

US07145977B2 Diagnostic method and apparatus for non-destructively observing latch data 失效
标题翻译：用于非破坏性观察锁存数据的诊断方法和装置
公开(公告)号：US07145977B2
公开(公告)日：2006-12-05
申请号：US10604550
申请日：2003-07-30
申请人： Darren L Anand , John R Goss , Peter O Jakobsen , Michael R Ouellette , Thomas G Sopchak , Donald L Wheater
发明人： Darren L Anand , John R Goss , Peter O Jakobsen , Michael R Ouellette , Thomas G Sopchak , Donald L Wheater
IPC分类号： G11C19/00
CPC分类号： G11C19/00 , G11C29/003
摘要： The invention provides a circuit that can observe data within shift registers without altering the data. The circuit includes selectors connected to the inputs and outputs of the shift registers. The selectors selectively connect the input with the output of a selected shift register to form a wiring loop for the selected shift register. A control device connected to the wiring loop uses the wiring loop to cause the data to be continually transferred from the output of the selected shift register to the input of the selected shift register and back through the selected shift register in a circular manner. The control device includes a counter used for determining the length of a selected shift register and a set of registers to store, for future use when rotating data in the shift registers, the length of each shift register. The control device also includes a data output accessible from outside the circuit. An observation wire is connected to the wiring loop, and the data passes from the wiring loop to the control device through the observation wire. The control device outputs data appearing on the wiring loop as the data is circulated through the selected shift register to permit data within the selected shift register to be observed outside the circuit without altering the data within the selected shift register.
摘要翻译：本发明提供一种可以观察移位寄存器内的数据而不改变数据的电路。该电路包括连接到移位寄存器的输入和输出的选择器。选择器选择性地将输入与所选移位寄存器的输出连接，以形成所选移位寄存器的布线回路。连接到布线回路的控制装置使用布线回路使得数据从所选择的移位寄存器的输出连续地传送到所选择的移位寄存器的输入端并循环地返回所选择的移位寄存器。控制装置包括用于确定所选择的移位寄存器的长度的计数器和一组寄存器，用于存储当在移位寄存器中旋转数据时将来使用的每个移位寄存器的长度。控制装置还包括从电路外部可访问的数据输出。观察线连接到布线回路，数据通过观察线从布线回路传递到控制装置。当数据通过选定的移位寄存器循环时，控制装置输出出现在布线环路上的数据，以允许在电路外观察所选移位寄存器内的数据，而不改变所选移位寄存器内的数据。

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