公开(公告)号：US07428681B2

公开(公告)日：2008-09-23

申请号：US11159025

申请日：2005-06-22

Applicant: Sungho Kang ,  You-Bean Kim ,  Myung-Hoon Yang ,  Yong Lee

Inventor： Sungho Kang ,  You-Bean Kim ,  Myung-Hoon Yang ,  Yong Lee

IPC: G01R31/28 ,  G06F11/00

CPC classification number: G01R31/318536

Abstract: A method for reducing the number of transitions generated by an LFSR is introduced. The transition monitoring window monitors the number of transitions occurring as random patterns generated from an LFSR are applied to a scan chain, and, if the number of transitions exceeds a threshold value (“k-value”), all further transitions are suppressed. The transition monitoring window monitors the patterns entering the LFSR, incrementing a counter if a transition is detected. If a transition is detected just before the exit of a lowest stage of the LFSR the counter is decremented. The signal from the counter is compared with the k-value at every clock tick, and if the count is greater than the k-value, the vector most recently applied to the scan chain is re-applied to the scan chain; if it is less than the k-value, the output from the LFSR is applied to the scan chain.

Abstract translation: 引入了一种用于减少由LFSR产生的转换次数的方法。 转换监视窗口监视从LFSR生成的随机模式发生的转换次数应用于扫描链，并且如果转换次数超过阈值（“k值”），则所有进一步的转换被抑制。 转换监视窗口监视进入LFSR的模式，如果检测到转换，则增加一个计数器。 如果在LFSR的最低阶段退出之前检测到转移，计数器递减。 将计数器的信号与每个时钟周期的k值进行比较，如果计数大于k值，则最近应用于扫描链的矢量被重新应用于扫描链; 如果它小于k值，则将来自LFSR的输出应用于扫描链。

公开(公告)号：US20070011533A1

公开(公告)日：2007-01-11

申请号：US11159025

申请日：2005-06-22

Applicant: Sungho Kang ,  You-Bean Kim ,  Myung-Hoon Yang ,  Yong Lee

Inventor： Sungho Kang ,  You-Bean Kim ,  Myung-Hoon Yang ,  Yong Lee

IPC: G01R31/28

CPC classification number: G01R31/318536

Abstract: A method for reducing the number of transitions generated by an LFSR is introduced. The transition monitoring window monitors the number of transitions occurring as random patterns generated from an LFSR are applied to a scan chain, and, if the number of transitions exceeds a threshold value (“k-value”), all further transitions are suppressed. The transition monitoring window monitors the patterns entering the LFSR, incrementing a counter if a transition is detected. If a transition is detected just before the exit of a lowest stage of the LFSR the counter is decremented. The signal from the counter is compared with the k-value at every clock tick, and if the count is greater than the k-value, the vector most recently applied to the scan chain is re-applied to the scan chain; if it is less than the k-value, the output from the LFSR is applied to the scan chain.

Abstract translation: 引入了一种用于减少由LFSR产生的转换次数的方法。 转换监视窗口监视从LFSR生成的随机模式发生的转换次数应用于扫描链，并且如果转换次数超过阈值（“k值”），则所有进一步的转换被抑制。 转换监视窗口监视进入LFSR的模式，如果检测到转换，则增加一个计数器。 如果在LFSR的最低阶段退出之前检测到转移，计数器递减。 将计数器的信号与每个时钟周期的k值进行比较，如果计数大于k值，则最近应用于扫描链的矢量被重新应用于扫描链; 如果它小于k值，则将来自LFSR的输出应用于扫描链。