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    • 3. 发明授权
    • Method and apparatus for preparing in-circuit test vectors
    • 用于制备在线测试矢量的方法和装置
    • US5596587A
    • 1997-01-21
    • US39947
    • 1993-03-29
    • Raymond W. DouglasPhilip J. StingerHarold W. NgTerence N. Lee
    • Raymond W. DouglasPhilip J. StingerHarold W. NgTerence N. Lee
    • G01R31/3183G01R31/319G06F11/16G01R31/28
    • G01R31/31915G01R31/318342
    • Method and apparatus for preparing sequences of test vectors to test for proper assembly of complex custom IC's onto printed circuit boards. The method, operating with appropriate apparatus for driving and sensing pins of a sample IC, automatically prepares an in-circuit test vector sequence, starting with only rudimentary information about the pins of the IC and no information at all about the functions or internal structure of the IC. The method makes use of goal-seeking and minimization procedures. The goal-seeking procedure constructs vector sequences from pseudorandom numbers until it finds a sequence which effectively and stably attains a set of pin fault coverage goals stated by the human operator. The minimization procedure then shortens the sequence, discarding excess vectors and keeping only those which efficiently contribute to the attainment of the pin fault coverage goal. The human operator may suggest sets of goals and starting sets of vectors, and may define clock events and data exchange cycles of multiple vectors in order to give the process a head start. The vectors are translated into a form suitable for incorporation into the programs of popular in-circuit ATE.
    • 用于制备测试载体序列以测试复杂定制IC在印刷电路板上的正确装配的方法和装置。 该方法利用用于驱动和感测样本IC的引脚的适当装置进行操作,自动准备在线测试向量序列,从仅关于IC引脚的初步信息开始,并且根本没有关于功能或内部结构的信息 IC。 该方法利用目标寻求和最小化程序。 目标寻求过程从伪随机数建立向量序列,直到找到有效和稳定地达到由人类操作人员指定的一组引脚故障覆盖目标的序列。 最小化程序缩短了序列,丢弃了多余的向量,并且只保留了有效地实现引脚故障覆盖目标的那些。 人类操作者可以提出一组目标和开始的向量集合,并且可以定义多个向量的时钟事件和数据交换周期,以便给出该进程的开始。 矢量被转换为适合并入流行的在线ATE程序中的形式。