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    • 8. 发明授权
    • Fault diagnosis apparatus and recording medium with a fault diagnosis program recorded thereon
    • 故障诊断装置和记录有故障诊断程序的记录介质
    • US06308293B1
    • 2001-10-23
    • US09161522
    • 1998-09-29
    • Takeshi Shimono
    • Takeshi Shimono
    • G01R3128
    • G01R31/318342
    • The invention provides a fault diagnosis apparatus which estimates a disconnection fault site intermediate of a branch wiring line in an LSI based on a result of an LSI test performed by using a test pattern. An indefinite value simulation narrowing down section uses a test pattern to perform, for each gate included in a suspected fault gate set, a simulation wherein the output value of the gate is set to an indefinite value, and removes any gate from which a definite value is outputted among those outputs which have been determined to be errors with error test patterns. An output value check narrowing down section removes any gate from the suspected fault gate set if the gate satisfies a condition that the output value thereof at least in one error test pattern is different from that in the other error test patterns. Finally, a branch destination fault simulation narrowing down section defines 0/1 stuck-at faults to output branch designations of each gate included in the suspected fault gate set and performs a logic simulation using the test pattern. Then, the branch destination fault simulation narrowing down section removes any gate from the suspected fault gate set if the gate does not have an output branch destination fault which is not detected at a normal output but is detected at an error output.
    • 本发明提供一种基于通过使用测试图案进行的LSI测试的结果来估计LSI中的分支布线的中断断层故障现场的故障诊断装置。 不确定性值模拟缩小部分使用测试模式对包含在可疑故障门组中的每个门执行模拟,其中门的输出值被设置为不确定的值,并且去除了具有确定值的任何门 在已经被确定为具有错误测试图案的错误的那些输出之间输出。 如果门满足至少在一个错误测试模式中的输出值与其他错误测试模式中的输出值不同的条件,则输出值检查变窄部分从怀疑故障门组中移除任何门。 最后,分支目的地故障模拟缩小部分定义了0/1个故障,输出可疑故障门组中包含的每个门的分支指定,并使用测试模式进行逻辑仿真。 然后,如果门没有在正常输出端检测到但在错误输出端检测到的输出分支目的地故障,则分支目的地故障模拟缩小部分从疑似故障门组中移除任何门。