Method and apparatus for detecting oscillator stuck faults in a level sensitive scan design (LSSD) system.

摘要

A method and apparatus for identifying stuck faults in an oscillator used for providing a oscillator input signal (12) to an integrated circuit chip of the type conforming to a Level Sensitive Scan Design (LSSD) system and testing technique. A pair of shift register latches (SRLs) (20,30) are provided in the integrated circuit chip having a logical one signal applied to a data input of the SRLs. The oscillator input signal is applied to a data clock input of a first one (20) of the SRLs and an inverted oscillator input signal is applied to the data clock input of a second one (30) of the SRLs. Then the scan data output (SDO) of the test SRLs is detected responsive to the applied oscillator and inverted oscillator input signals to identify a stuck fault.