Apparatus and method for testing digital circuits

Details Apparatus and method for testing digital circuits Apparatus and method for testing digital circuits

G - Physics

06

F

354/227, 324/3

G06F 11/00 (2006.01) G06F 11/277 (2006.01)

Patent

CA 1037609

ABSTRACT A device is disclosed which converts a digital signal or bit stream into a digital signature representative of the digital signal by means of a feedback shift register. The apparatus may be used to identify and characterize digital signals at various test points in an apparatus for testing purposes. Signatures for digital signals from properly operating circuits can be re- corded in a variety of fashions for later comparison with signa- tures of digital signals from circuits under test. The compari- son of the signatures enables a person using the apparatus to determine whether the circuit under test is operating properly and, if it is not, to locate the fault in many instances. The apparatus may also be used to examine repetitive digital signals to enable identification of transient errors.

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