Diagnostic circuit for digital systems

Details Diagnostic circuit for digital systems Diagnostic circuit for digital systems

1982-09-21

1984-10-09

Atkinson, Charles E.

Excavating

G06F 1100

Patent

active

044765606

ABSTRACT:
An improved circuit for serial scan diagnosis is provided. A state register in the signal path of the digital system under diagnosis is coupled to a diagnostic shift register. Test data is introduced and removed through the diagnostic shift register through a serial input terminal and serial output terminal. For certain operations the serial input terminal becomes a control terminal whereby a minimum number of control lines is required.

REFERENCES:
patent: 3657699 (1972-04-01), Rocher et al.
patent: 3761695 (1973-09-01), Eichelberger
patent: 4042794 (1977-08-01), Lima et al.
patent: 4241307 (1980-12-01), Hong
patent: 4244048 (1981-01-01), Tsui
patent: 4317200 (1982-02-01), Wakatsuki et al.

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