Finding faults in circuit boards

Details Finding faults in circuit boards Finding faults in circuit boards

1990-05-11

1991-02-19

Fleming, Michael R.

Excavating

371 163, 371 66, 371 18, G06F 1100

Patent

active

049950380

ABSTRACT:
The subject invention features diagnostic circuitry installed on one or more chips of a board. This diagnostic circuitry is constructed so that during a diagnostic interval it generates a diagnostic output signal if and only if it is supplied with normal voltages on service supply structures (such as ground, B+ supply, clock) distributing service voltages to devices on the board. The diagnostic output is connected to a diagnostic output pin of the chip which may also serve as one of the operating pins of the chip (such as a signal input pin). The receptacle for the diagnostic pin is connected on the board to a diagnostic interface at the periphery of the board.

REFERENCES:
patent: 3749897 (1973-07-01), Hirvela
patent: 4586179 (1986-04-01), Sirazi
patent: 4729124 (1988-03-01), Hansel
patent: 4782468 (1988-11-01), Jones
patent: 4812677 (1989-03-01), Perry
patent: 4819237 (1989-04-01), Hamilton
patent: 4837764 (1989-06-01), Russel
User's Manual of HMCS 400 Series produced by Hitachi Co., p. 4.

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