Interface checking apparatus

Details Interface checking apparatus Interface checking apparatus

1983-06-29

1985-12-24

Atkinson, Charles E.

Excavating

371 71, G06F 1100

Patent

active

045610940

ABSTRACT:
Interface lines interconnect a first circuit to a second circuit. When an abnormal circuit condition affects the interface lines, such as an open circuit or a short circuit condition, the operation of the first and second circuit is detrimentally affected. This invention determines the existence of abnormal circuit conditions in one or more lines of a group of interface lines without using redundant duplex lines. The interface lines are subdivided into a first group, which are used when the apparatus of the present invention is being used to locate abnormal circuit conditions, and a second group, which are not used when the apparatus of the present invention is being used to locate abnormal circuit conditions. Each line of the first group is connected, at its input side, to a corresponding input terminal of a first exclusive-or gate and, at its output side, to a corresponding input terminal of a second exclusive-or gate. The first and second exclusive-or gates are input to a matching circuit, an output signal from the matching circuit indicating the existence of an abnormal circuit condition in the first group of lines. One line of the first group is connected to an input side of the second group. The output side of the second group is connected to an additional input terminal of the second exclusive-or gate. An output signal from the matching circuit indicates the existence of an abnormal circuit condition in at least one line of either one or both of the first and second group of lines.

REFERENCES:
patent: 3492641 (1970-01-01), Harmon
patent: 3500318 (1970-03-01), Arlen
patent: 4003020 (1977-01-01), Clarke
patent: 4257031 (1981-03-01), Kirner et al.
patent: 4298982 (1981-11-01), Auerbach
Checking Single Bit Changes, H. Baeumer, D. Bazlen, K. J. Getzlaff, J. Hajdu & S. Richter, Technical Disclosure Bulletin, vol. 21, No. 11, Apr. 1979, p. 4572.

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