Error analyzer for data communicated by bus protocol

Details Error analyzer for data communicated by bus protocol Error analyzer for data communicated by bus protocol

1983-07-20

1985-10-01

Atkinson, Charles E.

Excavating

371 57, 375 55, H04L 120, G06F 1100

Patent

active

045450552

ABSTRACT:
In this system for detecting errors in data handled on a bus in a biphase format in accordance with a certain bus protocol, a pair of signals are established. The digitally measured time durations of these signals accurately represent the respective positive and negative excursion times of the bus data. Certain analyzers detect errors digitally in response to these measured time durations. Each analyzer means includes a half sync detection means for ascertaining that the time duration of each of these signals corresponds to the expected time duration of half of an initial sync signal transmitted in conformance with the bus protocol. A valid sync detector ascertains the consecutive occurrence of valid half sync signals from each analyzer, and provides a valid sync detected signal, and indicates sync type. Additional circuitry determines if following data bit transitions occur with the correct timings, and count the number of data bit timings which occur before detection of the next sync signal or detection of a line inactive condition. Various errors are detected in accordance with these measurements.

REFERENCES:
patent: 3156893 (1964-11-01), Harel
patent: 3938082 (1976-02-01), Schowe, Jr.
patent: 4086566 (1978-04-01), Lender
patent: 4276649 (1981-06-01), Groenendaal et al.
patent: 4475212 (1984-10-01), McLean et al.
L. Sanders for Data-Comm. Links, Manchester Chip Could Be Best, Electronic Design, vol. 30, No. 6, Aug. 5, 1982, pp. 201-212.

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