Excavating
Patent
1987-01-30
1989-03-14
Fleming, Michael R.
Excavating
371 49, 371 52, H03K 1332
Patent
active
048130443
ABSTRACT:
A method and apparatus used to detect errors in a signal transmitted over a single wire. All transient errors are detected when the effect of the transient lasts for at least one cycle and not more than five cycles. Transient errors of longer duration will be detected if the level of the original signal at the start of the transient is different from that at the end of the transient. Stuck faults will be deleted if one onset of the stuck fault causes the level of the signal to change. Redundancy is incorporated by introducing redundant transitions in the signal on the same wire. This requires the successive transitions in the original signal to be at least three cycles apart. If a transition is viewed as a binary one and the absence of a transition as a binary zero then each binary one is replaced with the sequence "one-one-one" (overwriting subsequent zeros), and keeping each zero as the single bit "zero". Upon decoding, each group of three transitions is converted to a single transition. Signals having more than or less than three consecutive transitions which are not in multiples of three are determined to be in error.
REFERENCES:
patent: 3576952 (1971-05-01), Van Dunren
patent: 4006455 (1977-02-01), Hamilton
patent: 4134103 (1979-01-01), Huxtable
patent: 4498177 (1985-02-01), Larson
patent: 4502143 (1985-02-01), Kato
patent: 4554665 (1985-11-01), Beesley
patent: 4581741 (1986-04-01), Huffman
Goyal Ambuj
Kumar Manoj
Rathi Bharat D.
Fleming Michael R.
Ilardi Terry J.
International Business Machines - Corporation
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