Coding method for skewed transition correction in parallel async

Details Coding method for skewed transition correction in parallel async Coding method for skewed transition correction in parallel async

1991-06-14

1994-01-18

Atkinson, Charles E.

Excavating

371 371, G06F 1110

Patent

active

052805336

ABSTRACT:
An algorithm for a (t.sub.1, t.sub.2)-tolerant code, and a method and apparatus for decoding same, for tolerating and detecting skewed transitions in a parallel asynchronous communication system without acknowledgement. Transitions sent at the same time in a parallel channel may arrive at different times, but the algorithm permits a limited degree of variation in transmission speeds between channels. Errors will be corrected and transmissions will be continuous as long as the values of t.sub.1 or t.sub.2 for the algorithm, as preselected by the user, are not exceeded. If they are exceeded, a desired control operation will generally be initiated. t.sub.1 is the maximum number of transmissions that may be missing from a first transmitted codeword when a transmission arrives from a second transmitted codeword, and t.sub.2 is the maximum number of transitions from the second codeword that may arrive before all transitions of the first codeword arrive.

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T. Verhoeff, Delay-Insensitive Codes-An Overview, Distributed Computing, vol. 3, pp. 1-8, 1988.
Blaum et al., On t-Error Correcting/All Unidirectional Error Detecting Codes, IEEE Transactions on Computers, vol., C38, pp. 1493-1501, Nov. 1989.
Berger, A Note on Error Detection Codes for Asymetric Channels, Information and Control, vol. 4, pp. 68-73, 1961.

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