Excavating
Patent
1994-10-31
1998-07-21
Elmore, Reba I.
Excavating
H03M 1300
Patent
active
057843872
ABSTRACT:
The present invention is directed to a method for determining whether a current word in a stream of words having a plurality of frames is an idle word, an end-of-frame word, a start-of-frame word of one of the plurality of frames of words wherein an error can occur in the stream of words. The current word contains four bytes. One of the plurality of frames of words starts with a start-of-frame word and ends with an end-of-frame word. One of the plurality of frames of words is followed by a modified idle word. Between each of the plurality of frames of words there is at least one idle word. Each of the end-of-frame word, the start-of-frame word, the modified-idle word and the idle word has four bytes. The method contains the following steps: determining if the current word is an idle word. The current word is assumed to be an idle word if three of the four bytes of the current word match three of the four bytes of the idle word and if it is followed by the start-of-frame words. If the current word is not an idle word, determining if the current word is a start-of-frame words. If the current word is not an idle word, determining if the current word is a start-of-frame word. The current word is assumed to be a start-of-frame word if three of the four bytes of the current word match three of the bytes of the start-of-frame word and if a word preceding the current word is an idle word. If the current word is not a start-of-frame word, determining if the current word is an end-of-frame word. The current word is assumed to be an end-of-frame word if either all of the four bytes of the current word match the four bytes of the end-of-frame word and at least one byte of a next word following the current word match the four bytes of the modified-idle word, or if at least three of the four bytes of the current word match the four bytes of the end-of-frame word and at least two bytes of the next word matches two bytes of the modified idle word.
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Elmore Reba I.
International Business Machines - Corporation
Moise Emmanuel L.
Morris Daniel P.
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