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AssigneeInternational Business Machines Corporation
InventorsRoy Daron Cideciyan, Jonathan Darrel Coker, Evangelos S. Eleftheriou, Richard Leo Galbraith, Todd Carter Truax
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A method and apparatus are provided for word synchronization with large coding distance and fault tolerance for a partial-response maximum-likelihood (PRML) data channel in a direct access storage device (DASD). A Viterbi detector receives equalized PR4 samples including a predefined word synchronization pattern. The Viterbi detector is a dedicated detector optimized for detecting the predefined word synchronization pattern. The Viterbi detector includes a two-state Viterbi trellis and a word synchronization detector for the two-state Viterbi trellis. The predefined word synchronization pattern includes only even length magnets. The predefined word synchronization pattern is a repetition code including pairs of ones and pairs of zeros and includes multiple pattern match sequences. The Viterbi detector is optimized with branches removed from the Viterbi trellis, thus increasing coding distance. The two-state Viterbi trellis and word synchronization detector of the Viterbi detector operate on a 2T basis, where 1/T is the sample rate.
Apparatus for word synchronization with large coding distance and fault tolerance for a partial-response maximum-likelihood (PRML) data channel in a direct access storage device (DASD) comprising:
Apparatus for word synchronization with large coding distance and fault tolerance as recited in claim 16 wherein said word sync pattern compare function identifies at least a predefined subset of said multiple pattern match sequences and generates a start of data trigger for the partial response maximum-likelihood (PRML) data channel.
A method for word synchronization with large coding distance and fault tolerance for a partial-response maximum-likelihood (PRML) data channel in a direct access storage device (DASD) comprising the steps of:
Dependencies are inferred from the claim text.