Timing recovery for data sampling of a detector

A disc drive, comprising:

• a read channel for reading data that is part of a data stream from a storage medium;
• and
• a detector for decoding the data, the detector comprising,
• a slicer for receiving a clock signal and the data, sampling the data, and generating a sequence of data samples;
• and
• a circuit coupled to the slicer and operable to determine whether the sequence is approved for use in correcting a phase error between the clock signal and the data and, if the circuit determines that the sequence is approved, to provide phase-correction information corresponding to the approved sequence for synchronization of the clock signal with the data.

A detector, comprising:

• a slicer operable to receive a clock signal and a data signal, to sample the data signal, and to generate a sequence of data samples;
• a sequence table operable to store predetermined information corresponding to the sequence of data samples and to provide the stored information in response to the sequence;
• a phase-error estimator operable to use the stored information to determine a phase error between the clock signal and a data sample from the sequence of data samples and to generate a phase-correction signal corresponding to the determined phase error;
• and
• comparison circuitry coupled to the slicer, the sequence table, and the phase-error estimator, the comparison circuitry operable to determine whether the sequence is valid and to provide the stored information to the phase-error estimator if the sequence is valid.

A detector for receiving data that is part of a data stream, the detector comprising:

• a slicer for receiving a clock signal and the data, sampling the data, and generating a sequence of data samples;
• a sequence table for storing respective predetermined values for possible sequences of data samples;
• and
• comparison circuitry coupled to the slicer and to the sequence table, the comparison circuitry operable to determine whether the sequence is valid and to provide a value stored in the sequence table for the sequence for synchronization of the clock signal with the data if the sequence is valid.

A disc drive, comprising:

• a read channel for reading data that is part of a data stream from a storage medium;
• and
• a detector for decoding the data, the detector comprising,
• a slicer operable to receive a clock signal and the data, to sample the data, and to generate a sequence of data samples,
• a sequence table operable to store predetermined information corresponding to the sequence of data samples and to provide the stored information in response to the sequence,
• a phase-error estimator operable to use the stored information to determine a phase error between the clock signal and a data sample from the sequence of data samples and to generate a phase-correction signal corresponding to the determined phase error, and
• comparison circuitry coupled to the slicer, the sequence table, and the phase-error estimator, the comparison circuitry operable to determine whether the sequence is valid and to provide the stored information to the phase-error estimator if the sequence is valid.