Method and device for detecting a data pattern in data bits

摘要

A method and device for determining frequency error to extend the pull-in range of a timing recovery circuit for a storage device such as an optical disc drive. A code associated with a storage format of the storage device is detected, and the distance between occurrences of the code is determined. The calculated distance is compared with the expected distance to determine the difference. Based on the difference, the frequency error is determined.

主权项

1. A method for detecting a data pattern in data bits, comprising:
receiving a plurality of constant bit groups, each constant bit group comprising a plurality of consecutive data bits of a same logic value; detecting a data pattern among the constant bit groups, including:
determining a constant bit length value that is representative of a length of a constant bit group; andoutputting a data pattern detection signal when the constant bit length value is larger than a detection threshold value; and setting the detection threshold value, including:
comparing constant bit length values from among the plurality of constant bit groups to a largest previous constant bit length value to determine a largest constant bit length value; anddetermining the detection threshold value based on the largest constant bit length value.