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US 8,982,681 B1Granted
Method and device for increased pull-in range of a timing recovery circuit for storage devices
AssigneeMarvell International Ltd.
InventorsJingfeng Liu, Mats Oberg
Life of this patent
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Abstract
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.
Claims18
A circuit for a storage device having a storage medium, the circuit comprising:
- a detector configured to detect a frequency offset based on a first distance between sync codes associated with the storage medium and generate an output, the detector further configured to generate an error signal based on a second distance, the second distance generated based on a frequency of the sync codes and to subtract the first distance from the second distance to generate a code distance difference and generate a normalized sync code distance difference;
- and
- a control circuit configured to adjust a frequency of a clock based on the output of the detector to synchronize the frequency with a signal read from the storage medium.
A method for a storage device having a storage medium, the method comprising:
- detecting a frequency offset by a detector based on a first distance between sync codes associated with the storage medium, wherein the detector generates an error signal based on a second distance, the second distance generated based on a frequency of the sync codes;
- subtracting the first distance from the second distance to generate a code distance difference;
- and
- generating a normalized sync code distance difference;
- and
- adjusting a frequency of a clock by a control circuit based on an output of the detector to synchronize the frequency with a signal read from the storage medium.
3 more elements
Dependencies are inferred from the claim text.