Channel quality monitoring and method for qualifying a storage channel using an iterative decoder
AssigneeMarvell International Ltd.
InventorsNedeljko Varnica, Gregory Burd
Life of this patent
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Abstract
Monitors, architectures, systems and methods for determining one or more quality characteristics of a storage channel. The monitor generally includes an iterative decoder configured to decode data from the storage channel and generate information relating to a quality metric of the storage channel and/or the iterative decoder, a memory configured to store a threshold value for the quality metric, and a comparator configured to compare the threshold value with a measured value of the quality metric. The monitor enables accurate determination of storage channel quality without use of conventional Reed-Solomon metrics.
Claims20
A method of determining reliability of a data storage medium, the method comprising:
- determining, for the data storage medium, a threshold value relating to logarithmic likelihood ratios (LLRs);
- receiving data from the storage medium;
- iteratively decoding the data using LLRs associated with the data;
- determining a LLR-based parameter that is a function of the LLRs that are found to be associated with the data during the iterative decoding;
- and
- determining a quality of the storage medium based on a comparison of the determined LLR-based parameter to the threshold.
A system for determining reliability of a data storage medium, the system comprising:
- a memory configured to store, for the data storage medium, a threshold value relating to logarithmic likelihood ratios (LLRs);
- an iterative decoder configured to
- receive data from the storage medium,
- iteratively decode the data using LLRs associated with the data, and
- determine a LLR-based parameter that is a function of the LLRs that are found to be associated with the data during the iterative decoding;
- and
- a comparator logic configured to compare the determined LLR-based parameter to the threshold to determine a quality of the storage medium.
Dependencies are inferred from the claim text.