Data reading method, storage controller and storage device

Abstract

The invention provides a data reading method, a storage controller and a storage device. The method comprises the steps of reading a target entity page by using a preset reading voltage correspondingto a reading operation to obtain a reading codeword syndrome of a reading codeword; reading the target entity page again by using a first adjustment reading voltage to obtain a first adjustment codeword syndrome of the first adjustment codeword; generating respective soft information of a plurality of target storage units of the target entity page according to the read codeword and a first adjustment codeword; identifying a target confidence table according to the size relative relationship among verifiers so as to search the confidence degrees of the plurality of target storage units from thetarget confidence table; and executing an adjusted preset decoding operation according to the plurality of pieces of soft information and the plurality of confidence degrees so as to obtain effectivecode words, thereby finishing the reading operation.

Description

technical field [0001] The invention relates to a data reading method, in particular to a data reading method suitable for a storage device configured with a rewritable non-volatile memory module and a storage controller thereof, and the storage controller. Background technique [0002] In general, when an iterative decoding operation (such as an LDPC decoding operation) performed on a codeword read from a physical side of a rewritable nonvolatile memory module fails, the memory controller of the memory device An attempt is made to correct the log-likelihood ratio table corresponding to the iterative decoding operation based on verification data (eg, known data pre-stored in the rewritable non-volatile memory module) to utilize the corrected log-likelihood ratio table. Then compare the table to re-execute the iterative decoding operation on the read codeword. [0003] However, since the traditional method needs to additionally prepare known verification data (that is, store...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned conventional method, if the read retry operation fails (that is, a valid codeword cannot be obtained through the decoding operation performed on the codeword read by the read voltage after the adjustment), the conventional method The originally obtained adjustment codeword will be discarded, and another read retry operation with different adjusted read voltages will be performed on the physical page again

That is to say, the traditional method will reduce the efficiency of data reading because of performing multiple read retry operations

In particular, the adjusted codewords obtained by the above-mentioned read retry operation will not be used to improve the decoding capability of the storage device, resulting in a waste of computing resources

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