Silicon Motion, Inc.

Duen-Yih Teng

A method for performing data access control for a host device includes: receiving a plurality of host commands from the host device, for performing data access on at least one medium according to the plurality of host commands, wherein the data access includes data receiving; and performing a data access optimization procedure for maintaining correctness of the data receiving that includes: performing the data receiving on the at least one medium to obtain at least one code word; performing multiple first low-density parity-check (LDPC) code decoding operations regarding multiple column segments, where a portion of column segments are abnormal column segments corresponding to puncture variable nodes; finding at least one column segment satisfying predetermined selection condition, to perform at least one second LDPC code decoding operation regarding the at least one column segment; performing multiple third LDPC code decoding operations regarding the multiple column segments; and returning error-free data.

Method and apparatus for performing data access control for host device

The invention relates to a method, a non-transitory computer-readable storage medium and an apparatus for decoding a Low-Density Parity-Check (LDPC) code. The method, which is performed by a processing unit in an LDPC decoder, includes the following steps: determining whether a bit flipping algorithm when decoding a codeword enters a trapping state after an observation period during which a sequential selection strategy is used; and modifying a scheduling strategy to a non-sequential selection strategy and performing the bit flipping algorithm on the codeword under the non-sequential selection strategy when the bit flipping algorithm enters the trapping state. The codeword is divided into chunks in fixed-length and the sequential selection strategy indicates sequentially selecting the chunks in the codeword, so that the bit flipping algorithm is performed on one selected chunk only each time. The non-sequential selection strategy indicates an arbitrary selection combination of the chunks in the codeword, which is different from that under the sequential selection strategy.

Method and non-transitory computer-readable storage medium and apparatus for decoding low-density parity-check (LDPC) code

For an encoder for use in a flash memory controller, partial parity blocks generated in the encoder are divided into two parts for further operations, wherein a number of partial parity block(s) of the first part generated earlier is less than a number of partial parity block(s) of the second part. The encoder can reduce the hardware required for the circulant convolution calculation in the encoder, and has high efficiency. In addition, by converting a parity-check matrix to generate an isomorphic matrix, some components in the encoder and the decoder can be further omitted, so as to further reduce the manufacturing cost.

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Taoyuan, Taiwan

Duen-Yih Teng