System and method for accumulating soft information in LDPC decoding

A nonvolatile memory controller for accumulating soft information of a nonvolatile memory storage module for use in LDPC (Low-Density Parity Check) decoding of a codeword stored in the nonvolatile memory storage module, the nonvolatile memory controller comprising:

• read circuitry configured for performing a plurality of reads of a cell of a nonvolatile memory storage module to generate a plurality of soft reads associated with a bit stored in the cell;
• accumulation circuitry coupled to the read circuitry, the accumulation circuitry configured for accumulating the plurality of soft reads to generate an accumulated soft read associated with the bit stored in the cell, wherein the accumulated soft read has a numerical value equal to the sum of the number of soft reads having a particular logical value;
• and
• look-up circuitry coupled to the accumulation circuitry, the look-up circuitry configured for converting the accumulated soft read into a log-likelihood ratio (LLR) for use in LDPC decoding of a codeword stored in the nonvolatile memory storage module.

A system for accumulating soft information for use in LDPC (Low-Density Parity Check) decoding, the system comprising:

• a nonvolatile memory storage module storing a codeword;
• read circuitry coupled to the nonvolatile memory storage module, the read circuitry configured for performing a plurality of reads of a cell of the nonvolatile memory storage module to generate a plurality of soft reads associated with a bit stored in the cell;
• accumulation circuitry coupled to the read circuitry, the accumulation circuitry configured for accumulating the plurality of soft reads to generate an accumulated soft read associated with the bit stored in the cell, wherein the accumulated soft read has a numerical value equal to the sum of the number of soft reads having a particular logical value;
• and
• look-up circuitry coupled to the accumulation circuitry, the look-up circuitry for converting the accumulated soft read into a log-likelihood ratio (LLR) for use in LDPC decoding of the codeword stored in the nonvolatile memory storage module.