Memory system to process multiple word line failures with limited storage and method of operating such memory system
AssigneeSK hynix memory solutions America Inc.
InventorsNaveen KUMAR, Yu CAI, Fan ZHANG
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Abstract
Systems, memory controllers, decoders and methods perform decoding by exploiting differences among word lines for which soft decoding fails (failed word lines). Such decoding generates extrinsic information for codewords of failed word lines based on the soft decoding. The soft information obtained during the soft decoding is updated based on the extrinsic information, and the updated soft information is propagated across failed word lines. Low-density parity-check (LDDC) decoding of codewords of failed word lines is performed with the updated soft information.
Claims20
A memory system, comprising:
- a memory device including a super block;
- and
- a memory controller configured to:
- perform soft decoding of all word lines in the super block to generate respective codewords;
- generate extrinsic information for codewords of word lines for which soft decoding failed (failed word lines) based on the soft decoding;
- update soft information obtained during the soft decoding based on the extrinsic information;
- propagate the updated soft information across at least some of the failed word lines;
- and
- perform low-density parity-check (LDPC) decoding of codewords of failed word lines with the updated soft information.
A memory controller comprising:
- a low-density parity-check (LDPC) decoder configured to:
- perform soft decoding of all word lines in a super block to generate respective codewords;
- generate extrinsic information for codewords of word lines for which soft decoding failed (failed word lines) based on the soft decoding;
- update soft information obtained during the soft decoding based on the extrinsic information;
- propagate the updated soft information across at least some of the failed word lines;
- and
- perform low-density parity-check (LDPC) decoding of codewords of failed word lines with the updated soft information.
A method of decoding, comprising:
- performing soft decoding of all word lines in a super block of a memory device to generate respective codewords;
- generating extrinsic information for codewords of word lines for which soft decoding failed (failed word lines) based on the soft decoding;
- updating soft information obtained during the soft decoding based on the extrinsic information;
- propagating the updated soft information across at least some of the failed word lines;
- and
- performing low-density parity-check (LDPC) decoding of codewords of failed word lines with the updated soft information.
Dependencies are inferred from the claim text.