US 12,218,683 B1
Log likelihood ratios adjustment based on error tracker
Haobo Wang, Sunnyvale, CA (US); Qiuju Diao, Santa Clara, CA (US); and Fan Zhang, Fremont, CA (US)
Assigned to SK hynix Inc., Gyeonggi-do (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR)
Filed on Aug. 10, 2023, as Appl. No. 18/447,969.
Int. Cl. H03M 13/11 (2006.01); G06F 11/10 (2006.01)
CPC H03M 13/1125 (2013.01) [G06F 11/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
performing assist reads (AR) of multibit memory cells of a memory to determine an AR zone for each bit of data stored in the multibit memory cells;
performing soft reads of the multibit memory cells to determine a bin within the AR zone for each bit of the data stored in the multibit memory cells, wherein each bin is associated with a log likelihood ratio (LLR) value;
performing error correction decoding on the data stored in the multibit memory cells;
collecting statistics on the decoded data for each bin in each AR zone;
computing a hard error percentage for each AR zone based on the collected 10 statistics; and
adjusting one or more LLR values based on the hard error percentage.