Abstract
After the development of TLC (Triple level cell) NAND, QLC (Quad level cell) technology will be one of the solutions for next generation NAND flash product. QLC (4 bits/cell) NAND's data levels are up to 16 levels which bring the narrower and tighter voltage ranges and worse performance. This paper studies QLC program and read mechanisms, and presents five types of program algorithms for writing data in QLC cells. Correspondingly, the enhanced Gray coding methods for data mapping based on these different program algorithms are researched. They will be beneficial to data reading. After simulating with changing cell voltages to generate the data errors in the QLC model, the paper presents four enhanced Gray codings to match 16 voltage levels for different program algorithms and read operations. This study will improve the efficiency and keep balance in system-level application for the data error correction of QLC 4 pages which are mapped in the same wordline (WL).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
