City Research Online

Modelling and characterization of NAND flash memory channels

Xu, Q., Gong, P., Chen, T., Michael, J. & Li, S. (2015). Modelling and characterization of NAND flash memory channels. Measurement, 70, pp. 225-231. doi: 10.1016/j.measurement.2015.04.003

Abstract

The threshold voltage distribution after ideal programming in NAND flash memory cells is usually distorted by a combination of the random telegraph noise (RTN), cell-to-cell interference (CCI), and the retention process. To decide the original bits more accurately in this scenario, a precise channel model shall be utilized on the basis of the measured threshold voltages. This paper aims to characterize these various distortions occurring in multi-level cell (MLC) flash memories. A mathematical description of the overall distribution for the total flash channel distortion is presented. The final threshold voltage distribution for each symbol of MLC flash is also characterized, which is important for calculating the exact soft decisions of cell bits and the application of advanced flash error correction. The results of the theoretical analysis have been validated through Monte Carlo simulations of the flash channel.

Publication Type: Article
Additional Information: © 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords: NAND flash; Error correction codes; Flash channel; Soft decisions
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Departments: School of Mathematics, Computer Science & Engineering > Engineering
School of Mathematics, Computer Science & Engineering > Engineering > Electrical & Electronic Engineering
URI: http://openaccess.city.ac.uk/id/eprint/14144
[img]
Preview
Text - Accepted Version
Available under License : See the attached licence file.

Download (701kB) | Preview
[img]
Preview
Text (Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence) - Other
Download (201kB) | Preview

Export

Downloads

Downloads per month over past year

View more statistics

Actions (login required)

Admin Login Admin Login