R&D: Reduce Refresh Operations on 3D TLC NAND Flash System via Wordline Interference
Evaluation results show that refresh operations are reduced by 40.7% at most; compared with previous work, RW response time are decreased by 31.2% and 43.5% respectively with 7-day refresh period.
This is a Press Release edited by StorageNewsletter.com on September 2, 2022 at 2:00 pmIEEE Embedded Systems Letters has published an article written by Liu Yang, Institute of Microelectronics of Chinese Academy of Sciences, 100029, Beijing, China, and also with the University of Chinese Academy of Science, Institute of Microelectronics of Chinese Academy of Sciences, 100049, Beijing, China, Qi Wang, Institute of Microelectronics of Chinese Academy of Sciences, 100029, Beijing, China, and with the University of Chinese Academy of Science, Institute of Microelectronics of Chinese Academy of Sciences, 100049, Beijing, China and alo with the Yangtze Memory Technologies Co. Ltd, 430205, Technology Center, WuHan, China, Qianhui Li, Xiaolei Yu, Institute of Microelectronics of Chinese Academy of Sciences, 100029, Beijing, China, and also with the University of Chinese Academy of Science, Institute of Microelectronics of Chinese Academy of Sciences, 100049, Beijing, China, and Zongliang Huo, Institute of Microelectronics of Chinese Academy of Sciences, 100029, Beijing, China, and with the University of Chinese Academy of Science, Institute of Microelectronics of Chinese Academy of Sciences, 100049, Beijing, China and alo with the Yangtze Memory Technologies Co. Ltd, 430205, Technology Center, WuHan, China.
Abstract: “As the storage density of 3D NAND flash memory increases, reliability issues become a bottleneck. Among all reliability issues, decreased retention time is the dominant one. To extend the retention time, data refresh is a straightforward approach. However, refresh operations introduce redundant operations, which hurt the performance of the 3D NAND flash system. With the observation that retention time can be extended by WL interference, this paper first proposes to extend retention time with WL interference practically, and then presents a refresh scheme, which refreshes only one-third of pages in a block and postpones the refresh on the remaining two-thirds of pages with WL interference. The evaluation results show that the refresh operations are reduced by 40.7% at most. Compared with previous work, the read and write response time are decreased by 31.2% and 43.5% respectively with 7-day refresh period.“
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