基于錯誤特征的NAND Flash存儲策略研究
[Abstract]:NAND Flash has been widely used in large capacity and high sampling rate test systems because of its excellent characteristics, such as non-easy to lose, fast reading and writing speed, large storage capacity, low power consumption and good seismic resistance. In order to further improve the storage capacity of NAND Flash and reduce its unit storage cost, the size of, NAND Flash chip continues to decrease with the increase of semiconductor production process. However, the gradual decrease of the voltage interval between the two adjacent threshold cells in NAND Flash storage cells leads to the increase of data error rate. Because the storage cell can only withstand a limited number of programming / erasure cycles, it leads to the limited service life of NAND Flash. Therefore, it is very meaningful to study the related NAND Flash storage management strategies to reduce its error rate and prolong its service life. Based on the error characteristics of NAND Flash, this paper optimizes the algorithm from programming data preprocessing and Flash conversion layer (Flash Translation Layer,FTL). The average error rate prediction model and the wear balance of page granularity are studied, and the management strategy of NAND Flash storage system is studied, and the related experiments are carried out on the hardware platform. The main research contents and achievements of this paper are as follows: 1. In order to reduce the main error rate of NAND Flash, this paper first studies the obvious data correlation between NAND Flash data residence and programming interference error, and then proposes a joint coding strategy based on data pattern difference. The core of this strategy is to improve the proportion of "1" in the data to be programmed through a kind of remapping coding, and to protect the data in the process of remapping coding and decoding by shortening the joint coding framework of BCH code. Because the joint coding strategy does not cause the change of the effective data width before and after coding and decoding, it will not occupy the additional user data area, so the strategy can realize the transparent adaptation with various FTL algorithms. The experimental results show that the joint coding strategy proposed in this paper can reduce the programming interference and data resident error of NAND Flash by about 90% and 98% respectively when the data throughput decreases slightly. In order to improve the service life of NAND Flash, this paper first studies the significant page difference of NAND Flash resident error, and then proposes a novel concern page tolerance difference (Page Endurance Variance Aware,. The FTL optimization strategy of PEVA). The PEVA strategy merges and optimizes the traditional FTL address mapping principle and the framework of bad block management, and converts the coarse-grain bad block management running in the underlying driver layer into the fine-granularity bad page management integrated into the FTL layer. In order to fully tap the useful life potential of each page in the NAND Flash data block. The experimental results show that compared with the traditional bad block management algorithm, PEVA strategy can prolong the life of NAND Flash by 9. 8 times without increasing the additional hardware load. In this paper, the error characteristics of NAND Flash with resident time and programming / erasure times are analyzed in detail, on the basis of which a prediction model of page original average bit error rate based on multinomial is summarized. Based on this model and the difference of page tolerance in NAND Flash, a fine granularity and realizable page wear equilibrium (Page-Granularity Wear-Leveling,) is proposed in this paper. PGWL) Strategy. PGWL strategy can judge the error rate level of data page according to the NAND Flash error rate prediction model, and use it as a measure to implement programming release operation in real time and dynamically. The experimental results show that compared with the traditional block wear equilibrium strategy, PGWL strategy can prolong the service life of NAND Flash by about 87.8%, and the data throughput load can be ignored.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:TP333
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