Heterogeneous NAND type solid state disk and method for improving performance of heterogeneous NAND type solid state disk

Abstract

The invention provides a heterogeneous NAND type solid state disk and a method for improving the performance of the heterogeneous NAND type solid state disk. The heterogeneous NAND type solid state disk comprises an SLC (Single Layer Cell) NAND memory chip, further comprises an MLC (Multi Level Cell) NAND memory chip, and further comprises a 3D stack NAND memory chip, thereby being capable of integrating respective advantages and making up respective defects, and wider in application range. Meanwhile, the invention further provides a method for prolonging the endurance life of the heterogeneous NAND type solid state disk. The heterogeneous NAND type solid state disk is specifically adjusted according to service conditions of different parts in a memory, and a refresh cycle of a memory space in the memory can be periodically updated, thus erasing conditions of different regions in the memory can be more averagely distributed, further the service life of the memory is prolonged, and the storage capacity of a device to data is optimized.

Description

technical field [0001] The invention relates to the field of semiconductor devices, in particular to a heterogeneous NAND solid-state hard disk and a method for improving its endurance life and data retention capability. Background technique [0002] NAND solid-state drives have become the mainstream non-volatile storage technology and are widely used in various fields such as data centers, personal computers, mobile phones, smart terminals, and consumer electronics, and the demand is still growing. The manufacturing process of NAND solid-state drives has also been developed to 16nm, transforming from a two-dimensional manufacturing process to a three-dimensional manufacturing process. At present, the 128Gb 24-unit stacked three-dimensional NAND chip has been officially put into commercial production. The 16nm128Gb new two-dimensional NAND chip uses a new two-dimensional cell structure to break through the size reduction limit of the traditional two-dimensional structure. ...

AI Technical Summary

Problems solved by technology

[0006] At present, a single process method is adopted for NAND solid-state hard disk products. For example, a NAND solid-state hard disk uses all SLC NAND memory chips, or all uses MLC NAND storage memory chips, or all adopts more advanced 3D stacking technology. The finished memory NAND chip has larger capacity and lower cost, but the write endurance and data retention time of the storage unit will be significantly reduced

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