Storage device and read-write method applying block-based logic physical address comparison table

Abstract

The invention provides a storage device. The device comprises a host interface, a main control chip, one or more NAND chips for storing data and an MRAM; the MRAM comprises a write cache or a read-write cache; the MRAM also comprises a block-based logic physical address comparison table which is used for storing logic block numbers and corresponding physical block numbers. The invention also provides a read-write method applying the block-based logic physical address comparison table. According to the storage device and the read-write method applying the block-based logic physical address comparison table provided by the invention, the read-write performance can be ensured; the number of times of erasing an NAND can be reduced; the service life of the storage device can be prolonged; in adoption of the block-based logic physical address comparison table, a block is much larger than a page; a great deal of storage space can be saved; if the write channel of the NAND is blocked, corresponding NAND pages are written in replacement pages; a page replacement table is updated; and the write performance is further improved.

Description

technical field [0001] The invention relates to the field of data storage, in particular to a storage device and a reading and writing method using a logical-physical address comparison table based on blocks. Background technique [0002] Currently, the development of NAND flash memory technology has promoted the SSD industry. Such as figure 1 As shown, high-speed serial interfaces such as SATA, PICe and other technologies are used between the SSD and the host. Internally, it consists of a set of NAND chips for storing data, DDRDRAM (memory) for supporting calculation and caching data, and a main control chip (SSDController). NAND also stores a logical address and physical address comparison table. Sometimes a power failure protection system is also required. [0003] The architecture of various memory cards such as eMMC and SD is similar to that of SSD, the difference is that the protocol with the host interface is different, and DRAM is usually not used, but a small amo...

AI Technical Summary

Problems solved by technology

However, the introduction of the write cache creates a new problem: once a power failure occurs, the content in the DRAM cache that has not been written to the NAND will be lost, causing the system to lose data or even damage the entire file system

More NAND erasing times will shorten the life of NAND, causing solid-state drives or mobile phones to be scrapped in advance

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