MRAM-using solid state hard disk and physical address-using reading/writing method

Abstract

The invention provides a solid state hard disk. The solid state hard disk comprises a main control chip, a group of NAND chips and an MRAM, wherein the NAND chips are used for storing data and are connected with the main control chip; the MRAM is connected with the main control chip; and the MRAM comprises a read / write cache. According to the solid state hard disk and a physical address-using reading / writing method provided by the invention, the MRAM comprises the read / write cache, so that the read / write performance can be ensured; a DDR DRAM is not used, and expensive and large-volume outage protection equipment is not needed, so that the cost and power consumption of the solid state hard disk are reduced; by using a host file system to process a logic address and physical address comparison list, the whole performance of the system is improved without loss; and the random read / write performance is not sacrificed and a lot of internal memory in the host is consumed, so that the scheme is more suitable for servers.

Description

technical field [0001] The invention relates to a solid-state hard disk, in particular to a solid-state hard disk using MRAM and a reading and writing method using physical addresses. 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. The interior consists of a set of NAND chips used to store data, DDR DRAM (memory) used to support calculations and cache data, and a main control chip (SSD Controller). Sometimes a power failure protection system is also required. [0003] NAND is a storage device that reads and writes as a whole. The smallest readable unit is called a page, and the smallest erasable unit is called a block. A block is often composed of many pages. After the block is erased, the pages inside can be written separately Enter operation. Write operations are...

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

[0014] However, DRAM consumes a lot of power and has additional costs. Therefore, in applications with strict power consumption requirements, for example, the above solutions cannot meet the application requirements.

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