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A data encoding method and a data storage method of an SCM

A data encoding and data storage technology, applied in information storage, static memory, memory system, etc., can solve the problem that the advantage of low wear is not fully utilized

Active Publication Date: 2019-01-11
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, if one bit of data is stored less, at most only one storage unit can be applied with low energy. Therefore, the advantage of low wear brought by applying low energy has not been fully utilized.

Method used

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  • A data encoding method and a data storage method of an SCM
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Embodiment Construction

[0066] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0067] Before describing the technical solutions of the present invention in detail, the terms used in the present invention are explained as follows:

[0068] Storage unit: The basic unit circuit of SCM uses different energies to represent different data, and each storage unit can store k bits;

[0069] Word line: composed of many memory cells arranged to connect the control terminals of the memor...

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Abstract

The invention discloses a data coding method and a data storage method of an SCM. The encoding method utilizes a memory cell group consisting of m memory cells to store n bits and guarantees 2n m bitsfor storing n bits. The wear value of each memory cell in the memory cell group caused by any m-cell energy combination averagely does not exceed the wear value threshold. The data storage method comprises the following steps: dividing the user data area in the SCM and the metadata area divided from the OOB area into a plurality of intervals, and dividing each interval into segments; and adoptingthe data coding method provided by the invention for each memory unit group in each interval; determining the number of slices contained in each interval by calculation, so that the wear value of each memory cell caused by single erase averaging in user data area and metadata area is the lowest. The invention uses the energy combination with the lowest wear to the memory cell to represent the data bits, reduces the wear to the SCM, thereby prolonging the life of the SCM.

Description

technical field [0001] The invention belongs to the field of computer storage, and more particularly, relates to a data encoding method and a data storage method of an SCM. Background technique [0002] Storage-class memory (denoted as SCM), also known as persistent memory, such as NAND Flash, PCRAM, RRAM, etc., due to its excellent read and write performance and relatively low cost, SCM is the most important storage solution. has been widely used. SCM realizes data storage by changing the state of the storage medium. When changing the state of the storage medium, a certain amount of erasing and writing energy is required. During this process, the storage medium will be subject to certain wear and tear, so the number of erasing / writing the storage medium can withstand is limited. That is, the life of the device is limited, for example, the number of erase / write times of NAND Flash is about 10 4 Second-rate. In storage systems, extending the life of the SCM is of great sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/02G11C16/34
CPCG06F12/0246G06F2212/7211G11C16/3495
Inventor 万胜刚叶婷何绪斌肖卫军谢长生
Owner HUAZHONG UNIV OF SCI & TECH
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