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Method and device for writing data by NAND FLASH

A technology for writing data and data, applied in the direction of memory address/allocation/relocation, etc., can solve problems such as writing or erasing operation errors, inability to erase and write infinitely, and limited life of NANDFLASH memory

Active Publication Date: 2015-07-15
HEFEI GEYI INTEGRATED CIRCUIT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When writing or erasing bad blocks, it will cause errors in writing or erasing operations
In the application, the block skipping strategy is generally used to manage bad blocks, but it cannot solve the bad blocks generated during system operation
At the same time, the life of NAND FLASH memory is limited and cannot be erased and written indefinitely

Method used

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  • Method and device for writing data by NAND FLASH
  • Method and device for writing data by NAND FLASH
  • Method and device for writing data by NAND FLASH

Examples

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Embodiment Construction

[0081] In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0082] One of the core ideas of the embodiment of the present application is that during the write operation, the mapping of the logical address is converted to a physical block with the least number of erasures, so that the write operation is performed on a physical block with the least number of erasures of. At the same time, if it is found that the block to be written is a bad block, this block is added to the bad block space, and the block with the least number of erasures is found from the free list again to perform the write operation.

[0083] NAND FLASH is a kind of non-volatile flash memory. NAND FLASH is divided into several zones (regions), each zone is divided into several blocks (blocks), ea...

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Abstract

The invention discloses a method for writing data by an NAND FLASH. The NAND FLASH comprises physical blocks; physical blocks are mapped to logic blocks one to one; each logic block comprises a mapping table and a free chain table; the method comprises the following steps of determining a to-be-written first logic block; acquiring the physical blocks of which the erase times are fewest from the free chain tables to serve as first physical blocks; judging whether the first physical blocks are bad blocks or not, and if the first physical blocks are the bad blocks, marking the current first physical blocks as the bad blocks, and replacing the first physical block; writing to-be-written data in the first physical blocks; recording mapping to the first physical blocks from first logic blocks in the mapping tables. According to the method disclosed by the invention, by utilizing the free chain tables, wear leveling is realized; the bad blocks discovered in write operation are mapped to a bad block space, and the physical blocks of which the erase times are fewest are reacquired from the free chain tables to perform the write operation so as to combine bad block management with the wear leveling.

Description

technical field [0001] The present application relates to the technical field of data storage, in particular to a method for writing data in NAND FLASH and a device for writing data in NAND FLASH. Background technique [0002] NAND FLASH is a non-volatile flash memory that can provide high capacity within a given chip size. It uses pages as the basic unit for storage and block as the basic unit for erasing. It has a very fast writing and erasing speed and is a better storage device than hard disk drives. [0003] While having many advantages, NAND FLASH may produce bad blocks during production and use due to problems in the production process, which will make the system unstable. When writing or erasing bad blocks, it will cause errors in writing or erasing operations. In applications, the block skipping strategy is generally used to manage bad blocks, but it cannot solve the bad blocks generated during system operation. At the same time, the life of NAND FLASH memory is ...

Claims

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Application Information

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IPC IPC(8): G06F12/06
Inventor 汤秋莲马斌王景华
Owner HEFEI GEYI INTEGRATED CIRCUIT CO LTD
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