BCH code error correction method capable of adaptive error correction

An error correction capability, BCH code technology, applied in the field of BCH code error correction, can solve the problems of reduced NAND flash memory life, reduced programming and erasing times, and reduced flash reliability. longevity and performance improvement

Inactive Publication Date: 2012-03-28
TSINGHUA UNIV
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Problems solved by technology

The continuous shrinking of the manufacturing process can produce higher-capacity flash memory products on the same silicon chip area, thereby reducing the cost per bit of storage. However, the continuous shrinking of the manufacturing process also seriously reduces the reliability of flash memory. The maximum number of programming and erasing (P/E cycles) allowed by flash memory (an important indicator to measure the reliability of flash memory) is gradually decreasing. The current new generation of flash memory products will use 25nm process technology, and each memory cell stores 2- bit information, but th

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  • BCH code error correction method capable of adaptive error correction
  • BCH code error correction method capable of adaptive error correction
  • BCH code error correction method capable of adaptive error correction

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] Such as image 3 , Figure 5 As shown, the BCH code error correction method with adaptive error correction capability comprises the following steps:

[0041] 1) When the NAND flash memory is first used, the number of page programming and erasing is small (less than or equal to a), and the bit error rate (BER) inside the flash memory is also small. At this time, the sector-level BCH code is selected (in sector (Sector) as the unit) as the error correction code of the NAND flash memory;

[0042] 2) With the continuous use of NAND flash memory, the number of page programming and erasing (P / E cycles) inside it continues to increase, and the bit error rate increases. When the number of page programming and erasing increases to a certain value (greater than a) When causing the number of bit errors to exceed the error correction capability of the original ...

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Abstract

The invention discloses a BCH code error correction method capable of adaptive error correction, which belongs to the field of data error correction in non-volatile memories. The method comprises the following steps: 1) when a page programming erasing number of a NAND flash memory is less than or equal to a, selecting a sector-level BCH code as an error correcting code; 2) when the page programming erasing number of the NAND flash memory is more than a and less than b, selecting a page-level BCH code as an error correcting code; 3) when the page programming erasing number of the NAND flash memory is more than or equal to b, marking the page as an invalid page. The beneficial effect of the invention is that: when a sector-level BCH code is adopted, the response speed of the flash memory to a host is increased; when a page-level BCH code is adopted, the error correction performance is improved, and thus the service life of the flash memory is increased.

Description

technical field [0001] The invention belongs to the field of data error correction in non-volatile memory, in particular to a BCH code error correction method with self-adaptive error correction capability. Background technique [0002] NAND flash memory is widely used in large-capacity data storage products (including MP3, tablet computer, mobile phone, etc.). The manufacturing process of NAND flash memory is continuously shrinking, and the process node of the new generation of NAND flash memory can reach 25nm. As a result, the maximum number of programming and erasing times allowed by the flash memory is also continuously reduced. During the use of flash memory, with the continuous increase of programming and erasing operations, its internal bit error rate (BER) also increases continuously, so NAND flash memory products need to use error correction code technology to improve its performance. reliability. [0003] Error correction code technology is a technology that can...

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Application Information

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IPC IPC(8): G11C29/42
Inventor 王雪强潘立阳周润德
Owner TSINGHUA UNIV
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