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Flash memory medium scan method

A scanning method and a scanning method technology, which are applied in the field of semiconductor storage media, can solve the problems that cannot be satisfied at the same time, and achieve the effect of ensuring accuracy and improving scanning speed

Active Publication Date: 2009-10-21
NETAK TECH KO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing flash media scanning algorithms cannot meet multiple scanning requirements at the same time

Method used

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no. 4 example

[0052] The present invention proposes a fourth embodiment. The scanning level in this embodiment includes the third level. Refer to Figure 4 , The scanning methods corresponding to the third level include:

[0053] Step S301, erasing all blocks of the flash memory medium;

[0054] Step S302, checking the flash memory medium, judging whether the data is erased correctly, and generating a scanning result;

[0055] Step S303, sending the scan result to the host performing the scan;

[0056] Step S304, receiving the data write instruction from the host, and writing the scanning data to the designated address according to the designated address in the instruction;

[0057] Step S305, read the data in the designated address respectively, compare the read data with the written forward scan data, and consider the block with inconsistency between the written and read data as a bad block, otherwise it is regarded as a good block. Generate scan results;

[0058] Step S306, sending the scan ...

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Abstract

The invention provides a flash memory scan method comprising the following steps; selecting a scan level and using a scan mode corresponding to the scan level to scan a flash memory medium according to the selected scan level to form at least one scan result; and integrating the scan results to obtain a final scan result. The flash memory scan method sets a plurality of scan levels, gives attention to both scanning speed and scanning comprehensiveness to a certain extent so as to select proper scan levels according to the characteristics and the scanning requirement of a flash memory medium tobe scanned and enhances the scanning speed under the precondition of ensuring accuracy.

Description

Technical field [0001] The invention relates to the field of semiconductor storage media, and in particular to a flash memory media scanning method. Background technique [0002] Flash media (Flash) includes multiple storage blocks referred to as block (Block, the basic unit for erasing flash media), each block includes multiple pages (Page, the basic unit for reading and writing flash media), and each page includes multiple bits (bit, the value is 0 or 1). Bits that can achieve the inverse conversion of values ​​from "0" to "1" and from "1" to "0" are called good bits, otherwise they are considered bad bits and cannot be used to store data. In order to identify whether the flash media can be used, it is necessary to scan its internal blocks. An existing flash media scanning process is as follows figure 1 As shown, the method of judging whether a block is good is to erase a block, then write data to the block, and then read the data from each page and compare it with the written...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C29/32
Inventor 卢赛文
Owner NETAK TECH KO LTD