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Flash memory medium scan method

A scanning method and scanning method technology, applied in the field of semiconductor storage media, can solve problems such as inability to meet the requirements at the same time, and achieve the effect of ensuring accuracy and improving scanning speed

Active Publication Date: 2013-05-01
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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  • Flash memory medium scan method

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Experimental program
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Effect test

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 scanning result to the host computer performing the scanning;

[0056] Step S304, receiving the write data command sent by the host, and writing the scanning data into the specified address according to the specified address in the command;

[0057] Step S305, respectively read the data in the specified address, compare the read data with the written positive scanning data, and consider the block with inconsistency between the written and read data as a bad block, otherwise it is considered as a good block, Generate scan results;

[0058] St...

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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, in particular to a method for scanning flash memory media. Background technique [0002] Flash media (Flash) includes multiple storage blocks (Block, the basic unit of erasing flash media), each block includes multiple pages (Page, the basic unit of reading and writing flash media), and each page includes multiple bits (bit, the value is 0 or 1). Bits that can realize 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. To identify whether flash media is usable, the blocks within it are scanned. An existing flash media scanning process is as follows: figure 1 As shown, the way to judge whether a certain block is a good block is to erase a certain block, then write data to this block, and then read data from each page, and compare it with the written data. When more than...

Claims

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Application Information

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