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Electronic data flash memory card with flash memory bad block management

A technology of electronic data and flash memory card, which is applied in the direction of electronic digital data processing, information storage, static memory, etc.

Inactive Publication Date: 2009-04-01
SUPER TALENT ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system and method must address the processing time required to process bad blocks, garbage collection, and search for available good blocks during wear leveling

Method used

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  • Electronic data flash memory card with flash memory bad block management
  • Electronic data flash memory card with flash memory bad block management
  • Electronic data flash memory card with flash memory bad block management

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] See figure 1 According to the embodiment of the present invention, the electronic data flash memory card 10 can be accessed by an external computer (host) 9 through the interface bus 13, the card reader 12 or other interface mechanisms (not shown). The electronic data flash memory card 10 includes a card body 1. Processing unit 2. One or more flash memory devices 3, fingerprint sensor 4, input / output interface circuit 5, optional display unit 6, optional power supply (for example, battery) 7, optional function keys 8.

[0042] The flash memory device 3 is installed on the card body 1 and stores one or more data files, a reference password, and reference fingerprint data obtained by scanning one or more authorized user fingerprints of the electronic data flash memory card 10 in a known manner. Only authorized users can access the stored data files. The data file can be a picture file or a text file.

[0043] The fingerprint sensor 4 is installed on the card body 1 and gener...

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PUM

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Abstract

An electronic data flash card accessible by a host computer, includes a flash memory controller connected to a flash memory device, and an input-output interface circuit activated to establish a communication with the host. In an embodiment, the flash card uses a USB interface circuit for communication with the host. A flash memory controller includes an arbitrator for mapping logical addresses with physical block addresses, and for performing block management operations including: storing reassigned data to available blocks, relocating valid data in obsolete blocks to said available blocks and reassigning logical block addresses to physical block addresses of said available blocks, finding bad blocks of the flash memory device and replacing with reserve blocks, erasing obsolete blocks for recycling after relocating valid data to available blocks, and erase count wear leveling of blocks, etc. Furthermore, each flash memory device includes an internal buffer for accelerating the block management operations.

Description

Technical field [0001] The invention relates to an electronic data flash memory card, and more specifically, to a system and method for controlling the flash memory block of a flash memory device in the electronic data flash memory card. Background technique [0002] Confidential data files are usually stored on floppy disks or transmitted through a network that requires passwords or security encryption. Confidential documents are sent via a secure seal. However, passwords, encryption, and security seals may all be destroyed (decrypted), which brings danger to confidential data files and confidential documents, and leads to unauthorized access to confidential information. [0003] As flash memory technology becomes more and more advanced, flash memory is gradually replacing the traditional magnetic disk as a storage medium in mobile systems. Compared with floppy disks or magnetic media hard drives, flash memory has the following significant advantages: high impedance and low powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C7/10G11C29/24G11C29/44G11C16/06
CPCG06F2212/7211G06F2212/1036G06F12/0246G06F2212/7203
Inventor 马治刚周圭璋李中和俞一康李威若沈明祥
Owner SUPER TALENT ELECTRONICS
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