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Embedded type file system suitable for smart card application environment

An embedded file, application environment technology, applied in memory systems, special data processing applications, instruments, etc., can solve the problems of data synchronization, unsuitable for reading, unable to adapt to the paging structure storage method and addressing, etc., to achieve safe and reliable. stored effect

Inactive Publication Date: 2009-05-27
RDA MICROELECTRONICS SHANGHAICO LTD
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AI Technical Summary

Problems solved by technology

[0005] At present, the main smart card data recording method is directly stored in the flash memory, and the data is mainly stored sequentially and continuously, which is not suitable for reading files other than the file format on the traditional smart card, such as media files, database files, etc.
Moreover, a COS file system generally can only be applied to a certain (or some) smart card, so it cannot be synchronized with the data on the PC or terminal through a general high-speed interface (such as USB, SD / MMC, etc.)
Due to the large-scale application of Flash storage media in embedded systems and people's demand for large-capacity memory cards, the simple data management on traditional smart cards (such as SIM cards) cannot adapt to the storage method of the paging structure of the physical management of flash memory and There are big problems with addressing and access mechanisms

Method used

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  • Embedded type file system suitable for smart card application environment
  • Embedded type file system suitable for smart card application environment
  • Embedded type file system suitable for smart card application environment

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Embodiment Construction

[0025] At present, there are already many mature file systems on PCs, such as the FAT file system under DOS, the NTFS file system under Windows NT, and the UNIX file system. However, these file systems are not suitable for direct storage of multimedia data content in embedded systems, because:

[0026] 1. The types of Flash used by embedded systems as mobile storage are relatively complex and diverse, and the file system must not only provide a file system for one application (such as U disk), but also provide a file system for other applications (such as SIM, SD, MMC, CF, etc.) etc.) A variety of Flash storage media with different physical layer interfaces provide file systems, and operations similar to abstraction and encapsulation must be performed on these different objects, so that upper-layer applications can use the same interface to complete file management for different objects. This is different from traditional disk management, which requires the file system design ...

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Abstract

The invention discloses an embedded file system suitable for an intelligent card application environment. A DOS subarea like comprises a boot sector, a file allocation table, a root directory and a data area; the file system comprises a file management module, a directory management module, a file allocation table management module, a file directory table management module, a logic disk management module and a cache management module. Through the storage of various data and files safely and reliably, the embedded file system can provide ultra-high capacity storage management with the capacity higher than megabyte level so as to realize the functions of a SIM card of sharing and exchanging data with currently dominating digital equipment such as personal computers, digital cameras and MP3 / MP4 players.

Description

technical field [0001] The invention relates to the field of smart card design and application, in particular to the design and application of a smart card file system with high computing performance, super large storage capacity and high-speed transmission interface. [0002] The smart card referred to in the present invention refers to a new large-capacity smart card whose basic function conforms to or adopts the ISO / IEC 7816 standard, and whose enhanced function adopts the latest technology in the industry. Background technique [0003] A smart card, also called an IC card, is a card that has an integrated circuit chip with storage, encryption and data processing capabilities embedded in a plastic substrate. Smart cards are divided according to the embedded chips, and can be divided into two categories: memory cards and microprocessor cards. The smart card in the present invention refers to a microprocessor card, also known as a CPU card. The integrated circuit in the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30G06F9/44G06F12/08G06F12/0817
Inventor 李菲菲秦预张武杰
Owner RDA MICROELECTRONICS SHANGHAICO LTD
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