Embedded type file system suitable for smart card application environment

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...

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

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