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File allocation table accessing device, chip and accessing method

A file allocation table and access device technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of slow speed, low efficiency, occupation, etc., and achieve the effect of cost reduction and high-speed FAT access performance

Inactive Publication Date: 2006-06-21
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the timing limitation of the MCU accessing the external storage medium, the speed of accessing large files, especially large files that are not continuously stored, is relatively slow and requires a lot of MCU time, which is inefficient.

Method used

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  • File allocation table accessing device, chip and accessing method
  • File allocation table accessing device, chip and accessing method
  • File allocation table accessing device, chip and accessing method

Examples

Experimental program
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Embodiment Construction

[0027] In order to combine the flexibility of the MCU and the high efficiency of the hardware circuit, the present invention uses the MCU to provide a file access interface, and uses a hardware FAT access device to process all FAT data. The FAT access device of the present invention is applied to various ASIC chips, supports the FAT file system, and provides FAT operations corresponding to operations such as file search, file space allocation, file deletion, and file update.

[0028] refer to figure 1 , figure 1 It is a structural block diagram of a FAT access device according to an embodiment of the present invention. The FAT is stored in a storage medium 15 located outside the FAT access device 10 , and the FAT access device 10 includes a FAT sector processing module 11 , a memory 12 and a next cluster processing module 13 . Wherein, the FAT sector processing module 11 reads the FAT data of specifying N sectors in the storage medium 15 into the memory 12, and writes the FA...

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Abstract

The invention discloses a visiting device of file allocation table (FAT), which consists of assembly special integrated circuit (ASIC) chip and visiting method, wherein the FAT is stored in the storage dielectrics; the visiting device contains FAT sector disposal device, storage and next cluster disposal device; the FAT sector disposal device reads the present N sectors data in the storage (N is natural number); the storage stores the FAT data; the next cluster disposal device reads the FAT data to obtain the present capacity, which sends the FAR data reading request of next cluster to the FAT sector. The invention uses the least RAM to improve the high-speed FAT visiting property, which reduces the cost greatly.

Description

technical field [0001] The invention relates to a file access device, a chip and an access method, in particular to a file allocation table access device, an application-specific integrated circuit chip including the access device, and an access method. Background technique [0002] At present, in various ASIC chips, there are mainly two methods for operating the file system: one method is to read the entire file allocation table (FAT) when the system is powered on, and record each file in the random access memory (RAM). Information about the file. This method can achieve relatively fast file access speed, but has an obvious disadvantage, that is, the total number of supported files is limited. Otherwise, a large-capacity RAM is required, and generally built-in RAM has great limitations. If an external RAM is used, the cost will increase. Therefore, using this method to operate a memory card with a large capacity (such as 1G byte) is somewhat unrealistic. [0003] Another...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 李晓强张浩
Owner VIMICRO CORP