Control device suitable to quick flash memory card and its construction methods

Abstract

A control device suits for flash memory card and its method features in that after the control device is turned on and finishes scanning PBA one by one of every information block of a memory card, itwill plan and divided the memory card into multiple fragment zones according to the capacity of a fragment PB mapping list, matching with another FAT image appended list in the control device to image the record of FAT logic address. When the host wants to operate on file memory, the fragment PB image list will be the image of information part in the fragment zone and the appended list will cooperate the operation system to provide quick to FAT when renewing.

Description

technical field [0001] The invention relates to a control device applicable to a flash memory card and a construction method thereof. Background technique [0002] The rapid development of the information industry, affected by the faster and faster CPU speed and the rise of IA products, high-speed data storage devices (memory) will also play an extremely important role. [0003] as the first figure 1 Shown in A, is the structure schematic diagram of general data storage system; A data storage device (such as Smart media memory card, Memory Stick memory card, or NAND type flash memory) 1I is mainly by means of a control device 20 and a computer mainframe 29 connection (of course, the control device 20 can also be built in a subsystem of the host computer 29), the control device 20 includes a microprocessor 23, which can be connected by a PCMCIA, ID, ATA, ATAPI, The host interface controller 24 of USB or its combined specification protocol is connected to the host computer 2...

AI Technical Summary

Problems solved by technology

[0006] 1. Data storage devices such as Smart Media memory card, Memory Stick memory card, or NAND flash memory all use the data block (Block) as the basic unit for erasing or storing data. With the increase of memory capacity, The number of its data blocks also increases accordingly, but the memory capacity of the mapping table is limited, so it cannot be compatible with higher-capacity data storage devices used in subsequent updates (because subsequent memory cards require larger memory) ;

[0007] 2. If high-capacity flash memory cards are required, the random access memory (RAM) designed in the control device to store all the physical block mapping table data must be relatively higher in capacity, which will relatively increase the cost of expenditure ;

[0008] 3. When the host computer accesses files, the control device will search the data blocks compared from the beginning to the end of the entire physical block mapping table for data access. The fetched data blocks all exist in the adjacent segments, so not only the operation time is consumed but also the memory capacity usage rate of the mapping table is wasted; and

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