Electronic data flash memory card with flash memory controller
A technology of flash memory controller and electronic data, applied in the direction of preventing unauthorized use of memory, memory address/allocation/relocation, input/output to record carrier, etc., can solve the problem of occupying host system resources, increasing management flash memory processing time, Increase ASIC complexity and other issues to achieve the effect of speed improvement
Inactive Publication Date: 2009-05-13
INFOMICRO ELECTRONICS (SHENZHEN) CO LTD
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- Application Information
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Problems solved by technology
However, marking adds ASIC complexity when the host system writes the sector
[0013] A disadvantage of the above method and other known devices is that it involves additional host system resources for processing proprietary protocols and thus increased processing time for managing the flash memory
Method used
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[0086] According to one embodiment of the present invention, the input / output interface circuit 5A, the reset circuit 23 and the power regulator 22 are integrated or partially integrated on the processing unit 2A, which greatly reduces the required space, complexity and manufacturing cost.
[0087] Small size and cost are key factors for mobile devices such as the electronic data flash cards described herein. Current IC packaging technology can integrate discrete IC components of different technologies and materials into one IC package. For example, the input and output interface circuit is a mixed circuit of analog and digital, which can be integrated with the processing unit on the MCP (Multi-Chip Package) package. The reset circuit and the power regulator are analog circuits, which can also be integrated with the processing unit on the MCP package.
[0088] The characteristics of mixed-signal integrated circuit technology allow the mixed integration of analog circuits and ...
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An electronic data flash card is accessible by a host computer, and includes a processing unit connected to a flash memory device that stores a data file, and an input-output interface circuit activated so as to establish a communication with the host computer. In an embodiment, the electronic data flash card uses a USB input / output interface circuit for communication with the host computer. A flash memory controller includes an index for converting logical addresses sent by the host computer into physical addresses associated with sectors of the flash memory device. The index is controlled by arbitration logic referencing to values from various look up tables and valid data stored in the flash memory device. The flash memory controller further includes a first-in-first-out unit (FIFO) for recycling obsolete sectors of the flash memory device in the background process so that they are available for reprogramming.
Description
technical field [0001] The invention relates to an electronic data flash card, in particular to a system and method for controlling flash memory in the electronic data flash card. Background technique [0002] Personal data files stored on floppy disks or transmitted over the network usually require passwords or encrypted codes to ensure the security of the files, and personal files are sent after being securely packaged or compressed. However, during transmission, personal data files and documents are likely to be leaked due to the destruction of passwords, encrypted passwords, full packaging or secure compressed packages, resulting in unauthorized access to personal information. [0003] With the development of flash memory technology, flash memory will gradually replace traditional disks as the storage medium of mobile systems. Flash memory has significant advantages over floppy disks or magnetic hard disks, such as high G impedance and low power consumption. Flash memor...
Claims
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IPC IPC(8): G06F12/14G06F12/02G06F3/06
Inventor 马治刚李中和俞一康李威若沈明祥
Owner INFOMICRO ELECTRONICS (SHENZHEN) CO LTD