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A kind of sd card and data access method

A technology for data access and data storage, applied in the direction of electrical digital data processing, instruments, input/output to record carriers, etc., can solve the problems of low data transmission rate, can not meet the high-speed data processing, etc., to achieve the effect of improving efficiency

Active Publication Date: 2015-12-02
北京万协通信息技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the data transmission rate of the above two methods is still low, which cannot meet the growing demand for high-speed data processing.

Method used

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  • A kind of sd card and data access method
  • A kind of sd card and data access method
  • A kind of sd card and data access method

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Embodiment Construction

[0021] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is further described:

[0022] like figure 1 As shown, it is a schematic diagram of the circuit structure of the SD card of the present invention. The SD card 100 includes a RAM controller 10, an SD controller 20, an encryption / decryption unit 30, an NF controller 40, at least three RAMs 50 and a storage unit 60. The RAM controller 10 is connected to the SD controller 20, The encryption / decryption unit 30 , the NF controller 40 and at least three RAMs 50 . Wherein, the shown storage unit 60 is preferably NandFlash. The SD card 100 can be electrically connected to an electronic device 200, and the electronic device 200 is a digital camera, MP3, or the like. The SD card 100 includes a storage state for storing data from the electronic device 200 to the storage unit 60 and a reading state for reading data from the storage unit 60 to the electronic device 200 .

[0023] The RA...

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Abstract

The invention discloses a secure digital memory (SD) card which can be connected with an electronic device. In a storage state, a random access memory (RAM) controller controls an SD controller to periodically receive data from the electronic device and cyclically write the data into each RAM in sequence, controls an encryption and decryption unit to periodically and cyclically encrypt the data in each RAM in sequence, and controls a NandFlash (NF) controller to periodically and cyclically read the data from each RAM in sequence and store the data into a storage unit of the SD card. In a read state, the RAM controller controls the NF controller to periodically read the data from the storage unit and cyclically store the data into each RAM in sequence, controls the encryption and decryption unit to periodically and cyclically encrypt the data in each RAM in sequence, and controls the SD controller to periodically and cyclically read the data from each RAM in sequence and store the data into the electronic device. The invention also discloses a corresponding data access method. By adoption of the SD card and the data access method, the data are transmitted in an assembly line work mode, and the transmission efficiency of the data is improved.

Description

technical field [0001] The invention relates to the field of data access, in particular to an SD card and a data access method corresponding to the SD card. Background technique [0002] At present, there are two main ways of data transmission (reading and storage) for SD card (Secure Digital Memory Card): the way based on CPU (Central Processing Unit) and the way based on DMA (Direct Memory Access). Among them, when data is transmitted based on the CPU, the CPU of the chip directly stores the received data from the SD card to the RAM (random access memory) of the system or directly reads the data from the RAM of the system to the SD card. The transmission of the CPU requires Executing the instruction cycle, the speed of data transmission is slow, and it needs to occupy CPU resources in real time; when data is transmitted based on DMA, the DMA controller directly copies the data from one address space to another address space without the direct participation of the CPU. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/06G06F13/16
Inventor 周鹏张玉禄
Owner 北京万协通信息技术有限公司
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