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Data transmission method of SD card controller

A data transmission method and data transmission technology, which are applied in the field of data transmission of SD card controllers, can solve problems such as distinction

Active Publication Date: 2010-09-22
苏州国芯科技股份有限公司
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  • Abstract
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Problems solved by technology

[0003] The invention provides a data transmission method of an SD card controller, the purpose of which is to distinguish whether the transmitted data is ordinary data used to realize the storage function of the SD card, or private data used to expand the function of the SD card or improve the performance of the SD card, so as to solve the problem of The problem of distinguishing data for different purposes during data transmission

Method used

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  • Data transmission method of SD card controller
  • Data transmission method of SD card controller
  • Data transmission method of SD card controller

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Embodiment

[0017] figure 1 It is the hardware block diagram of the SD card controller. It can be seen from the figure that the CPU is the central processing unit, the ROM is used to install the firmware, the SRAM and EFLASH are used to run the program or store data, and the SD2.0 interface is between the SD card controller and the access device. FIFO is a first-in-first-out data buffer used by SD interface, NAND FLASH interface is used to connect NAND FLASH memory, encryption engine module is used for security control, and PIT is a programmable timer.

[0018] In the process of data transmission, the SD card controller acts as the slave end, and the access device acts as the master end. In order to distinguish whether the data transmitted between the master end and the slave end is used for the ordinary data of the SD card to realize the storage function, or for the expansion of the SD card Function or improve the private data of SD card performance, the data transmission method of SD ca...

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Abstract

The invention relates to a data transmission method of an SD card controller, which is characterized in that: in order to distinguish the transmitted data is common data or private data, a private sector is defined in a memory space of the SD card controller in advance, and a private data characteristic field and a characteristic value are defined; when the data is written, whether to operate the private sector is judged first, and then whether the characteristic value is matched is judged so as to distinguish common data and private data; before reading the private data, a private reading enabling instruction is first sent to start a private reading enabling state; and when the data is read, whether the private sector is to be operated is first judged, and then the common data and the private data are distinguished according to the private reading enabling state. The invention provides a private data transmission channel, can transmit the private data capable of extending the functions of an SD card or improving the performance of the SD card with the channel so as to realize the firmware updating, the secondary development, the starting safety control, the hardware module diagnosis and other functions of the SD card.

Description

technical field [0001] The invention relates to the technical field of SD cards, in particular to a data transmission method of an SD card controller. This data transmission method may distinguish whether the transmitted data is ordinary data used to realize the storage function of the SD card, or private data used to expand the function of the SD card or improve the performance of the SD card. The private data can be used to realize the firmware update of the SD card, Functions such as secondary development, safety control, and hardware module diagnosis. Background technique [0002] SD card (Secure Digital Memory Card, Chinese translation is safe digital card) is a new generation memory device based on semiconductor flash memory, which has been used in portable devices such as digital cameras, personal digital assistants (PDA) and multimedia players. widely used. At present, the application of SD card is more and more extensive, and has been extended to some security app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/14G06F3/06
Inventor 郑茳肖佐楠匡启和王廷平
Owner 苏州国芯科技股份有限公司
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