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Method for multiplexing interface of SD card and SD card with expanded function

An interface multiplexing, USB interface technology, applied in the field of memory cards, can solve problems such as single function

Active Publication Date: 2012-09-05
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of interface multiplexing method of SD card and the SD card with extended function applying this method for the defect that the current memory card interface protocol is fixed and the function is single, thereby on the basis of enhancing the function of the memory card, It can also save production costs

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  • Method for multiplexing interface of SD card and SD card with expanded function
  • Method for multiplexing interface of SD card and SD card with expanded function
  • Method for multiplexing interface of SD card and SD card with expanded function

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] SD card is a new-generation storage device based on semiconductor flash memory. Its structure can ensure the security of digital file transmission and is easy to reformat. Therefore, it has a wide range of applications. Multimedia files such as music, movies, and news are all It can be conveniently saved to the SD card, and has been widely used in digital products such as MP3 players, digital video cameras, and digital cameras.

[0027] Generally speaking, people regard SD card as a convenient storage device. However, in some applications, people hope that the SD card can achieve more functions, such as data input and output through the USB interface, and communication with the card access device through the interface of the ISO / IEC7816 protocol. Therefore the present invention expands USB and ISO / IEC 7816 functions on the basis of th...

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Abstract

The invention relates to the field of memory cards, in particular to a method for multiplexing an interface of an SD card and an SD card with expanded function. The method comprises the following steps: on a 9-pin interface defined by an SD card protocol, multiplexing the USB interface, the ISO / IEC7816 interface and the GPIO interface respectively or simultaneously; and by controlling corresponding pins, realizing the function of various interfaces respectively or simultaneously. The corresponding SD card comprises a memory unit arranged in a card body and a controller connected with the memory unit, wherein the controller is connected with the 9-pin interface arranged on the surface of the card body; the inside of the controller is provided with an SD interface control module and is alsoprovided with a USB interface control module, an ISO / IEC7816 interface control module and a GPIO interface control module respectively or simultaneously; and the interface control modules are connected with corresponding pins according the pin multiplexing rule. The SD card saves production cost on the basis of improving the function of the memory card, and has quite good application prospect.

Description

technical field [0001] The invention relates to the field of memory cards, in particular to an SD card interface multiplexing method and an SD card with extended functions. Background technique [0002] SD card (Secure Digital Memory Card) Chinese translation is a secure digital card, which is a new generation of storage devices based on semiconductor flash memory, which is widely used in portable devices, such as digital cameras, personal digital assistants (PDA) and Multimedia player etc. The SD card was jointly developed by Panasonic, Toshiba and SanDisk in August 1999. The SD card is connected to a dedicated drive through a 9-pin interface and does not require additional power to maintain the information stored on it. SD card technology is developed based on MulltiMedia card (MMC), which is about the same size as MMC, with a size of 32mm×24mm×2.1mm. The length and width are the same as MMC, only 0.7mm thicker than MMC to accommodate storage units with larger capacity....

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/40G06K19/07
Inventor 刘杰王峥刘华
Owner SPREADTRUM COMM (SHANGHAI) CO LTD