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SD card with boot function and card manufacturing method of SD card

A function and controller technology, applied in the field of SD card with boot function and its production card, can solve the problems of high cost, complex circuit, large PCB board area, etc. Effect

Pending Publication Date: 2018-07-17
NANJING HEYANGTEK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NAND Flash has a lot of pins, the circuit is complex, and it takes up a large area of ​​PCB board. At the same time, the control method of NAND Flash for read and write access is complicated and difficult to develop.
The eMMC solution solves these problems, but at a higher cost

Method used

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  • SD card with boot function and card manufacturing method of SD card
  • SD card with boot function and card manufacturing method of SD card
  • SD card with boot function and card manufacturing method of SD card

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Experimental program
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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] An SD card with a boot function provided by the present invention is realized on an SD card controller chip, and includes a scheme for entering a boot mode, a scheme for exiting the boot mode, and a scheme for switching between the boot mode and the normal working mode.

[0021] In the present invention, the CMD0 command with specific parameters is transmitted from the main control to the SD card controller chip, and the controller will analyze the command. If it is judged as a boot mode request, it will notify the internal software of the controller to automatically transfer the data in the main program area to the SD card controller chip. Upload to the master. During the transmission process, the controller will monitor the command sent by the main control, if there is a stop command, it will stop the data upload and switch to the normal working mode.

[0022...

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PUM

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Abstract

The invention discloses an SD card with a boot function and a card manufacturing method of the SD card. A main controller downloads a CMD0 instruction with specific parameters to an SD card controllerchip, a controller can parse the instruction, software in the controller can be informed when it is judged that the instruction is a boot mode request, and data in a main program area is automatically uploaded to the main controller. In the transmission process, the controller can monitor the instruction downloaded by the main controller, stop data uploading if a stopping instruction exists and switch the mode into a normal working mode, the boot function is integrated on an SD controller, the application scene of the SD card is expanded, and the upgrading of the product function is realized.

Description

technical field [0001] The invention belongs to the field of integrated circuit chip design, in particular to an SD card with a boot function and a method for making the card. Background technique [0002] At present, the widely used SD card includes two parts: SD card controller and flash, which are widely used in the field of daily storage. In various embedded applications, programs often need to be updated, which requires the main The program code controlling the CPU can support the update function. At present, the mainstream scheme is that the program code of the main control CPU is divided into two parts, the startup code and the main code. Among them, the startup code is relatively small and placed in the built-in ROM of the chip, which cannot be changed. The main code is placed on NANDflash or eMMC with boot function, which can be rewritten or updated many times. NAND Flash has a lot of pins, the circuit is complex, and occupies a large area of ​​the PCB board. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/06
CPCG06F3/0629G06F3/0658G06F9/4406G06F9/4411G06F9/4401
Inventor 万波后嘉伟廖炳隆
Owner NANJING HEYANGTEK CO LTD
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