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
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[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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