A method and device for self-transferring SD card data based on ahb bus
A data and bus technology, applied in the field of AHB bus-based SD card data self-transfer method and device, can solve the problems of starting software code and data that cannot be changed, occupying the internal area of the chip, and lack of flexibility, etc.
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Embodiment 1
[0045] The embodiment of the present invention provides a method for self-transporting data of a secure digital SD card based on an advanced high-performance bus AHB bus. The method is applied to an SD card data self-transporting circuit, and the circuit includes a clock enabling module (1), an SD card An initialization module (2), a direct memory access DMA enabling module (3), and an arbitration module (4). like figure 1 As shown, the method includes:
[0046] Step 101: the clock enabling module (1) receives a start signal;
[0047] Step 102: the arbitration module (4) enables the clock enabling module (1) to work according to the state of the controller of the SD card;
[0048] Step 103: the clock enabling module (1) completes the initialization of the SD card controller;
[0049] Step 104: the arbitration module (4) makes the SD card initialization module (2) work according to the state of the SD card controller;
[0050] Step 105: SD card initialization module (2) com...
Embodiment 2
[0081] The embodiment of the present invention provides a self-transporting device based on AHB bus SD card data, such as figure 2 As shown, the device includes four modules of a clock enable module (1), an SD card initialization module (2), a DMA enable module (3), and an arbitration module (4), wherein the arbitration module (4) is connected to the clock respectively. The enabling module (1), the SD card initialization module (2), and the DMA enabling module (3) are connected, the clock enabling module (1) is connected to the SD card initialization module (2), and the SD card initialization module (2) is connected to the DMA The enabling module (3) is connected.
[0082] Specifically, when the enabling signal is valid, the clock enabling module (1) first starts to work, and secondly, the arbitration module (4) makes the clock enabling module (1) obtain the circuit control right according to the state of the SD card controller. After the clock enabling module (1) obtains th...
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