Memory card access module and memory card access method

A memory card access method applied to an electronic device, a processing unit of the electronic device being able to access a memory card via a memory card slot, and the electronic device comprising a data transmission path and a Peripheral Component Interconnect Express (PCIe) data transmission path, the method comprising:

• detecting whether the memory card supports a PCIe interface;
• connecting the processing unit and the memory card through the PCIe data transmission path rather than the data transmission path when the memory card supports the PCIe interface;
• connecting the processing unit and the memory card through the data transmission path on which a memory card access unit is disposed rather than the PCIe data transmission path when the memory card does not support the PCIe interface, wherein the memory card access unit comprises a terminal resistor which is inside the memory card access unit;
• controlling the memory card access unit to conduct data format conversion between a transmission interface and the PCIe interface when the memory card does not support the PCIe interface;
• and
• controlling the memory card access unit to unload the terminal resistor when the memory card is inserted in the memory card slot and the memory card supports the PCIe interface;
• wherein the processing unit is not electrically coupled to the data transmission path and the PCIe data transmission path at the same time, and the PCIe data transmission path does not include a conversion circuit.

A memory card access device, coupled between a processing unit and a memory card slot and used for accessing a memory card, the memory card access device comprising:

• a selection unit;
• a data transmission path between the selection unit and the memory card slot;
• a Peripheral Component Interconnect Express (PCIe) data transmission path that is between the selection unit and the memory card slot and does not include a conversion circuit;
• a memory card access unit, disposed on the data transmission path and configured to access the memory card and to provide data format conversion between a transmission interface and a PCIe interface;
• and
• a control unit, coupled to the memory card access unit and the selection unit;
• wherein the control unit is used for
• determining whether the memory card supports the PCIe interface;
• controlling the selection unit to connect the processing unit and the memory card through the PCIe data transmission path rather than the data transmission path when the memory card supports the PCIe interface;
• and
• controlling the selection unit to connect the processing unit and the memory card through the data transmission path rather than the PCIe data transmission path when the memory card does not support the PCIe interface;
• wherein the processing unit is not electrically coupled to the data transmission path and the PCIe data transmission path at the same time;
• wherein the memory card access unit comprises a terminal resistor which is inside the memory card access unit, and the control unit controls the memory card access unit to load the terminal resistor when there is no memory card inserted in the memory card slot or when the memory card is inserted in the memory card slot and the control unit determines that the memory card does not support the PCIe interface.