SD (Secure Digital) CARD AND HOST CONTROLLER

摘要

It is possible to increase the data transfer rate of an SD card as compared to a conventional one and provide an SD card capable of performing data transfer by a method different from the conventional data transfer method. Among the four terminals used in the data transfer of the conventional method, respective two terminals are made into pairs. By using the respective pairs of terminals transfer can be performed by the differential signal method. A switching mechanism is provided so that the data transfer method can be switched between the conventional transfer method and the differential signal method. When both of the SD card and the host controller on which the SD card is mounted can perform data transfer by the differential signal method, data transfer is performed by the differential signal method.