Nonvolatile memory

本发明提供一种实现高速数据传送同时保证包含非易失性存储器的卡型存储设备的兼容性的技术。也就是，在包含非易失性存储器的卡型存储设备中，提供多个数据端子，并且接口部件具有用于确定数据端子的电平的电路。多个数据端子的一些或全部与上拉电阻器相连，以上拉到电源电压。当确定电路确定与上拉电阻器相连的数据端子处于打开状态时，确定电路改变数据的总线宽度(位数)。 There is provided a technology to realize high speed data transfer while compatibility of a card type storage device comprising a nonvolatile memory is ensured. Namely, in the card type storage device comprising the nonvolatile memory, a plurality of data terminals are provided and an interface unit is provided with a circuit for determining levels of data terminals. Some or all of the plurality of data terminals are connected with pull-up resistors for pulling up to a power source voltage. When the determination circuit determines that the data terminals connected with the pull-up resistors are in an open condition, the determination circuit switches a bus width (number of bits) of data.