Patent ID: 7711865

Claim:
A movable storage device combined with a smart card, comprising: a plurality of signal pins that are connected to at least one of a plurality of memory card hosts that use different communications protocols from each other or a smart card host, and at least one signal pin is used as a mode distinguishing pin; a mode deciding unit that decides an operation mode of one of a smart card mode and a memory card mode according to a level of a first initial input signal received from the mode distinguishing pin; a smart card module that communicates with a smart card host in the smart card mode; and a memory card module that can be interfaced with the plurality of memory card hosts, and communicates with one of the plurality of memory card hosts connected in the memory card mode and stores data, wherein the level of the first initial input signal corresponds to an initial state of a data bus for distinguishing mode of a connected host; and an initial state of a data bus for distinguishing mode of the smart card host and an initial state of a data bus for distinguishing mode of the memory card host are different from each other; wherein the mode distinguishing pin is used as the signal pin after an operation mode is determined by the mode deciding unit; and the smart card module and the memory card module share the mode distinguishing pin; wherein some or all of a plurality of signal pins are used as the host distinguishing pin, the level sensing unit comprises level sensing circuits that corresponds to each host distinguishing pin, and each of the level sensing circuits includes: a pull-up resistance, an end of which being connected to an internal voltage; and a switching circuit that connects the pull-up resistance in parallel to the memory card data line in response to the sensing control signal.