Patent ID: 9007864
Filing Date: 2015-04-14
Classification: G11C

Abstract:
1. A nonvolatile storage device connected to an information processing apparatus via a voltage line for supplying a power source from the information processing apparatus, a clock line for supplying a clock signal from the information processing apparatus, and one or more communication lines capable of bidirectionally communicating signals with the information processing apparatus, comprising: a nonvolatile memory capable of storing data in a nonvolatile manner; a card regulator which is connected to the voltage line and which outputs a first voltage supplied from the information processing apparatus or a second voltage that is lower than the first voltage; a card input/output driver which is connected to the card regulator and the communication line, and which drives the communication line with the output of the card regulator as a power source; a card voltage detection circuit which is connected to the communication line in the nonvolatile storage device and which detects that a voltage of the communication line is the second voltage and detects that the voltage of the communication line is a voltage that is lower than the first voltage and is higher than the second voltage; and a card control unit for detecting whether a drive voltage of the information processing apparatus and a drive voltage of the nonvolatile storage device are different based on an output voltage of the card regulator and a detection result of the card voltage detection circuit.