Information processing apparatus, information processing system, and semiconductor storage device

An information processing system comprising a host device and a semiconductor storage device capable of being placed into the host device,

• the semiconductor storage device being a second type semiconductor storage device operating with m types of power supply voltages supplied from outside, the m types of power supply voltages being less than n types of power supply voltages, a first-type semiconductor storage device operating with the n types of power supply voltages supplied from outside, n being an integer of 2 or more, m being an integer of 1 or more and being less than n,
• the host device being configured to:
• check whether or not a notch is formed at a predetermined position of a semiconductor storage device placed into a connector included in the host device, when the host device is configured supply the m types of power supply voltages to the second-type semiconductor storage device;
• supply no power supply voltages to the semiconductor storage device placed into the connector, when the notch is not formed at the predetermined position of the semiconductor storage device placed into the connector;
• and
• supply the m types of power supply voltages to the semiconductor storage device placed into the connector, when the notch is formed at the predetermined position of the semiconductor storage device placed into the connector, wherein
• the second-type semiconductor storage device includes a plurality of power supply terminals, and a number of the plurality of power supply terminals is equal to a number of a plurality of power supply terminals included in the first-type semiconductor storage device, and
• the semiconductor storage device that is the second-type semiconductor storage device is configured to:
• determine whether the host device into which the semiconductor storage device is placed is a first-type host device supplying the n types of power supply voltages or a second-type host device supplying the m types of power supply voltages, based on a voltage of a first power supply terminal and a voltage of a second power supply terminal, or the voltage of the first power supply terminal, the first power supply terminal and the second power supply terminal being included in the plurality of power supply terminals of the semiconductor storage device;
• when the host device into which the semiconductor storage device is placed is the second-type host device, assert a clock request signal for the host device, the clock request signal being a signal that requests the host device to supply a reference clock signal;
• and
• when the host device into which the semiconductor storage device is placed is the first-type host device, not assert the clock request signal for the host device or assert the clock request signal for the host device after changing settings of an internal circuit of the semiconductor storage device so as to generate plural types of power supply voltages necessary for an operation of the semiconductor storage device from the n types of power supply voltages supplied to the plurality of power supply terminals.

A semiconductor storage device capable of being placed into a host device, comprising:

• a body;
• a nonvolatile memory provided in the body;
• a controller provided in the body and configured to control the nonvolatile memory;
• and
• a plurality of terminals arranged in the body, the plurality of terminals including a plurality of power supply terminals,
• the semiconductor storage device being a second-type semiconductor storage device operating with m types of power supply voltages supplied from outside, the m types of power supply voltages being less than n types of power supply voltages, a first-type semiconductor storage device operating with the n types of power supply voltages supplied from outside, n being an integer of 2 or more, m being an integer of 1 or more and being less than n,
• a number of the plurality of power supply terminals being equal to a number of a plurality of power supply terminals of the first-type semiconductor storage device,
• a notch that is a mechanical identifier indicative of the semiconductor storage device as the second-type semiconductor storage device being formed at a predetermined position of the body of the semiconductor storage device,
• the controller being configured to:
• determine whether the host device into which the semiconductor storage device is placed is a first-type host device supplying the n types of power supply voltages, or a second-type host device supplying the m types of power supply voltages, based on a voltage of first power supply terminal and a voltage of a second power supply terminal or the voltage of the first power supply terminal, the first power supply terminal and the second power supply terminal being included in the plurality of power supply terminals of the semiconductor storage device;
• when the host device into which the semiconductor storage device is placed is the second-type host device, assert a clock request signal for the host device, the clock request signal being a signal that requests the host device to supply a reference clock signal;
• and
• when the host device into which the semiconductor storage device is placed is the first-type host device, not assert the clock request signal for the host device or assert the clock request signal for the host device after changing settings of an internal circuit of the semiconductor storage device so as to generate plural types of power supply voltages necessary for an operation of the semiconductor storage device from the n types of power supply voltages supplied to the plurality of power supply terminals.