Abstract: A memory system of an embodiment is connectable to a host and includes a nonvolatile memory and a memory controller. The memory controller includes: a signal line which transfers a signal sent from the host; a resistance element disposed between and electrically connected to the signal line and a wiring line given a reference potential of the memory system; a switching element connected serially to the resistance element and capable of switching a connection between the signal line and the wiring line; and a control circuit which controls the switching element to switch the connection between the signal line and the wiring line from a connected state to a disconnected state, when a change from a first potential to a second potential occurs on the signal line or when a change from the second potential to the first potential occurs on the signal line.

Abstract: A memory system of an embodiment is connectable to a host and includes a nonvolatile memory and a memory controller. The memory controller includes: a signal line which transfers a signal sent from the host; a resistance element disposed between and electrically connected to the signal line and a wiring line given a reference potential of the memory system; a switching element connected serially to the resistance element and capable of switching a connection between the signal line and the wiring line; and a control circuit which controls the switching element to switch the connection between the signal line and the wiring line from a connected state to a disconnected state, when a change from a first potential to a second potential occurs on the signal line or when a change from the second potential to the first potential occurs on the signal line.

Abstract: A memory system of embodiments includes a container, a first circuit board, a second circuit board, and an optical cable. The container has a hole connecting inside and outside the container. The first circuit board is disposed outside the container and has a first circuit to convert a first electric signal to an optical signal. The second circuit board is disposed inside the container and has a memory device, and a second circuit to convert the optical signal into a second electric signal and storing the second electric signal in the memory device. The optical cable transmits the optical signal from the first circuit board through the hole to the second circuit board.

Abstract: A memory system of embodiments includes a container, a first circuit board, a second circuit board, and an optical cable. The container has a hole connecting inside and outside the container. The first circuit board is disposed outside the container and has a first circuit to convert a first electric signal to an optical signal. The second circuit board is disposed inside the container and has a memory device, and a second circuit to convert the optical signal into a second electric signal and storing the second electric signal in the memory device. The optical cable transmits the optical signal from the first circuit board through the hole to the second circuit board.