Patent ID: 7886123

Claim:
A storage device comprising: a command terminal; a plurality of data terminals; a clock terminal; a power terminal for a power supply voltage; a ground terminal for a ground voltage; a nonvolatile memory; and a controller coupled to the command terminal, the data terminals, the clock terminal, the power terminal, and the ground terminal, wherein: the controller is configured to receive the clock signal through the clock terminal from the outside of the storage device; the controller is configured to output data through at least one of the data terminals to the outside of the storage device, in accordance with only one of a rising edge and a falling edge of the clock signal, in a first transfer mode; the controller is configured to output data through at least one of the data terminals to the outside of the storage device, in accordance with both the rising edge and the falling edge of the clock signal, in a second transfer mode; the controller is configured to receive a first command through the command terminal from the outside of the storage device; the controller is configured to output first status data that includes information indicating that the storage device supports the second transfer mode, through one of the data terminals to the outside of the storage device, in response to the first command; the controller is configured to receive a second command through the command terminal from the outside of the storage device; and the controller is configured to set the storage device into the second transfer mode in response to the second command.