Patent ID: 7779192

Claim:
A device comprising: connector pins including a plurality of data pins, a command pin, and a power signal pin, such that: only one of the data pins is configured to receive data in a first operation mode, and the plurality of data pins are configured to receive data in a second operation mode; and a set of registers connected to the connector pins, the set of registers storing own operation mode information of the device, the own operation mode information including bus width information which indicates one of the first and second operation modes, wherein: the command pin is configured to receive a first command for reading operation mode information, the operation mode information indicating one of the first and second operation modes; one of the connector pins is configured to transmit the operation mode information in response to the first command; the command pin is configured to receive a second command for reading operation voltage information, the operation voltage information concerning an operation voltage of the device; one of the connector pins is configured to transmit the operation voltage information in response to the second command; and the command pin is configured to receive a third command for setting an operation mode of the device into one of the first and second operation modes.