Data storage device and control method for power-saving modes of serial interface thereof

A control method for a power-save mode of a serial interface in a data storage device that preferentially switches said serial interface to said power-save mode, said control method comprising:

• receiving a command from a host;
• identifying content of said command;
• and
• setting said serial interface in said power-save mode for at least a period of time during which no sending and receiving of data through serial data communication with the host exists in an execution sequence that is performed in accordance with said command.

A data storage device which executes sending and receiving of data through serial data communication with a host, said device comprising:

• a serial interface which interfaces serial data communication with said host and preferentially makes switching to a power-save mode;
• and
• a controller which identifies content of a command received from said host and controls a command execution sequence;
• wherein said serial interface is set to said power-save mode for at least a partial period of time during which no sending and receiving of data exists through serial data communication with said host.

A data storage device which executes sending and receiving of data through serial data communication with a host, said device comprising:

• a serial interface which interfaces serial data communication with said host and makes switching to a power-save mode independently from other circuits;
• and
• a controller which identifies content of a command received from said host and controls a command execution sequence;
• wherein said serial interface is switched to a power-save mode in responding to completion of said command execution.