Electronic device, electronic device control method, and electronic device system

An electronic device comprising:

• a control unit configured to determine whether an external device connected to said electronic device is compatible with two-way transmission or not;
• a digital signal transmission/reception unit configured to perform two-way transmission of a digital signal using a plurality of differential signal lanes prepared at a transmission path with said external device;
• a transmission path arrangement determining unit configured to determine a transmission path arrangement including the number of use lanes, a use lane number, and a transmission direction by performing communication with said external device using a two-way communication line prepared at said transmission path with said external device;
• and
• a transmission path arrangement control unit configured to control the arrangement of said digital signal transmission/reception unit based on the information of the transmission path arrangement determined at said transmission path arrangement determining unit.

A control method for an electronic device including a digital signal transmission/reception unit configured to perform two-way transmission of a digital signal using a plurality of differential signal lanes prepared at a transmission path with an external device, said method comprising:

• determining whether said external device connected to said electronic device is compatible with two-way transmission or not;
• determining a transmission path arrangement including the number of use lanes, a use lane number, and a transmission direction by performing communication with said external device using a two-way communication line prepared at said transmission path with said external device;
• and
• controlling the arrangement of said digital signal transmission/reception unit based on the information of the transmission path arrangement determined at said determined transmission path arrangement.