Electronic device for communicating with external device through USB interface and operation method therefor

An operation method of an electronic device, the method comprising:

• monitoring to detect a connection of an external device to the electronic device, the electronic device including an application processor internally comprising both a first embedded universal serial bus (eUSB) device and a processor, wherein the electronic device includes an identification circuit separately coupled to the application processor, the repeater, and the external device;
• identifying a mode related to an operation speed of the external device;
• and
• based on the identification that the mode is a full speed (FS) mode or a low speed (LS) mode, allowing a first signal to be transmitted or received in a high speed (HS) mode between a first eUSB device configured to perform an eUSB function and a repeater configured to be electrically connectable between the first eUSB device and the external device by controlling the repeater to operate in the HS mode through a reset signal, the first eUSB device and the repeater being included in the electronic device, and allowing a second signal to be transmitted or received in the identified FS mode or LS mode between the repeater and the external device.

A method comprising:

• monitoring, by an electronic device, to detect a connection with an external device through an identification terminal included in a connector of an electronic device;
• receiving, from the external device, a signal having a pattern based on a specified protocol and a synchronous (SYNC) pattern;
• responsive to identifying that a mode of the external device is one of a full speed (FS) mode or a low speed (LS) mode, transmitting, from the electronic device to the external device, an end-of-packet pattern and a SYNC signal having a pattern corresponding to the mode of the external device;
• responsive to receiving a reset signal, configuring, by the electronic device, an operation mode of an embedded USB (eUSB) device to operate in the HS mode between the eUSB and a repeater, wherein the electronic device includes an application processor internally comprising both the eUSB device and a processor configured to control the eUSB device, and wherein the electronic device includes an identification circuit separately coupled to the application processor, the repeater, and the external device;
• converting, by the electronic device, a received HS mode signal to an FS mode signal or an LS mode signal based on the mode of the external device;
• and
• transmitting, by the electronic device, the FS mode signal or the LS mode signal to the external device.