eUSB Repeater Signal Conversion for FS/LS USB Devices
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Solution Overview
Problem
eUSB2 repeaters cause unnecessary power consumption and circuit complexity due to the need to switch between high speed (HS) and full/low speed (FS/LS) modes when connected to non-eUSB2 devices, leading to inefficient signal transmission.
Innovation Solution
An electronic device with an application processor and repeater that detects the operation speed of an external device, allowing HS mode transmission between the eUSB device and repeater, regardless of the external device's speed, by identifying and converting signals to match the external device's mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the eUSB device switches between HS and FS/LS modes to support non-eUSB2 external devices through the repeater, then compatibility with external devices is improved, but power consumption increases and circuit complexity increases
Solution Approach 1:
The system segments the USB communication interface into two independent parts: the eUSB2 interface between the eUSB device and repeater operates continuously in HS mode, while the USB2 interface between the repeater and external device operates in FS/LS mode. This segmentation allows each interface to operate independently without mode switching, resolving the contradiction by maintaining HS mode compatibility for eUSB2 devices while supporting FS/LS external devices through the repeater's conversion capability.
2Adaptability or versatility
If the eUSB device switches between HS and FS/LS modes to support non-eUSB2 external devices through the repeater, then compatibility with external devices is improved, but device complexity increases
Solution Approach 1:
The USB communication path is segmented into distinct functional blocks: the eUSB2 transceiver handles HS mode communication with the eUSB device, the USB2 transceiver handles FS/LS mode communication with external devices, and the repeater performs mode conversion. This segmentation eliminates the need for complex mode switching logic in the eUSB device, reducing circuit complexity while maintaining compatibility with both eUSB2 and non-eUSB2 external devices.
3Use of energy by moving object
If the eUSB device operates continuously in HS mode regardless of external device speed, then power consumption is reduced and circuit is simplified, but compatibility with FS/LS external devices may be compromised
Solution Approach 1:
The repeater acts as an intermediary device between the eUSB2 interface and USB2 interface. It receives HS mode signals from the eUSB device and converts them to FS/LS mode signals for compatibility with non-eUSB2 external devices. This intermediary approach allows the eUSB device to operate continuously in HS mode without mode switching, reducing power consumption and circuit complexity while maintaining full compatibility with FS/LS external devices through the repeater's conversion capability.
Data Source
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Figure 3A
AI summary
According to various embodiments, an electronic device comprises a first embedded universal serial bus (eUSB) device that performs an eUSB function, and an application processor including a processor that controls the first eUSB device. The electronic device may further comprise a repeater which is electrically connectable between the first eUSB device and an external device. The processor may be configured to perform monitoring to detect a connection of the external device to the electronic device. The processor may be further configured to identify a mode related to an operation speed of the external device. The processor may be further configured to, on the basis of the mode being identified as a full speed(FS) mode or a low speed(LS) mode, control the first eUSB device and the repeater to transmit or receive a signal therebetween in a high speed (HS) mode. Various other embodiments may be provided.