USB Control Circuit Bypass for OTG Role Swapping
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Solution Overview
Problem
Conventional USB hub devices restrict the functionality of On-the-Go (OTG) devices by not allowing role swapping between upstream and downstream ports, limiting their usage flexibility.
Innovation Solution
A USB control circuit with switch circuits and a control unit that enables the USB hub device to operate in both common and bypass modes, allowing OTG devices to swap roles by selectively coupling interfaces and signal channels, thereby bypassing the conventional port restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional USB hub device uses fixed port role assignment, then data communication can be conducted successfully through the hub device, but the functions of OTG devices are severely restricted and usage flexibility is reduced
Solution Approach 1:
The patent implements dynamic port role assignment where the USB hub device can automatically detect the role (host or peripheral) of OTG devices connected to upstream and downstream ports and switch port functions accordingly. This dynamic adaptation allows OTG devices to play their appropriate roles without manual configuration, resolving the contradiction between versatility and complexity by using automated role detection and switching mechanisms
Solution Approach 2:
The patent changes the operational parameters of the USB hub device by enabling port roles to be switched between host and peripheral modes based on the connected devices. The control unit adjusts the functional parameters of upstream and downstream ports dynamically, allowing the same physical port to serve different logical functions, thereby improving adaptability without requiring additional hardware complexity
2Adaptability or versatility
If USB hub device allows role swapping between ports, then adaptability of OTG devices is improved, but control mechanism complexity increases
Solution Approach 1:
The USB hub device performs self-detection of OTG device roles through automatic identification of device types connected to each port. The control unit autonomously determines whether connected devices are hosts or peripherals and automatically configures the appropriate port roles without external intervention, reducing control mechanism complexity while enabling role swapping capability
Solution Approach 2:
The patent implements a feedback mechanism where the control unit continuously monitors the status and role of devices connected to upstream and downstream ports. Based on this feedback information, the control unit automatically adjusts port configurations to enable proper role swapping, resolving the contradiction by using intelligent feedback-based control rather than complex manual configuration mechanisms
Data Source
AI summary
A USB hub device includes an upstream port and a downstream port. A USB control circuit of the USB control circuit includes an upstream interface; a downstream interface; a first switch circuit for coupling with the upstream port; a second switch circuit for coupling with the downstream port; a control signal transmission interface coupled with the first switch circuit and the second switch circuit; and a control unit, coupled with the control signal transmission interface, configured to operably control the first switch circuit and the second switch circuit through the control signal transmission interface, so that the first switch circuit selectively couples one of the upstream interface and the second switch circuit with the upstream port, while the second switch circuit selectively couples one of the downstream interface and the first switch circuit with the downstream port.