USB Signal Switch Circuitry for Host Peripheral Role Reversal
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Solution Overview
Problem
Standard USB hubs do not support the reversal or swapping of host and peripheral roles, which is necessary for devices like mobile phones and tablets that can act as both hosts and peripherals, especially in automobile infotainment systems where simultaneous connectivity is required.
Innovation Solution
A USB system with a hub and switch circuitry that includes multiple switching units and control circuitry to manage signal paths and port connections, allowing devices to operate as both USB hosts and peripherals concurrently by switching and multiplexing USB D+/D− signals, enabling connection to both USB host and peripheral devices simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard USB hub is used for connectivity, then USB peripheral device connection is supported, but USB host device connection and role reversal is not supported
Solution Approach 1:
The USB signal path is segmented into multiple controllable segments using switching units (e.g., first switching unit, second switching unit). Each switching unit independently controls signal flow between specific ports, allowing flexible reconfiguration of host and peripheral roles without requiring complete system redesign.
Solution Approach 2:
The system dynamically reconfigures signal paths based on the operational role (host or peripheral) of connected USB devices. Control circuitry detects device roles and automatically switches signal paths through the switching units, enabling adaptability without manual intervention or complex dedicated circuitry.
2Reliability
If dedicated ports are used for host and peripheral devices, then connection stability is improved, but system complexity and port management become more difficult
Solution Approach 1:
USB ports are designed with multi-functionality to serve both host and peripheral roles. The same physical ports can dynamically switch between hosting and peripheral operations based on connected device detection, eliminating the need for separate dedicated host and peripheral ports while maintaining connection reliability.
Solution Approach 2:
The switching units act as intermediaries between USB ports and the hub, managing signal flow and role assignment. This intermediary layer simplifies port management by automatically handling the complexity of role reversal and signal path configuration, making the system easier to operate while maintaining stable connections.
3Measurement precision
If signal path rearrangement is required for role switching, then connection accuracy is improved, but switching time and operational complexity increase
Solution Approach 1:
Multiple signal paths are pre-configured through the switching units during system initialization. When role switching is needed, the control circuitry simply activates the pre-prepared signal path corresponding to the new role, eliminating the need for complex real-time rearrangement and reducing switching time while maintaining configuration accuracy.
Data Source
AI summary
A universal serial bus (USB) apparatus that has a USB hub, a first switching unit including first end coupled to a USB peripheral port of a first device, a second switching unit including a second end coupled to the USB hub and the first switching unit and a first end configured to be coupled to a first USB device, and control circuitry operable to provide control signals to the first and second switching units, in which the first control signals cause the first and second switching units to provide connectivity between the USB peripheral port of the first device and the first USB device when the first USB device is operating as a USB host and the second control signals to provide connectivity between the USB host port to the first USB device via the USB hub when the first USB device is operating as a USB peripheral.