USB-C Port Multiplexer Single-Ended Signaling Throughput
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Solution Overview
Problem
USB Type-C ports have limitations in data throughput due to differential signaling, which restricts the ability to support high-resolution monitors and applications like virtual reality, and existing solutions like Thunderbolt are expensive and complex.
Innovation Solution
Converting differential signals to single-ended signals for transmission through USB-C ports, using custom port multiplexer chips to increase bandwidth by doubling the number of signals that can be passed, and enabling alternate modes for increased throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If differential signaling is used in USB-C ports, then signal integrity and noise rejection are improved, but data throughput is limited to 40 Gbps maximum
Solution Approach 1:
The patent changes the signaling parameter from differential to single-ended mode. The port controller detects the presence of a dock and reconfigures the USB-C port to use single-ended signaling instead of the default differential signaling. This parameter change allows the same physical infrastructure to support higher data rates (80-100 Gbps) while maintaining compatibility with standard USB-C connectors and cables.
2Productivity
If Thunderbolt ports are used to increase data throughput to 40 Gbps, then support for high-resolution monitors and VR applications is improved, but device complexity and cost increase due to requiring three Thunderbolt chips
Solution Approach 1:
The patent extracts the signaling conversion function from complex Thunderbolt chip infrastructure and implements it directly in the USB-C port controller. By taking out the need for multiple Thunderbolt chips and their associated protocol tunneling services, the solution achieves high throughput using only the existing USB-C port and a simplified port controller that can detect docks and switch to single-ended mode.
Solution Approach 2:
The patent creates a simplified copy of the Thunderbolt functionality by implementing single-ended signaling capability directly in the USB-C port controller. Instead of relying on complex protocol tunneling through multiple Thunderbolt chips, the solution copies the essential high-speed signaling capability into the existing USB-C infrastructure, achieving similar performance with reduced complexity.
3Adaptability or versatility
If USB-C ports use four differential pairs for signaling, then compatibility with standard USB-C connectors is maintained, but bandwidth is insufficient for 5K, 8K, and 4K@120Hz applications
Solution Approach 1:
The patent implements dynamic reconfiguration of the USB-C port signaling mode. The port controller dynamically detects when a dock is connected and switches from static differential signaling to dynamic single-ended signaling. This allows the same physical connector and cable infrastructure to adapt its electrical characteristics based on the connected device, providing high bandwidth for docks while maintaining standard USB-C compatibility.
Data Source
AI summary
A computing device may include a universal serial bus (USB) port, a port controller, and a first port multiplexer. The port controller may determine that a connector of a cable has been connected to the port of the computing device and determine that the cable includes a second port multiplexer. The port controller may send a first instruction to the first port multiplexer to select a single-ended signaling configuration and send a second instruction to the second port multiplexer to select the single-ended signaling configuration. In the single-ended configuration, the first port multiplexer may receive a set of differential signals, convert the set of differential signals to a corresponding set of single-ended signals, and output the set of single-ended signals to the port.