USB Data Transmission Over DisplayPort Link
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Solution Overview
Problem
Current data transmission interfaces and specifications, such as USB and DisplayPort, often have different data transmission protocols and rates, limiting interoperability and the ability to transmit data designed for one specification over a connection optimized for another.
Innovation Solution
A method and system that utilize a unidirectional main line and a bidirectional auxiliary line to transmit data at specific data rates, allowing USB data to be transmitted over a DisplayPort link by configuring the transmission link to operate at the required rates, including using one main link line for full-duplex data transfer and the auxiliary line for alternating half-duplex unidirectional transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data is transmitted over a bidirectional line at the native data rate of the link, then the link can maintain its standard operating speed, but USB data requiring higher data rates cannot be transmitted
Solution Approach 1:
The transmission link is divided into separate unidirectional channels (first unidirectional channel and second unidirectional channel) that can independently operate at different data rates. This segmentation allows each channel to be optimized for specific data transmission requirements, enabling USB data to be transmitted at USB revision 3.0 data rates while maintaining DisplayPort compatibility through proper channel configuration and data routing.
2Productivity
If different data transmission protocols are used for different specifications, then each interface can operate at its optimized rate, but interoperability between interfaces is inhibited
Solution Approach 1:
The patent introduces a mediator mechanism that translates and routes data between different protocol specifications. The system acts as an intermediary that can receive data in one specification format (e.g., DisplayPort) and transmit it in another specification format (e.g., USB 3.0) through proper data routing and rate adjustment, thereby enabling interoperability without sacrificing transmission efficiency.
3Device complexity
If a single link is configured for bidirectional transmission at standard rate, then the link structure remains simple, but high-speed unidirectional USB data transmission cannot be achieved
Solution Approach 1:
The link is segmented into multiple independent unidirectional channels with different data rates. The first unidirectional channel operates at a first data rate optimized for DisplayPort video transmission, while the second unidirectional channel operates at a second data rate optimized for USB data transmission. This segmentation allows high-speed USB data transmission without requiring complete redesign of the entire link structure.
Solution Approach 2:
The link configuration is made dynamic through programmable state machines that can adaptively route data between different channels based on the transmission requirements. The system can dynamically switch between unidirectional and bidirectional modes, and adjust data rates on the fly, allowing the same physical link to support multiple specifications and data rates as needed.
Data Source
AI summary
A data transmission system is provided. The data transmission system includes a source device having a source device controller and a register and a sink device having a sink device controller. The data transmission system also includes a transmission link coupling the source device and the sink device. The transmission link includes a unidirectional main line having a plurality of main link channels, a bidirectional auxiliary line configured to transmit data between the source device and the sink device at a first data rate, and a unidirectional interrupt line. The transmission link is configured to transmit data from the source device to the sink device over one of the main link lines at a second data rate and to transmit data from the sink device to the source device over the auxiliary line at the second data rate. The transmission link may comply with the DisplayPort standard, and the data may be transmitted in accordance with the USB standard.