Bidirectional Serial Interface Circuit for High-Speed Data Exchange
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Solution Overview
Problem
Current unidirectional serial transmission paths, such as those used in HDMI, require multiple interfaces for bidirectional high-speed data transmission, and lack support for broadband data and multichannel LPCM transmission, limiting reverse audio transmission capabilities.
Innovation Solution
An interface circuit with a transmission direction reversal control unit that requests and reverses the transmission direction in a serial transmission path, allowing bidirectional data transmission by switching the transmission direction in response to permission from the connected device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a unidirectional serial transmission path is used, then high-speed transmission is achieved, but bidirectional transmission requires multiple interfaces increasing device complexity
Solution Approach 1:
The patent implements dynamic transmission direction control by introducing a direction control signal that can switch the transmission path between forward and reverse directions. The serial transmission path transitions from a static unidirectional configuration to a dynamic bidirectional configuration, allowing a single interface to serve both transmission directions through time-division multiplexing controlled by the direction control signal.
2Device complexity
If a unidirectional transmission path is used, then simple interface design is achieved, but reverse audio transmission capability is lost
Solution Approach 1:
The patent makes the serial transmission path universal by enabling it to perform multiple functions: forward video/audio transmission, reverse audio transmission, and broadband data transmission. The single transmission path can adaptively switch between different transmission modes and directions based on the direction control signal, eliminating the need for separate dedicated interfaces for each function.
3Adaptability or versatility
If HDMI ARC is used for reverse audio transmission, then audio return is enabled, but broadband data and multichannel LPCM transmission are not supported
Solution Approach 1:
The patent changes the operational parameters of the serial transmission path by introducing direction control signals that enable different transmission modes. When configured for reverse direction with appropriate bandwidth settings, the path can support broadband data and multichannel LPCM transmission, transforming the limited ARC functionality into a high-capacity bidirectional data channel.
Data Source
AI summary
Bidirectional transmission is performed by switching transmission directions of a serial transmission path. A transmission system includes the first device that includes a transmission circuit which performs transmission to the second device through the transmission path, and a transmission direction reversal control unit which opens the transmission path after making a request for reversal of a transmission direction in the transmission path to the second device, and reverses the transmission direction at the transmission circuit in response to permission for reversal from the second device. The second device includes a transmission circuit which performs transmission to the first device through the transmission path, and a transmission direction reversal control unit which opens the transmission path in response to the request for reversal from the first device, and, when the first device becomes accessible, gives the first device the permission for reversing the transmission direction at the second transmission circuit.