USB Active Cable LFPS Signal Detection and Proxy Generation
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Solution Overview
Problem
Current active cable transmission methods, particularly for USB 3.0 and above, face challenges in maintaining high-speed signal quality, especially for LFPS signals, due to issues like signal attenuation, incomplete signal cycles, and lack of feedback mechanisms in link training, leading to compatibility problems and inefficient energy usage.
Innovation Solution
A transmission and receiving unit system that includes a LOSS detection module, control module, and output circuit for active cables, which detects AC signals and idle states to manage AC and DC components, and a proxy module for generating compliant LFPS signals, along with re-training mechanisms to optimize link training and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct transmission is used for LFPS signals, then the circuit structure is simple and frequency is maintained, but the circuit may miss part of the signal at the beginning and end, causing abnormal signals that are not compliant with USB protocol
Solution Approach 1:
The patent applies preliminary action by detecting the LOSS state before actual signal transmission and preparing the circuit in advance. The transmission unit detects whether the transmission path is in an idle state before transmitting LFPS signals, and the receiving unit detects LOSS states before processing signals. This preliminary detection allows the circuit to be properly configured before signal arrival, avoiding the missed signal edges problem while maintaining circuit simplicity.
2Reliability
If proxy transmission is used for LFPS signals, then the output LFPS signal complies with USB protocol requirements, but the detection and processing time becomes longer, resulting in missing transmission of ping.LFPS signal
Solution Approach 1:
The patent introduces feedback mechanisms through LOSS detection modules that continuously monitor the transmission path state. The transmission unit receives feedback about the idle state of the transmission path, and the receiving unit receives feedback about the input circuit state. This feedback allows the system to quickly respond to ping.LFPS signals by detecting the LOSS state and generating appropriate proxy signals without excessive delay, thus reducing time loss while maintaining protocol compliance.
3Device complexity
If fixed settings are used for high-speed signal transmission, then the configuration is simple, but the performance does not change with the system and is not optimal, and power consumption is not optimized
Solution Approach 1:
The patent applies dynamics by making the transmission system adaptive rather than fixed. The transmission unit and receiving unit dynamically detect system conditions (such as LOSS states, signal presence, and transmission path status) and adjust their operation accordingly. This dynamic behavior allows the system to optimize performance for different transmission scenarios and adjust power consumption based on actual needs, moving away from fixed settings to condition-based adaptation.
4Productivity
If re-training mechanism is added to USB protocol, then link training can be optimized and adjusted, but the protocol complexity increases
Solution Approach 1:
The patent applies self-service by implementing automatic link training optimization without requiring complex protocol changes. The transmission unit and receiving unit autonomously detect transmission conditions and adjust their operation. The system self-manages the link training process by detecting LOSS states and automatically adapting to optimal transmission parameters, providing re-training functionality through the existing USB protocol framework without adding significant complexity.
Data Source
AI summary
A transmission unit, receiving unit, active transmission device and active transmission system applicable to USB signal, and is used for addressing the problem that the ping.LFPS signal is easy to lose; setting a detection threshold value to distinguish ping.LFPS signals from other LFPS signals to ensure that no ping.LFPS signals are missed; optimizing the USB3.X signal with a proxy module to generate proxy signals for ping.LFPS signals and other LFPS signals respectively; supporting and managing the Link training to improve the success rate of high-speed signal transmission by modifying circuit configuration and re-training.