eUSB2 Polarity Inversion Detection via Control Messages
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Solution Overview
Problem
The existing Universal Serial Bus 2.0 (USB2) protocol does not define signaling for detection of polarity inversion at eUSB2 data lines, which is essential for maintaining communication efficiency and compatibility in embedded applications.
Innovation Solution
The implementation of explicit control messages and extended single-ended signaling mechanisms allows for in-band communication to manage link power states, detect polarity inversion, and avoid bus conflicts, using eUSB2 repeaters to differentiate between suspend and reset states without additional sideband signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If eUSB2 employs NRZ signaling without line code, then power consumption is reduced and simplicity is improved, but polarity inversion detection capability deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism (control messages with explicit polarity indicators) that mediates between the simple NRZ signaling and the need for polarity inversion detection. The control messages carry explicit polarity information without requiring complex line coding, thus maintaining low power consumption while enabling reliable polarity detection.
2Reliability
If explicit control messages are implemented for polarity detection, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges polarity detection functionality with existing control message structures in the eUSB2 protocol. By combining multiple functions (polarity indication, control signaling) into unified control messages, the patent avoids adding separate detection mechanisms, thus improving reliability while minimizing increases in device complexity.
3Device complexity
If in-band communication is used for power state management, then additional sideband signaling is eliminated, but bus conflict risk increases
Solution Approach 1:
The patent implements dynamic protocols for in-band communication that adaptively manage bus access and timing. By using dynamic timing mechanisms and state-dependent signaling, the patent enables power state management over the same data lines without creating bus conflicts, as the protocol dynamically coordinates transmissions to avoid collisions.
4Reliability
If eUSB2 repeaters are used to differentiate suspend and reset states, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having eUSB2 repeaters pre-process and differentiate between suspend and reset states before forwarding signals. The repeaters use preliminary state detection and classification mechanisms to identify and handle different control states, improving communication reliability while keeping processing complexity manageable through early differentiation.
Data Source
AI summary
Techniques for embedded high speed serial interface methods are described herein. The method includes issuing a single-ended one (SE1) signal on each of a pair of embedded high speed serial interface data lines, the SE1 indicating a register access protocol (RAP) message follows the SE1 signal. The method also includes accessing a register of an embedded high speed serial interface component based on the RAP message.