USB-C Orientation Detection Using SBU Signals During Early Boot
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Solution Overview
Problem
The Universal Serial Bus Type-C (USB-C) specification limits debug operations and orientation identification due to the unavailability of power management circuitry during the early boot phase, hindering incremental improvements in speed and power efficiency.
Innovation Solution
The implementation of a system that uses signal types other than those specified for orientation identification, such as sideband use (SBU) and configuration channel (CC) signals, to determine the connection orientation, even when power management circuitry is unavailable, by configuring communication modes through cross-bar switches and detector circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the USB-C specification uses only specified signal types (CC pins) for orientation identification, then the orientation detection follows the standard protocol, but debug operations and orientation identification are limited during early boot phase when power management circuitry is unavailable
Solution Approach 1:
The patent repurposes sideband use (SBU) signals, originally intended for audio grounds, to serve dual functions: maintaining audio functionality and enabling orientation identification during early boot phase. This multi-functionality allows the system to overcome USB-C specification limitations without adding dedicated orientation detection hardware.
Solution Approach 2:
The patent introduces detector circuitry that acts as an intermediary between the SBU signals and the orientation identification logic. This intermediary component detects signal characteristics on SBU pins and translates them into orientation information, enabling debug operations without requiring power management circuitry to be available.
2Reliability
If the system waits for power management circuitry to become available before performing orientation identification, then the standard USB-C protocol is followed, but speed and power efficiency are reduced
Solution Approach 1:
The patent performs orientation identification using SBU signals during the early boot phase, before power management circuitry becomes available. By executing this action preliminarily, the system establishes communication mode earlier, improving boot speed and power efficiency while maintaining protocol compliance through proper signal interpretation.
3Productivity
If the system uses additional signal types beyond CC pins for orientation identification, then orientation detection can proceed during early boot phase, but the system complexity increases
Solution Approach 1:
The patent leverages existing SBU signal infrastructure and its inherent electrical characteristics to perform orientation identification. The SBU signals themselves provide the necessary information through their signal characteristics, eliminating the need for additional dedicated orientation detection hardware and keeping the system relatively simple.
4Use of energy by moving object
If the system adapts communication modes based on detected signal characteristics, then power efficiency and speed are enhanced, but the control system complexity increases
Solution Approach 1:
The patent implements dynamic adaptation of communication modes based on detected SBU signal characteristics. The system transitions between different communication configurations (such as switching which pins serve which functions) depending on the detected orientation, enabling power efficiency and speed improvements through context-aware resource allocation.
Data Source
AI summary
Techniques and mechanisms for determining an orientation of a connection to an input and/or output (IO) interface of a device. In an embodiment, the device receives one or more signals, each via a respective contact of the IO interface, and identifies the orientation based a signal characteristic of the one or more signals. A communication mode of the device is then configured to accommodate the orientation. A physical arrangement of the IO interface is compatible with a signal plan of an interface type which is defined by an interface specification. The one or more signals are each of a respective signal type other than any signal type which, according to the interface specification, is to provide a basis for orientation identification. In some embodiments, the interface specification is a USB-C specification.