Dynamic USB IO Buffer Signal Strength Control
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Solution Overview
Problem
Existing USB devices face issues with excessive signal strength during communication in both host and device modes, leading to problems with USB connection and data communication recognition.
Innovation Solution
An electronic device and method that detect the connection with an external device upon booting, determine the mode, and adjust the IO buffer's characteristic settings to vary signal strength accordingly, allowing optimal performance by communicating signals at strengths specific to each mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic device uses fixed signal strength for USB communication in both host and device modes, then the device structure remains simple, but the USB connection reliability deteriorates due to excessive signal strength causing recognition problems
Solution Approach 1:
The patent implements dynamic signal strength adjustment by detecting the USB connection mode (host or device mode) and automatically varying the IO buffer characteristic settings accordingly. The controller changes the signal strength parameter based on the operational mode, transforming the fixed signal strength system into a dynamic one that adapts to different connection scenarios, thereby resolving the contradiction between connection reliability and system simplicity
Solution Approach 2:
The patent changes the signal strength parameter of the IO buffer based on the detected USB mode. When host mode is detected, one signal strength setting is applied; when device mode is detected, a different signal strength setting is applied. This parameter change approach allows the system to optimize USB connection reliability for each mode without requiring complex hardware modifications, effectively resolving the technical contradiction
2Productivity
If the electronic device adjusts IO buffer settings to optimize signal strength for each mode, then USB communication performance improves, but the device complexity increases due to mode detection and dynamic adjustment mechanisms
Solution Approach 1:
The USB controller automatically detects the connection mode and self-adjusts the IO buffer signal strength settings without requiring external intervention or complex control logic. The system serves itself by monitoring its own operational state and making appropriate parameter adjustments, thereby improving data transfer efficiency while minimizing the increase in device complexity
Solution Approach 2:
The patent implements a feedback mechanism where the controller detects the USB connection mode and uses this information to adjust the signal strength parameters. The detection result feeds back to the IO buffer configuration, creating a closed-loop control system that optimizes communication performance based on actual operational conditions, balancing productivity improvement with controlled complexity
3Reliability
If the electronic device uses default signal strength settings during booting, then the booting process remains fast and simple, but the initial USB connection reliability is poor due to incorrect signal strength for the detected mode
Solution Approach 1:
The patent performs preliminary mode detection during the booting process itself, before normal USB communication begins. The controller detects the USB connection mode early in the initialization sequence and pre-configures the appropriate signal strength settings for the IO buffer. This preliminary action ensures that the correct signal strength is established before any USB data transfer attempts, improving initial connection reliability without significantly extending booting time
Data Source
AI summary
An electronic device and a method for changing modes according to external devices connected through a universal serial bus (USB) and controlling the strength of signals communicated according to changed modes are provided. The method includes detecting a connection with an external device corresponding to booting of the electronic device, determining a mode of the electronic device according to the detected connection with the external device, varying a characteristic setting of an input output (IO) buffer to a certain strength corresponding to the determined mode, and communicating a signal at a strength corresponding to the varied setting.