USB Signal Transmission Device Direction Detection
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Solution Overview
Problem
In USB signal transmission, determining the correct transmission direction between devices operating in DisplayPort alternate mode is challenging, especially when using USB repeaters to extend data transmission distance, as existing solutions lack efficient methods to detect and adjust signal flow accordingly.
Innovation Solution
A USB signal transmission device comprising a signal processing circuit, a switch circuit, and a control circuit that detects the signal flow during a detection period and adjusts the transmission direction based on the detection results, ensuring proper data flow between USB circuits, even when operating in DisplayPort alternate mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If USB repeater is used to extend data transmission distance, then transmission distance is improved, but difficulty of detecting and measuring transmission direction increases
Solution Approach 1:
The control circuit performs detection during a detection period before normal data transmission begins. The switch circuit is turned off during this detection period to enable the control circuit to detect the transmission direction by monitoring signal flow on the differential pin pair, establishing the correct transmission direction before actual data transmission starts.
Solution Approach 2:
The control circuit continuously monitors the signal flow during the detection period and uses this feedback information to determine the transmission direction. Based on the detection results, the control circuit adjusts the switch circuit state to configure the signal processing circuit for bidirectional or unidirectional transmission, ensuring correct signal routing.
2Measurement precision
If switch circuit is turned off during detection period, then transmission direction can be detected, but data transmission is interrupted
Solution Approach 1:
The detection of transmission direction is performed during a detection period before normal data transmission begins. This preliminary detection ensures that the transmission direction is correctly identified and the switch circuit is properly configured before actual data transmission starts, avoiding interruptions during productive transmission.
Solution Approach 2:
The system operates in periodic cycles: during the detection period, the switch circuit is turned off to enable transmission direction detection; during the normal transmission period, the switch circuit is turned on to enable data transmission. This periodic switching between detection and transmission modes allows both functions to be performed without conflict.
Data Source
AI summary
A universal serial bus (USB) signal transmission device, an operation method thereof, and a USB cable are provided. The USB signal transmission device includes a signal processing circuit, a switch circuit, and a control circuit. A first terminal of the switch circuit is coupled to a first USB circuit. A second terminal of the switch circuit is coupled to a second USB circuit. The control circuit turns off the switch circuit during a detection period to detect both terminals of the switch circuit to obtain a detection result. The control circuit turns on the switch circuit during a transmission period, and controls a transmission direction of the signal processing circuit according to the detection result.