Interface Conversion Device for USB 4.0 and DisplayPort AUX Compliance
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Solution Overview
Problem
Existing interface conversion devices struggle to maintain compatibility with different transmission interfaces, such as USB and DisplayPort, particularly when operating in various modes like USB 4.0 and ALT mode, as they need to process signals that may not be compliant with the DisplayPort specification.
Innovation Solution
A chip and interface conversion device with specific pad configurations and capacitors that allow the AUX channel pins of the DisplayPort connector to be compliant with the DisplayPort specification in different modes by selectively transmitting and receiving signals, and adjusting voltage levels accordingly, enabling seamless conversion between USB and DisplayPort interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interface conversion device processes signals from USB 4.0 mode, then USB 4.0 compatibility is improved, but the AUX channel signal compliance with DisplayPort specification deteriorates
Solution Approach 1:
The pad configuration dynamically changes based on operating mode. In USB 4.0 mode, the fourth pad and sixth pad are configured with weak pull-down and weak pull-up respectively, while in ALT mode, they connect to SBU pins. This dynamic reconfiguration allows the same hardware to comply with different signal specifications in different modes.
Solution Approach 2:
The electrical characteristics of the pads are changed based on operating mode. The fourth pad transitions from weak pull-down in USB 4.0 mode to connection with SBU pin in ALT mode, and the sixth pad transitions from weak pull-up in USB 4.0 mode to connection with SBU pin in ALT mode. This parameter change ensures signal compliance in both modes.
2Adaptability or versatility
If the interface conversion device processes signals from ALT mode, then ALT mode compatibility is improved, but the AUX channel signal compliance with DisplayPort specification deteriorates
Solution Approach 1:
The pad configuration dynamically changes based on operating mode. In ALT mode, the fourth pad connects to the first SBU pin and the sixth pad connects to the second SBU pin, allowing proper AUX channel signal transmission compliant with DisplayPort specification.
Solution Approach 2:
The electrical characteristics of the pads are changed based on operating mode. In ALT mode, the fourth pad connects to SBU pin (first terminal of first capacitor) and the sixth pad connects to SBU pin (second terminal of second capacitor), ensuring signal compliance.
3Adaptability or versatility
If the fourth pad and sixth pad are configured with weak pull-down and weak pull-up in USB 4.0 mode, then USB 4.0 signal processing is improved, but the AUX channel pin compliance with DisplayPort specification deteriorates
Solution Approach 1:
The pad configuration is dynamic and mode-dependent. In USB 4.0 mode, the fourth pad has weak pull-down and the sixth pad has weak pull-up. In ALT mode, these pads connect to SBU pins. This dynamic behavior resolves the contradiction by adapting to different mode requirements.
4Device complexity
If the interface conversion device uses a fixed pad configuration, then device complexity is reduced, but compatibility with different transmission interfaces deteriorates
Solution Approach 1:
The pad configuration is made dynamic through mode-dependent switching. The system detects the operating mode (USB 4.0 or ALT) and automatically configures the pads accordingly, providing multi-interface compatibility without requiring multiple fixed configurations or complex manual switching.
Data Source
AI summary
A chip and an interface conversion device are provided. The chip includes first, second, third, fourth, fifth and sixth pads. The first and second pads are coupled to first and second SBU pins of a USB connector respectively. The fourth and the sixth pads are coupled to first and second pins of an AUX channel of a DP connector respectively. When the chip operates in a first mode, first and second AUX channel signals generated by the chip are transmitted to the third and fifth pads respectively, a voltage of the fourth pad is weakly pulled down, and a voltage of the sixth pad is weakly pulled up. When the chip operates in a second mode, one of the first and second pads is connected to the fourth pad, and the other one of the first and second pads is connected to the sixth pad.