eUSB2 Protocol Low Power Physical Layer Design
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Solution Overview
Problem
The standard USB2 protocol faces integration challenges due to high voltage requirements and high power consumption, making it unsuitable for devices with stringent I/O power consumption specifications, such as mobile platforms.
Innovation Solution
The eUSB2 protocol employs lower signal voltage and reduced power consumption through simplified physical layer architecture, using 1 Volt CMOS circuitry for digital communication, eliminating analog components, and implementing a device ping for idle mode detection to reduce power consumption, while supporting Low-Speed, Full-Speed, and High-Speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard USB2 protocol uses 3.3 Volt signaling, then communication reliability is maintained, but power consumption increases and integration becomes difficult in advanced semiconductor processes
Solution Approach 1:
The patent changes the voltage parameter from 3.3V to 1.0V signaling level, enabling operation in advanced CMOS processes while maintaining communication functionality. This parameter change directly reduces power consumption and enables integration in modern semiconductor fabrication processes that cannot tolerate 3.3V gate oxide voltages.
2Adaptability or versatility
If standard USB2 protocol uses 3.3 Volt signaling, then communication compatibility is ensured, but integration complexity increases due to gate oxide voltage limitations
Solution Approach 1:
The voltage level parameter is changed from 3.3V to 1.0V, allowing direct integration with advanced CMOS processes without requiring special high-voltage transistors or complex voltage translation circuits. This simplifies the overall system integration while maintaining USB 2.0 protocol compatibility.
3Adaptability or versatility
If standard USB2 protocol is used, then widespread device support is achieved, but power consumption is too high for mobile platforms
Solution Approach 1:
The signaling voltage is reduced from 3.3V to 1.0V, which directly reduces dynamic power consumption (P ∝ CV²f). This enables USB communication to be used in mobile and battery-powered devices where power consumption is a critical constraint, while still maintaining full USB 2.0 protocol support and device compatibility.
4Reliability
If analog components are used in USB2 physical layer, then signal integrity is maintained, but device complexity and power consumption increase
Solution Approach 1:
The patent replaces analog physical layer components with fully digital implementation. By using 1.0V CMOS digital logic to implement USB 2.0 encoding and decoding, the design eliminates analog signal conditioning circuits, operational amplifiers, and other analog components, thereby reducing device complexity and power consumption while maintaining signal integrity through robust digital signaling.
Data Source
AI summary
Systems and method for operating a low power universal serial bus are described herein. A universal serial bus port includes a link layer and protocol layer that are compatible with a standard USB2 protocol. The link layer and protocol layer to control a physical layer for transmitting and receiving data on a pair of signal lines. The physical layer includes a fully-digital Low-Speed/Full-Speed (LS/FS) transceiver to transmit and receive data on the pair signal lines using single-ended digital communications on the pair of signal lines.