| As digital information technology continues to rapidly advance,the bandwidth requirements for high-speed bus interfaces in hardware device are increasing.The USB-IF oragnization continually updates its interface pr otocol standards,with the USB specification having advanced to USB4.0,offering data transfer speeds of up to 40Gbps.USB4.0 protocol supports the DP,PCIE and USB multi-protocol data transmission simultaneously and each subsystem has independt bandwidth management mechanism.For USB3 tunneling protocol transfers,there is currently a lack of efficient software and hardware coordination mechanisms for managing USB4 bandwidth and USB3 tunneling protocol bandwidth.The paper addresses these issues and conducts an indepth research on the bandwidth management mechanism of the USB3 tunneling protocol.Based on the requirements of the USB4 Connection Manager specification,USB4.0 specification and USB3.2 specification,combined with the bandwidth management mechanism of USB3 tunneling protocol,the paper completes the design of the bandwidth management circuit for USB3 tunneling protocol and performs power consumption simulation.Then proposes a lowpower bandwidth management mechanism based on the power analysis and completes the optimized design.and finally performs system functional verification and power simulation of the optimized design.The details are as follows:Firstly,the paper analyzes the bandwidth negotiation mechanism in USB3 tunneling.Based on the operating mechanism of the USB4 Connection Manager,USB4 Host and USB3 Host,and constructs a communication mode for the bandwidth information of the USB3 tunneling protocol.The bandwidth management circuit design scheme forUSB3 tunneling protocol is proposed,which achieves the exchange of bandwidth information betweenUSB3 and USB4 systems.Then,this design is simulated for power consumption and results are analyzed,which provides design ideas for subsequent power optimization.Secondly,the paper delves into the sources of power consumption of the above circuit and the power consumption requirements and characteristics of SoC.Based on the multi-level power management system,A non-active wake-up bandwidth management strategy is proposed,and the design of low power bandwidth management circuit for USB3 tunneling protocol is completed.The paper adopts power gating technology,allowing the bandwidth management system to process bandwidth management event while USB3 Host Controller is in hibernation mode,thereby reducing power consumption and latency associated with processing bandwidth management event.Finally,a simulation verification platform was built to complete system-level functional verification and power simulation.The optimized design reduces total power consumption by 60.1%in hibernation mode compared to idle mode before optimization.Moreover,with USB4 Connection Manager processing bandwidth management event,it no longer needs to wait for the USB3 Host Controller to wake up,enabling real-time communication. |
