Research On Key Technologies Of High Speed Data Transmission System Based On USB3.0

Video source images need to be transmitted when they are displayed on a transmission medium or relayed.As their resolution and real-time performance continue to increase and increase,the requirements for transmission capacity and bandwidth are constantly increasing.Compared with the existing high-speed transmission methods of video images,such as PCI-E,eSATA,and USB,the method of transmitting data using the USB interface has strong advantages in terms of bandwidth,portability,etc.,and its continuous development and application have also become researched.Focus.Since the birth of USB,various standards such as USB1.0,USB1.1,USB2.0 to USB3.0 have existed.Among them,the USB3.0 standard has the highest transmission speed,which is 5Gbps,and is backward compatible.In the research field of application,the USB3.0 implementation technology mainly includes FPGA+USB3.0 physical layer chip and DSP chip integrated with USB3.0 module.For comparison,based on the requirements of the subject,the first method is adopted.This topic is based on the USB3.0 standard,and it has been deeply studied and explored for its application in high-speed data transmission.The work done in this paper is summarized as follows:(1)Comparing various USB transmission methods,analyzing the advantages and disadvantages,and presenting a scheme of USB3.0 high-definition video transmission system based on FPGA,using FPGA to mount the USB3.0 physical layer chip;(2)A system circuit was designed to debug and solve the problems in the hardware circuit;a video format recognition and encoding module,a color space conversion module,an SDRAM control logic,and a USB3.0 control state machine were written based on verilog language.Simulation;(3)Using USB3.0 firmware program framework,combined with the characteristics of high-definition video transmission,configure and compile the Stream_IN.img firmware for this topic;(4)Simulated testing of the transmission system and sending of high-definition video test system using a desktop analog HD video source with DVI interface.The test results show that the HD video transmission system designed in this project can transmit video data at a stable rate of 320 MB/s.The innovations in this article are as follows:(1)Real-time transmission of high-definition video,transmission speed up to 320MB/s;(2)The method of inserting format information and synchronization code into an HD video stream enables the video stream to be transmitted to the PC in a frame-aligned manner to ensure the completeness of the video image received by the PC.(3)High-speed and high-efficiency SDRAM chips are used in conjunction with the FPGA to control state machines to cache video image data.