Design And Implementation Of HDMI Receiver Multimedia Interface Subsystem With 8K Resolotion

The multimedia high-speed interface is a critical technology as the development of ultra-highdefinition display.It's necessary of HDMI(High Definition Multimedia Interface)to transmit and protect 8K data,meanwhile,to reduce the cumbersome operation of various HDMI devices.Whereas only a few foreign enterprises and research institutions had some prominent results,to cover the shortage of the domestic research,this thesis designed three modules based on the HDMI 2.1 protocol:FRL(Fixed Rate Link),HDCP(High-Bandwidth Digital Content Protection),and CEC(Consumer Electronic Control).The thesis began with the analysis of the FRL link training process,and made a brief overview of the application of the video compression algorithm DSC(Display Stream Compression)in the HDMI system.Simultaneously,HDCP 2.2 protocol was analyzed from the aspects of authentication,encryption and authentication state jump,and CEC 1.4 protocol was analyzed from the aspects of timing,message frame and functional characteristics respectively.Based on the previous analysis,three modules were systematically designed and implemented.For the FRL module,the FSM(Finite State Machine)was utlized for the realization of the link training process,and a DSC software scheme was provided.For the HDCP module,the control and authentication systems were completed separately by the multi-core CPU and 8051 MCU working in cooperation.Furthermore,to achieve the purpose of authentication,some methods such as FSM jumping and DMA private key transportting are used in the reasonably schedule of MCU.For the CEC module,the cooperation of the CPU and the MCU suffice for the low power consumption of the system.Ultimately,the CTS(Compliance Test Specification)test and functional verification of all modules were completed on the existing So C system platform loaded the HDMI RX driver.The test result indicated a significant decrease of the black screen time of the TV from 2-3 s to less than 500 ms during the multi-HDMI port switching,and the stable ability of 8K 60 frames transmission.For HDCP and CEC,the CTS of the SL-8800 and SL-309 instruments passed respectively,and verified the feasibility of the system scheme of three modules by docking with the equipment of mainstream manufacturers.There is no doubt that the HDMI is a crucial technology in ultra-high-definition video transmission.The implementation of the HDMI RX software scheme in this thesis can give a valuable guide to 8K transmission,audio and video protection for domestic enterprise.