Research And Design Of High-speed Serial Optical Interconnect System For Multi-FPGA Devices

With the rapid development of information technology,various applications of big data are constantly emerging,leading to explosive growth in the demand for communication bandwidth between chips.Traditional multi-chip systems generally use parallel electrical interconnections.However,in the face of the rapid growth of communication bandwidth,this interconnection has several shortcomings.First,parallel interconnections need to consume a large number of input and output(IO)ports or pins.Under the requirements of complex systems,it may even exceed the total number of IO pins of the chip.Secondly,multipath parallel lines are prone to signal integrity problems such as crosstalk between lines during high-bandwidth transmission,which limits the further improvement of transmission bandwidth.The electrical interconnection has a relatively large loss during the transmission between the chips,resulting in a limited transmission distance.In view of the above problems,this paper proposes a design method of a high-speed serial optical interconnect system for multiple FPGA(Field Programmable Gate Array)devices.The system uses high-speed serial transmission and optical interconnection interfaces,and uses serial interconnection technology to achieve high-bandwidth communication between multiple chips,improving the bandwidth and performance of data transmission.Based on the system functions and main technical indicators,this paper first considers the interconnection structure,communication protocol,and interface chip characteristics,and completes the design of the overall structure of the system.It realizes multiple FPGA devices with multiple paths,high bandwidth,and flexible switching interconnection structure.In order to achieve high-speed and reliable data transmission,this paper further completes the construction of interconnect links with the help of high-speed serial and optical interconnect interfaces,and realizes the link design,clock distribution,and multi-link data of high-speed single-channel interconnect,multi-channel interconnect,and high-speed transfer interconnect synchronous design to ensure that the corresponding indicators of the transmission link meet the system requirements.Based on the system structure and link design,this paper builds a hardware platform based on high-speed serial optical interconnection.Through the discussion of key circuits such as the power supply system,configuration system,storage system,and optical interface circuit,combined with plate selection and highspeed PCB(Printed Circuit Board)design,a high-speed serial optical interconnection hardware system platform composed of 5 FPGA devices was realized,which verified that this article presents the validity and rationality of the method and design.The function and performance tests of the designed system are carried out in this paper.The experimental results show that the high-speed serial optical interconnect system for multi-FPGA devices proposed in this paper is based on indicators such as total throughput,single-channel transmission rate,and transmission error rate.All meet the system design requirements,and can achieve high-bandwidth information transmission between multiple chips while occupying fewer chip pin resources.The design proposed in this paper has certain reference significance for the future multi-chip communication system design.