Research On Adaptive Interface Transmission Technology For Software Defined Interconnection

With the accelerated development of the digital age,the world is defined by software and everything can be connected,which promotes the development of information infrastructure with data center,high-performance computing,wireless base station,cloud computing and other core to the direction of efficient and flexible interconnection.In order to meet this requirement,information infrastructure generally introduces heterogeneous processing and a variety of interconnection ways to realize the interconnection between heterogeneous protocols,and adopts software definition technology on the protocol interconnection layer to improve the flexibility and expansibility of information system.However,the software definition technology limited to the protocol layer has not solved the rigid structure of protocol interconnection.The Software Defined Interconnection(SDI)enables software definition of interconnection protocols,ports,and interconnection modes at the hardware level,thereby breaking the current rigid interconnection structure and expanding the efficiency and flexibility of information systems from the architecture.As a physical layer transmission technology for SDI,SerDes(Serializer/Deserializer)must support interconnection of heterogeneous protocols to meet the flexibility and robustness requirements of this interconnection structure.However,existing SerDes devices use pre-configured adaptive design,or only consider adaptive equalization for a single protocol,without considering multi-frequency adaptive equalization or self-negotiation mechanisms for heterogeneous protocols,making it difficult to meet the requirements for interconnection of heterogeneous protocols.In view of this,this paper optimizes the adaptive decision feedback equalizer(DFE)to improve the maximum equalization compensation ability of the link,given that the receiver’s equalization is difficult to adapt to the equalization compensation ability under multi-frequency.A transmitter adaptive feed-forward equalization control circuit is designed since fixed or pre-set equalization parameters are difficult to achieve the desired pre-emphasis effect.Additionally,a comparative decision-based self-negotiation mechanism is proposed to address the difficulty in achieving plug-and-play for different types of protocol physical interfaces in existing multi-protocol high-speed serial interface transmission circuits.The specific research contents of this thesis are as follows:1.A self-adaptive DFE circuit structure based on the sign-sign least mean square(SS-LMS)algorithm is proposed.Aiming at the power consumption and area overhead of the DFE circuit under the multi-protocol transmission requirements of the existing SS-LMS algorithm,this paper optimizes the adaptive compensation circuit of the DFE circuit by optimizing the Slicer and integral circuit to reduce the additional introduction of standard data.Simulation results show that the DFE circuit designed in this paper has better adaptive compensation ability under the33 d B insertion loss channel model.The test results show that the overall power consumption is optimized by 16% compared with the existing related literature schemes.2.A transmitter adaptive feedforward equalization design scheme is proposed.Aiming at the problem that the feedforward equalization circuit of the transmitter cannot meet the adaptive adjustment of the equalization coefficient under heterogeneous protocol transmission by manually adjusting or configuring the tap parameters in advance,a feedforward equalization control circuit was added between the protocol controller and SerDes IP to complete the calculation and update of the instructions in the training sequence,and the adaptive dynamic adjustment of the feedforward equalization circuit’s tap coefficient was realized.Experimental results show that the scheme can adaptively correct the tap coefficient,increase the horizontal and vertical eye opening by 8% and 30%,and effectively reduce the bit error rate.3.A game-theoretic self-negotiation mechanism for physical layer protocols is proposed.Aiming at the problem that multi-protocol interface cannot be plug-and-play in software defined interconnection system,the corresponding game model is constructed through mathematical induction and analysis,and then a self-negotiation mechanism of comparison and judgment is proposed to realize the negotiation communication between heterogeneous protocols.Experimental results show that the mechanism can effectively solve the multi-protocol high-speed interface circuit does not take the initiative to configure its interface protocol when communicating,but still can establish interconnection with the peer,and reduce the negotiation time by 80% at most.