AS5643 high speed serial bus is proposed to meet the realtime high speed data transmission application requirements in aviation aircraft building upon the foundation of IEEE 1394b protocol which ameliorates and enhances its realtime capability, certainty, reliability and message delivery mechanism. To promote the application of AS5643 technology, a study is conduct on AS5643 protocol to design the AS5643 LLC IP core transmission node conformed to the protocol based on FPGA. We build an integrated system with several nodes to validate the functions and performances of AS5643 node by using the test equipment to monitor and analyse the transactions on the serial bus. The experiment and test results show that this AS5643 LLC IP core conforms with AS5643 protocol which can achieve reliable high bandwidth of data transfer in the aeronautic application field.