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Avionics full duplex switched Ethernet (AFDX) is the next generation avionics system backbone network connection,ARINC429 is a more mature bus standard in the avionics system field, in some system is still used.How to achieve the transformation of two bus is one of the key technology of avionics system.Using design of AFDX protocol and ARINC429 protocol IP core, completed two bus protocol conversion to each other.Parsing out 429 data word from AFDX data frames, or add 429 data word to the AFDF protocol of each layer header AFDX frames.By Modelsim SE the RTL simulation and FPGA physical test, the results show that AFDX protocol frame and ARINC429 data word can convert each other, to verify the correctness of the IP core and bus conversion interface design.