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In view of the application about BAC time node in the PCIe computer system, Based on the PCIe endpoint hard core and BAC conversion with code parsing , a BAC time node design is implemented.The overall circuit of the node is realized,which is including BAC input signal linear isolation circuit, hysteresis comparison output circuit for BAC signal sampling ,and A / D conversio n acquisition circuit.FIFO storage and PCIe endpoint are also realized based on ALTERA FPGA. The node has simple composition and Good applicability through linear isolation and FPGA integration design about PCIe,FIFO and control logic.