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two AM3874 how to communicate with each other ,i want to use the PCIe to conenect each other

Other Parts Discussed in Thread: AM3874

We want to desigen  a CNC machine control board,and  on the product board  ,we want to use two AM3874 ,between the two AM3874 they have high rate of data to  exchange . So I want to use the PCIe to connect each other .If I don't use the PCIe ,I can use what  interface  to connect the two AM3874 to exchange the data ?