The top level Verilog file for krnl_aurora is located at ./rtl/krnl_aurora.v. While instantiates Aurora IP, AXI stream data FIFO IP and AXI control slave module, the top module inserts CDC module between Aurora IP and AXI control slave, which work in different domain. The top module also generates reset_pb and pma_init signals for Aurora IP. Refer to the documents of Aurora 64B/66B IP for more details.