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Sorry for the delay in the response. Digging further on your question, the address space 0x70000000 is corresponding to MSRAM_256K0_RAM in the Table 2-1 of TRM. My understanding is that the ATU space is mapped to this RAM in the PCIe example you pointed out. I believe this address can vary based on the implementation of the software. Please let me know if this answers your question.
