SPRUHZ7K August 2015 – April 2024 AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL
I/O traffic is not symmetrical: it can only be requested by the RC, and responded to by the EP. It is a mostly deprecated feature of PCI, and could be replaced by Memory traffic. However, it is still required by the standard for a PCIe RC. It is supported by the current controller in both RC (requester) and legacy EP mode (completer).