Write Transaction Ordering

On the outbound direction, the PCIe Controller is in cut-through mode. That is, there are no store and forward buffers and TLPs flow out to the link strictly in the order they were received from the AXI slave interface. TLPs go out on the link in the same order they were accepted on the AXI slave write interface, whether the writes are posted or non-posted or whether they have the same MASTER_AXI_AWID or different. This process ensures PCIe ordering rule compliance.