Outstanding Non-Posted Requests

The AXI slave read and write interfaces (I/O and configuration requests in root port mode). can send non-posted requests. The client should ensure that the sum of outstanding non-posted requests over the two AXI slave interfaces is less than the maximum number of outstanding non-posted requests that can be handled by the PCIe Controller's split completion table.

Note: The PCIe Controller back pressures the AXI slave interface in case the number of non-posted requests exceeds the maximum that it can handle, which affects performance.