The following figure shows a system where the PCIe to AXI4-Lite Master (BAR0) and PCIe to DMA Bypass (BAR2) are selected. 4K block RAM is connected to the PCIe to DMA Bypass interfaces. The host can use DMA Bypass interface to read/write data to the user space using the AXI4 MM interface. This interface bypasses DMA engines. The host can also use the PCIe to AXI4-Lite Master (BAR0 address space) to write/read user logic. The example design connects 4K block RAM to the PCIe to AXI4-Lite Master interface so the user application can perform read/writes.
Figure 1. AXI-MM Example with PCIe to DMA Bypass Interface and PCIe to AXI-Lite Master Enabled