A Deep Dive into AMD/Xilinx AXI Bridge for PCI Express (AMD/Xilinx PG194) and Why We Tweaked C_M_AXI_NUM_READQ Executive Summary AMD/Xilinx’ AXI Bridge for PCI Express (PG194) implements a bi-directional communication channel from and to FPGA internal memory mapped AXI4 masters and slaves to and from external PCIe connected memory mapped devices, with the FPGA operating as PCIe endpoint or root port. In many scenarios the performance of forwarding communication between the two protocols, AXI4 and PCIe, is sufficient and the AMD/Xilinx IP core can be used as well. However, in certain cases tweaking is necessary to achieve the expected throughput. Depending on the amount of extra performance required the modification ranges from simply tuning a hidden parameter to patching the IP’s HDL sources. In the example project used for this description the PCIe peer to peer (P2P) write performance from an FPGA to a 12 NVMe SSD RAID0 increased from 2.700 MiB/s to 4.900 MiB/s to 8.600 MiB/s. AMD/Xilinx AXI Bridge for PCI Express Overview The AMD/Xilinx AXI Bridge for PCI Express is implemented differently for different AMD/Xilinx FPGA families. This description focuses on the “AMD/Xilinx DMA//Bridge Subsystem for PCI Express in AXI Bridge mode” implementation as found in AMD/Xilinx UltraScale+ devices. The bridge IP core comprises the actual bridging logic, converting

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