Why do I receive incorrect data returned from my read TLP requests on my Intel® Avalon®-Memory Mapped 128 bit Hard IP for PCI* Express? - Why do I receive incorrect data returned from my read TLP requests on my Intel® Avalon®-Memory Mapped 128 bit Hard IP for PCI* Express? Description Due to a problem with the Intel® Quartus® II and Prime software versions 15.0, 16.0, 16.1, 17.0 and 17.1 you may see incorrect read data when the PCI* Express link is highly utilized and there are a lot of out-of-order completions. This problem only occurs for PCI* Express Hard IP Avalon®-Memory Mapped 128 bit variants. When this happens, parts of data from incoming reads may appear in the middle of data from a previous read. Resolution This problem is caused by the memory holding the completion buffer being sized too small. To workaround this issue follow these steps: Look in the generated file directories for the file altpciexpav128_rx.v . Find the line localparam CB_RX_CPL_BUFFER_DEPTH =256; Change the line to localparam CB_RX_CPL_BUFFER_DEPTH =512; Find the lines “wire[7:0] cplram_wraddr; ” and “wire [7:0] cplram_rdaddr;” Change the wire width from 8-bit to 9-bit: wire [8:0] cplram_wraddr; wire [8:0] cplram_rdaddr; ” Version Found: 15.0 and 16.0 to 17.1.1 Version Fixed: 15.1 and 18.0 This issue has been fixed starting in software version 18.0. Custom Fields values: ['novalue'] Troubleshooting FB: 539496; False ['Avalon-MM Arria® V GZ Hard IP for PCI Express IP', 'Avalon-MM Arria® V Hard IP for PCI Express IP', 'Avalon-MM Cyclone® V Hard IP for PCI Express IP', 'Avalon-MM Stratix® V Hard IP for PCI Express IP', 'Arria® 10 Cyclone® 10 Hard IP for PCI Express'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 18.0 15.0 ['Arria® V GT FPGA', 'Arria® V GX FPGA', 'Arria® V GZ FPGA', 'Arria® V ST FPGA', 'Arria® V SX FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA', 'Arria® 10 GT FPGA', 'Arria® 10 GX FPGA', 'Arria® 10 SX FPGA', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']