CAUI-4 Variations of the LL 100GbE IP Core Do Not Support Serial PMA Loopback Mode - CAUI-4 Variations of the LL 100GbE IP Core Do Not Support Serial PMA Loopback Mode Description CAUI-4 variations of the LL 100GbE IP core do not support serial PMA loopback mode. If you set any bits in the PHY_PMA_SLOOP register at offset 0x313 in your CAUI-4 variation, the change has no effect. Resolution This issue has no workaround This issue will be fixed in a future version of the Low Latency 40- and 100-Gbps Ethernet MAC and PHY IP core. Custom Fields values: ['novalue'] Troubleshooting novalue True ['Ethernet'] ['FPGA Dev Tools Quartus® Prime Software Pro'] novalue 15.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']