Why does the LL 40GBASE-KR4 IP Core intermittently fail Auto-Negotiation and thus fails to link up? - Why does the LL 40GBASE-KR4 IP Core intermittently fail Auto-Negotiation and thus fails to link up? Description Due to a problem with the Low Latency 40GBASE-KR4 IP core, link training will fail, rx_pcs_ready will not be asserted, and register 0xB1 will return the value of 0x100. This indicates that the IP core is stuck in Auto-Negotiation mode. The problem is in hardware only and does not exhibit in simulation. This is a start-up only problem, if rx_pcs_ready asserts the IP Core will continue to work correctly. Resolution The problem is fixed beginning with the Quartus® Prime software version 16.0 update 1. Custom Fields values: ['novalue'] Troubleshooting FB: 367061; False ['Low Latency 40G 100G Ethernet'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 16.0.1 14.1 ['Arria® 10 FPGAs and SoCs', 'Arria® 10 GT FPGA', 'Arria® 10 GX FPGA', 'Arria® 10 SX FPGA'] ['novalue'] ['novalue'] ['novalue']