Why o_rx_pcs_fully_aligned does not assert for 40GE-4 Advanced mode F-Tile Ethernet Hard IP design when Custom Ethernet line rate > 63Gbps?

Description

Due to a problem in the Quartus® Prime Pro Edition Software version 25.3 and earlier, you might observe o_rx_pcs_fully_aligned does not assert for the F-Tile Ethernet Hard IP design with below configurations:

• Advanced mode: Enabled
• Ethernet mode: 40GE-4
• Custom Ethernet line rate: > 63 Gbps

Resolution

There is no workaround. There is no fix planned in the future.

When advanced mode enabled for 40GE-4 design, supported custom Ethernet line rate is: 41.25~63 Gbps.