Why does an error occur when upgrading Ethernet designs that use F‑Tile Ethernet Hard IP from Quartus® Prime Pro Edition version 22.4 or earlier to version 25.3.1?

Description

Due to an issue in Quartus® Prime Pro Edition software version 22.4 and earlier, an error may be encountered when upgrading Ethernet designs created with F‑Tile Ethernet Hard IP to version 25.3.1.

• Error: ex_100G.eth_f_0: "Custom Ethernet line rate" (CUSTOM_RATE_GUI) 25.78125 is out of range: 10.3125-17.4

This problem is observed because the maximum supported line rate for the “Custom Ethernet line rate” was incorrectly changed to 17.4 Gbps.

Resolution

One workaround using the F‑Tile Ethernet Hard IP GUI is to open the .ip file, change the Ethernet mode to a different data rate, and then reconfigure it back to the original data rate.

Alternatively, edit the .ip file directly by locating CUSTOM_RATE_GUI and changing its value from 25.78125 to 10.3125 Gbps.

This issue is scheduled to be fixed in a future release of the Quartus® Prime Pro Edition software.