The triple speed ethernet design channel_8_mac_pcs_gxb_arriav fails with internal error during the Quartus II compilation process. The failure is caused by the fitter failing to read pins with certain seed values.
This issue affects Arria V devices with the following design:
Device family: Arria V
IP: Triple speed ethernet
Variant: 10/100/1000Mb Ethernet MAC with 1000BASE-X/SGMII PCS
No internal FIFO
Use transceiver block, GXB
Include MDIO module
Enable SGMII bridge
Re-run the Quartus II compilation process with a different seed value.
This issue will be fixed in 13.0.