Intermittent Ethernet link failure and data corruption occurs when the ’Enable SGMII bridge option’ is set to OFF (1000Base-X Mode) while running any Triple Speed Ethernet variant with a transceiver.
This issue affects all Stratix V, Arria V, and Cyclone V devices.
Use an alternative 1000Base-X mode in a different IP variant:
Generate the Triple Speed Ethernet MegaCore with the ’Enable SGMII bridge option’ set to ON.
Configure the SGMII_ENA and USE_SGMII_AN bit to 0 in the PCS IF_Mode register.
This issue is fixed in version 12.0 of the Triple Speed Ethernet MegaCore function.