ID:186491 GXB transmitter channel "<name>" has reverse serial loopback enabled. GXB receiver channel "<name>" through XGMII state machine atom "<name>" has rxanalogreset signal connected. This is illegal.

CAUSE: The specified gigabit transceiver block (GXB) transmitter channel has reverse serial loopback enabled. The specified GXB receiver channel has the rxanalogreset signal connected. This behavior is not supported in simulation and is allowed because you turned on the corresponding logic option.

ACTION: No action is required. To avoid receiving this message in the future, modify the design to remove the rxanalogreset signal.