Description
Due to mistakes in "Table 9-12: Avalon-ST TX Interface Signals" and "Table 11-8: Avalon-ST TX Interface" of the Altera® Transceiver PHY IP Core User Guide (PDF), the tx_datak signal refers to received data for the Arria® V, Cyclone® V, and Stratix® V devices.
The tx_datak signal should only refer to the transmit data.
Resolution
The problems are fixed starting with version 14.1 of Altera Transceiver PHY IP Core User Guide (PDF).he