TSE (Ethernet) - Core does not transmit data on RGMII TX, rest works perfectly fine

No idea? :)

Maybe to add some information: I don't connect the TSE core via MDIO to the PHY (Marvell 88E1111), but since the only troublesome part at the moment is about the core not responding to the input data ff_tx_data, the view on the world outside the core according to me is anyways not of any concern at that point.

Maybe someone has an idea why the core does not put out transmit data on RGMII_OUT, even though it does in simulation and the user application data on ff_tx_data seem to be transfered correctly into the core?