Problem with Scaler II in polyphase 422 mode

Altera usually ships the Nios code with reference designs (eg, UDX4) or with the example design (check if the 11.0 example design has been released).

Be aware that you must not use the Scaler I coefficients generation code with Scaler II. The slave interface has changed and there were also minor algorithmic modifications so the old coefficients will not be appropriate for the new Scaler.