Clocked Video Output - Frame Locking - SOF

Hello together,

I've got a problem to get the clocked video output from the Altera VIP suite running into frame locking mode. I want to synchronzie the video output using the SOF input of the clocked video output component.

My system is as follows:

QSys: Test Pattern Generator -> Clocked Video Output <- external connection -> Clocked Video Input (cvi_a) -> Clocked Video Output (cvo_b) -> SDI II IP Core

cvi_a has SOF outputs for synchronization.

cvi_b has SOF inputs for synchronization.

Both components are connected for synchronization processes outside the QSys.

I set register of cvi_a at 0x00 to 0x0F for activating SOF outputs.

I set register of cvo_b at 0x00 to 0x1F for activation frame locking.

The system is working, in the case, that I see a 1080p30 SDI video at the SDI II IP Core output.

BUT, the system is not SOF locked.

The cvi_a didn't generate a SOF signal.

The cvo_b didn't lock as a result of the missing SOF input. And it doesn't generate SOF outputs itself.

-> Does anyone has an idea, why the system is not frame locking?

-> Doest anyone has experiance in frame locking for the clocked video output?

-> Is there a actual example design available for using frame rate locking?

Thank you all,

Best regards!