Configure PSSI 16 Bit and Ethernet at the same time with N6 Nucleo

[harald]

Hy,

we are about to create a Proof-of-concept system for a camera application. We want to use STM32N6 Nucleo-144 board (MB1940) Board and add a extension board to CN2, CN3, CN15 and CN16. The project needs Ethernet (which we want to use from Nucleo Board) and PSSI16 Bit (which we want to realize on the extension board).

I create a CubeMX project from scratch and select Nucleo Board as starting point.

I am not able to configure both, Ethernet and 16 bit PSSI. 

When I start from the controller itself (no Nucleo) it seems to work

What do I miss?

Best regards

Harald

 

[TDK]

Hover over the red area to see why it cannot be enabled. In this case:

So pins being used by PSSI are the problem.

 

The nucleo board has a bunch of pins locked to various functions whereas with a new chip all pins are free. The locked pins restrict the amount of flexibility you have here. In this case, these pins are locked and are preventing you from using both.

In this case, these pins are the problem:

Reset their state (Click -> Reset State), then disable and re-enable PSSI and you can enable ETH.