nRF5340 - CSN pin assignment

[Gabriele]

Hi all,
I need to use the nRF5340's SPIM4 peripheral for 32 Mbps communication.
I see dedicated device's pins are pre-assigned on nRF5340 for SPIM4, ad I want to use these

B1 - CLK
C1 - MISO
C2 - MOSI
B3 - CSN

I also want to connect SWO ouput to a connector header for debugging purposes.
Unfortunately SWO is available on pin B3, which is multiplexed with CSN.
Can I assign a different pin for the CSN only, leaving dedicated pins to all other SPIM4 controls ?
For example

B1 - CLK
C1 - MISO
C2 - MOSI
B3 - SWO
E7 - CSN

Best Regards

[Vidar Berg]

Hi,

This is the feedback I got from one of the designers:

"I expect it to be OK with another IO for CSN, but we haven't done timing analysis for this case. As for all high-speed interface signals the recommendation is also for CSN to keep PCB traces as short as possible."

 So yes, it will probably be fine if you select another pin for the CSN.

Best regards,

Vidar