QSPI pin mux on NRF52840

[Mickael]

Hi There, 

I have been looking into how to connec my QSPI NOR Flash to the NRF52840. 

I have notivced a discrepancy between the comment in the Table 3. of the OPS and the choice made on the EVK. Please see the details in the image below:

The solution from the EVK makes more sense since it does not use the RESET pin and the SWO which have specific function... 

But I wanted to check with you that I was not missing any information there!

Thanks for your help,

Mickael

[Jørgen Holmefjord]

Hi Mickael,

The QSPI pins in the OPS are recommended pins, due to internal layout. We have not yet seen any issues with other GPIOs for QSPI, so you should be fine using the layout from the nRF52840-PDK.

Best regards,
Jørgen

[Mickael]

very clear! Thanks Jorgen.

[changjo]

Hi Jorgen,

When you say "other gpios", do you mean any high speed gpios or all gpios?

-Joe

[Kenneth]

Other high speed gpios should also be possible to use, the reason the DK use somewhat different pins than recommended in the OPS is simply because the designer wanted to have access to trace and pin reset when using QSPI.

We recommend to follow the guidelines in the OPS in terms of choice of QSPI pins as far as possible due to internal layout.