unused QSPI pins for i.MX 8QuadXPlus

[Derun93]

Hi everyone,

I am designing a single board computer with i.MX 8QuadXPlus. I do not need processor booting up from QSPI. So what should I do related QSPI pins of i.MX 8QuadXPlus? Tie to Gnd or leave floating?

In hardware guide, it says we can leave floating power pins of QSPI bank but nothing about data, clock and strobe pins.

Thank you. 

[igorpadykov]

Hi Derun

unused qspi pins can be left unconnected,  one can configure them as inputs with pull-up enabled.

Best regards
igor

[Derun93 · Accepted solution]

Thank you @igorpadykov for your answer. Just to be clear, if I add pull-up resistor, do these pins become input or are they already inputs with internal pull-up?

[igorpadykov]

Hi Derun

default state can be found in Table 125. 21 x 21 mm functional contact assignments

i.MX 8QuadXPlus and 8DualXPlus Automotive and Infotainment Applications Processors

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/System-Controller-Firmware-101-Pad-confi...

Best regards
igor