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Dear Inho -
Thanks for the post and welcome to E2E!
From the datasheet for this device, you can find on page 9 the list of GPIOs available for input polling.
NRST is pin L10, you can see it in datasheet and also how it is connected on the EVM, here: https://www.ti.com/lit/zip/swrr180
Please also see section 15.7 (starts on page 1093) in the Technical Reference Manual for this device, you will find out more regarding setting GPIO pins for input/output enables as well as consult the SDK for using SysConfig and/or the GPIO examples directly.