The MIO Reservation feature allows you to select the unused/unassigned MIO’s as
GPIO/AUX-IO. To select these, you are required to click the MIO PIN view
button from the toolbar and
then select GPIO/AUX-IO options in the External
Usage column for the respected MIO. If any MIO is allocated to a peripheral then that
MIO cannot be set as GPIO/AUX-IO, so its External Usage drop down is disabled.
If the MIO usage is GPIO, then you can set its output data as active-High or active-Low and direction as In or Out. After boot, this value will be driven on IO when it is set in Out direction. If the IO is selected as AUX IO, you cannot select any of the MIO pin pad attributes as all are disabled.
The IO-Configuration page also allows you to select 64 GPIO-EMIO pins in PMC domain and 32 GPIO-EMIO pins in PS domain. Upon enabling this, these pins will be exposed to the PL region.