21
10. System Resets
10.1 Power-on Reset
This type of reset occurs when the power is initially applied to the SOM-IMX8M-MINI. As the supply
voltage rises, the on-board PMIC holds the i.MX 8M MINI in reset until all the processor power supply
voltages have risen above the appropriate voltage thresholds (90% of the nominal values). The
internal power-on reset generation is disabled.
10.2 Brown-out Reset
In case any processor supply falls below/rises above its 80%/130% of its nominal voltage level, the
PMIC generates a reset for the i.MX 8M MINI. After the brown-out reset has occurred, the PMIC holds
the i.MX 8M in reset until all the supplies return to the range 90-110% of their nominal values.
10.3 Software Reset
This type of reset is activated by software running on the SOM through performing the i.MX 8M MINI
software reset sequence.
10.4 External Reset
To activate this type of reset, a baseboard drives low the SYS_nRST signal on the SOM-IMX8M-Mini
interface connectors. Activating this signal leads to the i.MX8M MINI SOM power cycle.
11. Boot Mode
Use the BOOT_MODE[1:0] pins to configure the SOM boot mode setting as indicated in the following
tables. The default configure is Internal boot.
Table11.1 Boot Mode
BOOT_MODE1 BOOT_MODE0 Boot type
0
0
Boot from fuses
0
1
Serial downloader
1
0
Internal boot, BOOT CFG[15:0] are used to enable boot
configure.
1
1
Reserved
The boot configuration is specified by the iMX8M MINI SOC, so for more details, refer to the iMX8M
MINI SOC documentation.
