SPRUIM2H May 2020 – October 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
The ROM execution is directed through the main boot mode pins. This provides more flexibility and more booting peripherals to boot from. The Main domain must be powered and functional.
Main boot mode pins are shown in Table 4-2.
Any Bootmode pins marked as Reserved or not used must be tied high or low with pull resistors. They should not be left floating.
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Reserved | Reserved | Backup Boot Mode Config | Backup Boot Mode | Primary Boot Mode Config | Primary Boot Mode | PLL Config |
Table 4-3 describes the BOOTMODE pins that need to be set according to the system clock provided to the device.
The ROM Code will configure any PLLs required during the boot process. The ROM Code does not have the ability to select HFOSC1 (in Main domain) during initial boot, however the selection can be done through the boot certificate (see Section 4.7, Boot Image Format).
PLL Config Pins | Ref Clock (MHz) | ||
---|---|---|---|
B2 | B1 | B0 | |
0 | 1 | 1 | 25 |