SPRUIV7B May 2022 – September 2023 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP
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 5-2.
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 5-3 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.
PLL Config Pins | Ref Clock (MHz) | ||
---|---|---|---|
B2 | B1 | B0 | |
0 | 0 | 0 | 19.2 |
0 | 0 | 1 | 20 |
0 | 1 | 0 | 24 |
0 | 1 | 1 | 25 |
1 | 0 | 0 | 26 |
1 | 0 | 1 | 27(1) |
1 | 1 | 0 | Reserved |
1 | 1 | 1 | Reserved |