The following set of steps shall occur on the EVM and AM261x to boot the device from power-on reset.
- PORz is held low by the external power supply monitor
- VDDSHV_x 3.3V supply ramps to its nominal voltage
- This requires a logical AND be applied to the power good signal generated from each supply
- Delay at least 50μs after VDDSHV_x 3.3VB is at valid range
- VDDSHV_x 1.8V and VDD 1.2V/1.25V supplies ramp to their nominal voltages (no constraint on order of 1.8V and 1.2V/1.25V ramp)
- SOP[3:0] pins held in their boot latch state
- Power-Good supervisor output triggers based on valid 3.3V, 1.8V, and 1.2V/1.25V all being at valid range
- PORz low to high transition is triggered by Power-Good supervisor output
- Warm Reset output will toggle low to high tWARMRSTZ seconds after PORz transition
- After internal supply monitors show externally and internally generated supplies are stable, the SOP[3:0] pin states are latched
- R5F cores are unhalted and SOP selected boot ROM execution begins