AM3358: Additional condition of Power-Supply Sequencing

Part Number:AM3358

Hi,

Please tell me the reason why the following sequence was added by rev.K in the AM335x datasheet.
What will happen if this sequence is not followed?

Example)
Device breaks
Device does not start up

Figure 6-2. Preferred Power-Supply Sequencing With Dual-Voltage I/Os Configured as 3.3 V

G. If all the 1.8-V supplies are not sourced from the same power supply, it is required to power up VDDS before other
1.8-V supplies. Further, it is also recommended to source VDDS and VDDSHvx [x = 1-6] when configured as 1.8V
from the same power supply.

Best Regards,
Shigehiro Tsuda