DP83822I: VDD Detection

Hi Team,

I have a question from customer about the VDD detection of the DP83822:

1. Is the VDD detection only done once upon power up? If it is, how long after the VDD is stable the detection is done?
2. Is the VDD detection done continuously periodically? If it is, what is the period of this VDD detection? If let say there is a glitch that cause the VDD dip to 1.8V, is the crash occurs instantly? Should not there be a filtering or multiple detection confirmation before the PHY determine the VDD is 1.8V?

Thanks! 

Best Regards, 

Alfred