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DS90UB934-Q1: Power Sequence: what happens if VDDIO comes earlier than VDD18?

Part Number: DS90UB934-Q1

Hi!

there is a statement on datasheet of "V(VDDIO) must come before (or at the same time as) V(VDD18)"
Could you tell me what happens if VDDIO comes earlier than VDD18?  Does it damages device  or just improper start up and not initialized correctly? 

ito