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VDDALV before DVDD1V5 or DVDD1V5 before VDDALV on power up?

Sean McFarlane
Prodigy 30 points

There is a discrepancy between the datasheet, SPRS866E, and an app note entitled “Keystone II Power Supplies and Power Sequencing” regarding the power up sequence (both Core before I/O and I/O before Core). Specifically, the app note describes the power up sequence as follows

 

CVDD/CVDDT -> CVDD1/CVDD1T -> VDDALV -> VDDAHV/AVDDA15:01/DVDD1V8/VDDA18 -> DVDD1V5

 

Meanwhile the datasheet describes the power sequence as

 

CVDD/CVDDT -> CVDD1/CVDD1T -> VDDAHV/AVDDA15:01/DVDD1V8 -> DVDD1V5 -> VDDALV

Is there a reason for this difference? Was there a revision change that wasn't documented? Is the sequence inconsequential.

Thanks,

Sean