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Problem with ADSP 21262 power supply

I have designed a board with ADSP 21262 processor. Before soldering the processor, I have verified the isolation between core supply point and the external supply point. But once the processor is wired, they show short and the same voltage, 1.2 V. Why this happens? I am giving supply from two external power supplies. In the datasheet, some 200ms requirement is given for turning on of the power supplies. Is it because of this?

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