2.1.2 Power Supply Sequencing Requirement

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SmartFusion cSoCs have an on-chip 1.5V regulator, but usage of an external 1.5V supply is also allowed while the on-chip regulator is disabled. In that case, the 3.3V supplies (VCC33A and so on) should be powered before 1.5V (VCC and so on) supplies. The 1.5V supplies should be enabled only after 3.3V supplies reach a value higher than 2.7V.

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