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TMS320C6747: TMS320C6747的供电设计和上电时序

Part Number: TMS320C6747

控制板输入电源为5V电源,5V电源采用两个LDO分别转换为3.3V和1.2V给DSP供电,第一种方案是两个LDO的输入都是5V分别转换为3.3V和1.2V,第二种方案是先用LDO将5V转换为3.3V再用另一个LDO将3.3V转换为1.2V,

TMS320C6747的上电时序有什么要求、对LDO供电的要求有哪些、上面两种方案能否满足上下电时序要求,哪一个方案比较合适?