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DS90UB953-Q1: 关于DS90UB953-Q1上电时序的疑问

Part Number: DS90UB953-Q1

从DS90UB953-Q1这颗芯片的spec来看,上电过程有两个图:"9.1 Power-Up Sequencing" 和 "9.1.1 System Initialization"

"9.1 Power-Up Sequencing"中,PDB引脚上有一个"Hard Reset"的操作。

但是在"9.1.1 System Initialization",PDB引脚上没有"Hard Reset"的操作。

所以,PDB引脚上的这个"Hard Reset"的操作,是必须有的么?

"9.1 Power-Up Sequencing"和"9.1.1 System Initialization"的关系是什么?