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关于多片TPS7H1101的上电顺序控制

TPS7H1101的数据手册里说在输入电压小于3.5V时,芯片的EN管脚不起作用,要用SoftStart(SS)管脚用作使能功能,在数据手册的第23页有下面的电路图:用LDO2的PG信号接到LDO1的SS管脚实现上电顺序控制。请问图中的两个电阻的作用是什么?两个电阻的阻值和Vext的大小要这么确定?另外TPS7H1101的SS管脚能不能用作电压跟踪(Tracking)功能?求各位给予帮助与解答,谢谢