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DS90UB947-Q1: ds90ub947-q1 and ds90ub948-q1 Interrupt Pin (INTB)

Part Number: DS90UB947-Q1
Other Parts Discussed in Thread: DS90UB948-Q1

I have project using chip FPDLinkIII ds90ub947-q1 and ds90ub948-q1. In datasheet ds90ub947-q1.pdf and ds90ub948-q1.pdf. I am trying to learn about the interrupt pin (INTB) feature. I read about how INTB works between ds90ub947-q1 and ds90ub948-q1 (picture below) and also see that this Pin is used in repeater mode. But I wonder that what else can this feature can be used for?

            

Hope to receiver help soon!!!