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UCD90320: UCD90320 closed loop margin control with GPI pin

Part Number: UCD90320
Other Parts Discussed in Thread: TPS568215

Hi there

According to TI slva845a.pdf, margining function can be enable through two GPI (see figure 12)

Q1: what is difference between input source for margin enable and input source for margin low / not high? Both function can be used to select margin high or low? Why two GPI pins?

Q2:  Margin enable is active high or low?  

Q3: Once margin is enabled, how can I choose which power rail I want to margin?

Q4: Can I see real-time status in GPIO-monitor window in Fusion Digital power designer tool by connecting TI HPA172 to my CD90320 via PMbus interface?

Thanks

Mike Hsu