DRV8889-Q1: Itrip Ivalley of DRV8889 in smart tune ripple control mode

Hi team,

When customer set DRV8889-Q1 to smart tune ripple control mode, what is the Itrip and Ivalley as in below figures?

From datasheet description, Itrip seems to the full scale current set by below equation, right? 

 But I didnt find related description on Ivalley. Could you please share what is the Ivalley or ripple controlled( Itrip- Ivalley?)

Thank you 

Scarlett