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TMC4671 undocumented pins

Category: Datasheet/Specs
Product Number: TMC4671

The TMC4671 datasheet mentions pins ENI and ENO, in chapter 8. I gathered from the TMC4671_Eval design files as well as the firmware code for the evaluation kit, that ENI probably needs to go high for the chip to activate. As for ENO, I suppose that it activates the power board.

Why isn't the pin documented in the datasheet, did I miss it somehow? I cannot see any more occurrence of "ENI" or "Enable input" than in the aforementioned table. Are there voltage requirements? Timing requirements? What happens when ENI goes low?