DRV8703-Q1: independent PWM control logic

Hi Expert,

My customer is considering DRV8703-Q1 in new project. But have some questions need to be clarified. 

The application is for door control module. There have two motors for lock, need 3 half bridges for control. There have one case for DRV8703--when one of bridges operate as PWM switching, another bridge need to operate under HiZ mode. I checked with our datasheet. For independent PWM control mode, the IN1 for half-brige 1 control, IN2 for half-bridge 2 control. I am confused if 'X' denotes HiZ or not? 

Thanks!

Ethan Wen