DRV8870: DRV8870 reverse current protection and Ivm value

Tool/software:

Hi Team

I have two question about DRV8870.

1. do H bridge need a reverse current protection? or it default need a reverse current so VM need to handle reverse current?

2. why Ivm here is only mA scale? because it look like same path with output current.

I think it current level should be also A scale. or it's other definition for below block diagram.

BRs

Brian