DRV8210: Why can EN control the speed of the motor when the PH/EN control mode?

Why can EN control the speed of the motor when the PH/EN control mode? I do not see this conclusion in the table given. 

Daniel：

您好

已经收到了您的案例，调查需要些时间，感谢您的耐心等待

,

Alice：

您好，

      通过EN脚控制速度

      

     请参考[FAQ] What interface (PH-EN or PWM) to use for controlling brushed DC motors – Motor drivers forum – Motor drivers – TI E2E support forums