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DRV8834: Timing requirements of twake

Part Number: DRV8834


Hi,

Now  I am study DRV8834 for stepper motor.

But, I am confused about the Maximum wake up time.

It define the wake up time as nSLEEP inactive to STEP in datasheet and it's Maximum value is 1ms.

Does it mean the STEP should be start after or under 1ms when nSLEEP pin turn high? 

If the STEP signal need 1ms delay at least, why the wake up time not marked as minimum value?

Please help to solve my confusion.

 

Thanks.