DRV10983: How can set DRV10983?

Part Number: DRV10983

HI :

I am useing DRV10983  .Lay out PCBA according DRV10983 datesheet.  .However, when  i connect  BLDC's  u v w wire  , and power up 12V .    motor can not run .  just fluctuate.

Speed  signal  I used 3.3V  .  I wander how can run motor up ?do i need set some parameters in DRV10983 originally ?