DRV8711 doesn`t start

Greatings! I`m using DRV8711 for a very first time. So I setup the driver:

CTRL: 0x0019   // ENBL bit set, 8 step mode

OFF:  0x001C // 15us

TORQUE: 0x0196 // 150 in TORQUE

DECAY: default 

DRIVE: 0x05A4 // IDRIVEP 100mA IDRVEN 200mA TDRIVEP=TDRIVEN=1us

I`m sending 4kHz pulses to the step input(50% duty). I don`t recieve fault sygnals. The problem is the engine doesn`t start. There are no pulses to the gates of the MOSFETs.

What am I doing wrong?

Thanks!