DRV8432EVM Output voltage oscillation

Hi,

I have a question on the output voltage oscillation of the DRV8432EVM board.

I supplied the board with a ~3.6 V pulse (20 kHz) from a signal generator. The output was connected to a ~0.9 kohm resistor, but there was an voltage oscillation in the first 1 usec. How can I eliminate this oscillation? 

Best regards,

HT Kim