DRV8316: The slope of the no-energized period appears to be reversed. How to align and start up the BLDC motor to get the correct waveform?

Hi, team.

I've heard it before, but please let me know how to to align and start up the BLDC motor to get the correct waveform?

The problem is slope of the no-energized period appears to be reversed as shown in fig.1.
I would like to get the waveform shown in fig.2 at startup.
(The waveform at startup of a commercially ESC will immediately look like fig.2.)

fig1. My BEMF waveform at start up and open loop control 

fig2. Desired Waveform

fig.3 Stages of Motor Control TI Precision Labs – Motor Drivers page 6