DRV8701: DRV8701P Delay issue

Part Number:DRV8701

Dear TI:

Waveform and SCH.(Please visit the site to view this file)
Ver .A  the circuit works normal.
Ver B. Change  MCU(p2p but more flash.)  But the circuit can't work. the motor stop work.
Note: the sch and pcb layout are all the same. 
from the waveform, it seems the decay time become longer.
how can i do to optimize the waveform ,and make the motor move smoothly. thanks