TMS320F28377S: CMPSS module Ramp Generator

For Ramp Generator Configuration using driverlib we have to use this func CMPSS_configRamp() and select PWMSYNCSOURCE as any of the EPWM module, 

I have a question here, whether any additional configurations are required for the sync. like it should occur at TBCTR = zero or Period.

I found this PWMSYNCSEL bit field that is used to select the source for EPWMSYNCPER that goes to CMPSS.

Is it also required to be set for Ramp generator configuration?

Thanks.