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TMS320F280049C: Matlab Simulink Embedded Coder ePWM Synchronization

Part Number: TMS320F280049C

Hello,

I'm using Matlab Simulink with the "Embedded Coder Support Package for Texas Instruments C2000 Processors" Addon.

I want to create 4 PWM - Signals. These 4 PWM - Signals must be phase-shitfed to each other.

I am using ePWM 1~4. I am able to synchronize ePWM 1~3. However, ePWM 4 cannot be synchronized with the other three and the phase difference is random.

I learn that ePWM 1~3 belong to one group and ePWM 4 is another group. But how should I synchronize the four of them?

Here is my Network-construction:

Here are the respective PWM settings.

Thank you so much.