A question about realize EPWM TZ CBC by Compss and Epwm X-bar for TMS320F280049

Hi, all

     Question Description:

          I want use Compss registor , epwm X-bar and  Epwm TZ CBC submodule to realize current limit. but I am failed.

and my thought describe as  reference manual show :

and the method like the red line show .

and the register configure key code as follow:

so pls help to find the fault that cause it does not work. thanks