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TMS320F280039C: EPWM global load configuration

Johnny Chen
Expert 5260 points

Part Number: TMS320F280039C
Other Parts Discussed in Thread: SYSCONFIG

Hi Champ,

I am asking for my customer. 

They are referring to SPRACY1 app. note to configure LLC EPWM global load configuration.

The global load configuration in one of our ref. design is as follows.

image.png

Configuring the same setting on sysconfig, there will be warning at EPWM Action Qualifier on both ePWMxA and ePWMxB Output as shown.

image.png

(1). Does the warning on ePWMxA Shadow Mode Enable need to be taken care ? If ePWMxA Shadow Mode Enable isn't enabled, would it violate any global load or EPWM AQ setting? 

(2). If it needs to be taken care, even I tick the checkbox for enabling ePWMxA Shadow Mode Enable, the warning is still there. Could I just ignore the warning?

Thanks for the input.

Regards,

Johnny

  • 0
    TI__Expert 7380 points

    Hello Johhny,

    1. Yes — shadow mode must be enabled for AQCTLA/AQCTLB to participate in global load.

    The TRM is explicit: when global load is active, the shadow-to-active register transfer only occurs for registers that have shadow mode enabled. If AQCTL[SHDWAQAMODE] is left at 0 (immediate mode), writes go directly to the active register, completely bypassing the global load synchronization mechanism.

    2. Yes, you can ignore the persistent warning by pressing suppress.

    Please let me know if you have any more questions or concerns.