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TMS320F28335: Is it EPWMxSYNCI is common for all EPWM registers?

yedida ayyappa rudrasimha
Prodigy 180 points
Part Number: TMS320F28335


If I gave phase shift of phi(TBPHS) to EPWMreg5, Is it with respect  to EPWMreg1 or EPWMreg4(prior to that register) ??

  • 0
    TI__Guru 57255 points

    Hi,

    It could be either, depending on how you have the other ePWM peripherals configured.

    How is ePWM4's SYNCOSEL configured? 

    • If configured as 0 (pass through), then the phase shift will be relative to ePWM3 ePWM1 (or whoever is the PWM synchronization master). 
    • If configured as 1 or 2, then the phase shift will be relative to ePWM4.

    Hopefully this helps!

    [Revised my response on 25Mar2017]


    Thanks,
    Brett

  • 0
    TI__Mastermind 42195 points

    Yedida,

    For F28335 you should look at Figure 9 of the ePWM Reference Guide, this will show you how the sync chain is connected. ePWM5's SYNCI comes from ePWM4's SYNCO. If you want to connect ePWM5's sync signal to come from ePWM1, that is possible. You will need to simply select the correct choices for EPWM1SYNCO and EPWM4SYNCO, these options are also detailed in the ePWM Reference Guide linked earlier in the post.

    Regards,
    Cody

  • 0 in reply to Brett Larimore
    Prodigy 180 points

    Hi Brett Larimore,

    Thank you for your prompt response. All EPWM modules synchronized to TBCLKSYNC but when we are doing master slave synchronization wil it effects?

    Thanks,

  • 0 in reply to Cody Watkins
    Prodigy 180 points
    Hi Cody Watkins,


    Thank you for your prompt response. All EPWM modules synchronized to TBCLKSYNC but when we are doing master slave synchronization wil it effects?


    Thanks,
  • 0 in reply to yedida ayyappa rudrasimha
    TI__Guru 57255 points

    Hi Yedida,

    TBCLKSYNC is not really relevant to the question at hand.

    I would recommend taking a look at both Figure 5 and Figure 9 of the F2833x ePWM User Guide for more details (SPRUG04A, at the time of this post):
    http://www.ti.com/lit/sprug04

    Figure 5 shows how one ePWM module will utilize its upstream PWM's PWMSYNCI and create its downstream PWM's PWMSYNCO.  Figure 9 shows how the various ePWM modules PWMSYNCI and PWMSYNCO connect together. 
    [note that PWM7-9 do not exist on the F2833x device]

    After looking at these figures, relook at my response above.  I think it should make more sense.


    Thank you,
    Brett