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AM2634: There seems to be missing information in the ePWM section of the Technical Reference Manual.

Eileen Hu
Prodigy 430 points
Part Number: AM2634


In 7.4.5.11 Digital Compare (DC) Submodule of the Technical Reference Manual, a diagram (Figure 7-156) is missing. (Page 532)

I refer to this figure of the c2000 as below to configure the DC module. In C2000, the output destination of INPUTXBAR0 is TRIPIN1 and TZ1. I configured INPUTXBAR0 and I used TRIP1 as the input to DCAH, but the running result keeps failing.

Later, looking at Crossbar (XBAR) chapter, I found that the destination of INPUTXBAR0 has TZ1 instead of TRIPIN1, but is connected to PWMXBAR0 to TRIP1.

After I added the PWMXBAR configuration, the project ran normally.

I think the absence of this figure 7-156 may cause unnecessary confusion for some new users, it is better to correct it quickly or remind it in some places.

  • +1
    TI__Intellectual 2695 points

    Hello,

    Thank you for sharing the information on the missing figure in the TRM. We will take an action to add this figure quickly in the next TRM revision to avoid this issue. 

    Glad to hear that your project is working now.

    Thank you,

    Anita

  • 0 in reply to Anita Pratti
    TI__Prodigy 430 points

    Thank you for your response.

    Regards,
    Xuan
  • 0 in reply to Anita Pratti
    TI__Prodigy 430 points

    Hi Anita,

    I found another discrepancy between the figure and the content in the TRM, which depicts in figure 7.43 that system events 0 to 31 are generated from different peripherals, and it appears that all events come from peripherals. However, the following sections 7.2.7.1.1 and 7.2.7.3 illustrate that system events 32 through 63 are external and generated from different peripherals and system events 0 through 31 are internal for PRU-ICSS sources.

    I think the content should be correct rather than the figure, is that so?

    Regards,
    Xuan
  • 0 in reply to Eileen Hu
    TI__Intellectual 2695 points

    Hi Xuan,

    I will check further on this and confirm in a day.

    Thank you,

    Anita

  • 0 in reply to Anita Pratti
    TI__Expert 7075 points

    Hello Xuan,

    Table 7-61 of the AM263x TRM details the PRU-ICSS Interrupt Mapping and for additional detail on the PRU-ICSS XBAR INTR (when MII_RT_REG.MII_RT_EVENT_EN = 0), refer to Chapter 10.3.2.1 PRU-ICSS XBASR INTRTR0. 

    The peripheral interrupts are routed to the PRU-ICSS interrupt event number 32 to 47. 

    I agree with your assessment that the diagram should be updated to indicate that system events 0:31 are internal while 32:63 are external peripherals and I will put in a request to get the diagram updated to be more accurate. 

    Thank you for pointing out this discrepancy and I hope my context was helpful with any potential confusion from the diagram.

    Regards,

    Erik 

  • 0 in reply to Erik Friedel
    TI__Prodigy 430 points

    Thanks for the answer, I feel clear about it now.

    Regards,
    Xuan