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LAUNCHXL-F28379D: 3 Phase SPWM w/ CLB on ePWM outputs

Colin Bryant
Prodigy 60 points
Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: C2000WARE, SYSCONFIG

Hello TI,

Am using LAUNCHXL-F28379D

Looking to perform some Logic Operations on ePWM outputs using Configurable Logic Block (CLB).

Example:

Is this realizable?

If so please advise.

Best,

Colin

  • 0
    TI__Mastermind 30185 points

    Hello Colin,

    Yes, this is possible; you can refer to the "Global Signals and Mux Selection" table and "Peripheral Signal Multiplexer Table" table in the CLB Input/Output Connection section of the CLB chapter. The specific connections you point out are there, and in fact there is a CLB example that does something similar to this provided in C2000Ware (C2000Ware_5_00_00_00\driverlib\f2837xd\examples\cpu1\clb\clb_ex1_combinatorial_logic).

    Best regards,

    Omer Amir

  • 0 in reply to Omer Amir
    Prodigy 60 points

    Hello Omer,

    I did explore the CLB and was able to use syscfg to generate the logic needed.

    Question now is can I make the FSM  behave as one of the 4 input LUT's?

    Is there an example available for this?

    Best,

    Colin

  • 0 in reply to Colin Bryant
    TI__Mastermind 30185 points

    Hello Colin,

    We do not have any examples of using the FSM as a LUT I believe, is there a reason you need to do this? Based on the design you have in your initial post you need 3 2-input LUTs, which there are available for the F2837xD device. Are you needing an extra one? If so, it should be possible to create a 4-input LUT based on this detail in the technical reference manual:

    In SysConfig, the 16-bit output equation is the "LUT Output Equation":

    Best regards,

    Omer Amir

  • 0 in reply to Omer Amir
    Prodigy 60 points

    Hi Omer,

    Thanks for getting back to me and for the info.

    After re-thinking it, I'm not sure using FSM as LUT will work for me.

    I need multiple versions of original block shown in first email above.

    The syscfg block for original block looked something like the following. This was done/used just to get familiar with CLB.

    Latest version has a bit more detail.

    The MCU (F28379D) I am using has 4 Tiles, I need 6.

    We added some logic so I can get 6 from 4 tiles but, had to use 2 outputs from Tiles 0 and 1 each, to feed Tiles 2 and 3 respectively as inputs.

    Was originally trying to avoid using outputs from one tile to feed another, this is why I inquired about the FSM's.

    Am wondering if this would create a timing issue?  Am hoping to program MCU soon to see what happens.

    Best,

    Colin

  • 0 in reply to Colin Bryant
    TI__Mastermind 30185 points

    Hello Colin,

    If you're concerned about any timing issues, you can always use the simulation feature of the CLB Tool. You can refer to this User's Guide for more details on how to set it up and utilize it. Just as a note too, inputs to the CLB which are synchronized (such as those coming from other CLB tiles), need to have the input pipeline filter enabled for these sorts of timing concerns. Please use the simulation tool and let me know if you have further questions.

    Best regards,

    Omer Amir