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Original question:

TMS320F280049: Configurable logic block set up

TMS320F28075: Configurable CLB for 8 EPWM's

Andrew Green
Prodigy 60 points
Part Number: TMS320F28075

We have a product planned that would use a lot of EPWM's and there are not enough Trip Zones available.

We are already using 8 CBC TZ's and need 8 more. Is it possible to say feed in 8 comparator outputs into the CLB

and then AND them individually with a one of 8  EPWM channels before putting the PWM

out to the pin? It would save us bringing out the COMP signals to GPIO and ANDing them externally with the PWM.

Or if there are only 4 Tiles available one is limited to just 4 EPWM channels. 

Thanks in advance

Andrew

  • 0
    TI__Expert 3720 points

    Hi,

    If I understand the problem statement correctly then you would like to control the EPWM outputs based on 16 trips signals from CMPSS, in that case would you like to trip all the PWM modules if any of the trip signal is active? If that's the case, then you can actually the OR gate part of the EPWM X-BAR architecture and feed just single trip signal to all the EPWM modules.

    On the CLB related question, you can actually enhance the internal PWM signals and drive 4 outputs with single tile (OUT0/OUT2/OUT4/OUT5) so in total you should be able to drive 16 PWM outputs with the 4 CLB tiles.

    If my reply answers your question please click on "This resolved my issue" button located at the bottom of my post.

    Regards

    Himanshu

  • +1 in reply to Himanshu Chaudhary60
    Prodigy 60 points

    Hi Himanshu

    We have in effect 8 x EPWMA/B = 16 EPWM channels. Each EPWM module  requires two completely independent trip zones one for A and one for B.

    Our present understanding is that only EPWM Modules 1 to 4 can be enhanced by the CLB, but we would be very happy to learn if that the other modules could also be enhanced. At the moment we are testing to see if we can use the internal CBC trip zones for EPWM5-8, and the CLB for EPWM1-4.

    But what I hear you say is that  each CLB tile should be able to enhance any 4 PWM channels, and so enhancing 16 PWM channels should be possible - correct? If so that would be even better.

    Thanks for your reply

    Andrew

  • 0 in reply to Andrew Green
    TI__Expert 3720 points

    Yes that's correct, if you look into the Output X-BAR configuration table in the device TRM you would notice that outputs CLB_OUT4/5 from CLB can be routed to the GPIOs. Thus you can use these two outputs additionally to drive the PWM signals so in total 4 signals can be driven using single CLB tile. Hope this helps!

    If my reply answers your question please click on "This resolved my issue" button located at the bottom of my post.

    Regards

    Himanshu