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Original question:

DP83TG720S-Q1: Daisy Chaining

DP83TG720S-Q1: Interfacing a STM32-G431 microcontroller with DP83TG720 or DP83TC812

Mo Mizzi
Prodigy 160 points
Part Number: DP83TG720S-Q1

We were trying to see if it's possible to daisy chain STM32 - G431 micro controllers using one of your 100/1000-Base-T1 systems. I understand STM32 may be a little out of TI's range of help, but just trying to get an idea of how to go about it. The G431 series micro controller doesn't have a MAC layer, but can communicate over SPI. I'm guessing we may need an ethernet controller that can communicate over SPI and interface with the PHY layer on the DP83TG720 or DP83TC812 ? Please advise if this sounds right or your recommendations?

There's also a need to use the STM32 to work on a lower data rate (similar to FDCAN rates, ~10mbps), but other devices on the bus would need higher speed and bandwidth. Can they both co-exist on the same bus without any issues, or would need something to decouple them ? Handle through a switch etc? Please advise on any part#s you'd recommend us to look into

Any guidance would be very helpful. I'm open to your part recommendations.

Thank you.

  • 0
    TI__Expert 4720 points

    Hello Mo,

    In regards to your first question, yes an ethernet controller will be needed as the MAC layer is necessary. 

    For your second question, I will need to understand what devices will be at the end that work on lower data rates? Are they additional 10-Base-T1 PHY's?

    Regards,

    Avtar

  • 0 in reply to Avtar Dhaliwal
    Prodigy 160 points

    Hi Avtar,

    Thank you for your prompt reply.

    Avtar Dhaliwal said:
    In regards to your first question, yes an ethernet controller will be needed as the MAC layer is necessary. 

    Do you have any recommendations, among TI's ethernet controllers for such an application.

    Avtar Dhaliwal said:
    For your second question, I will need to understand what devices will be at the end that work on lower data rates? Are they additional 10-Base-T1 PHY's?

    For the lower data rates, it's mostly the STM32 micro controllers, communicating around 10mbps (at the most 100 mbps). However, there'll be cameras that'll be streaming and will require higher speed (would need the 1000 Base-T1 system for them). Please let me know if you need anything else.

  • 0 in reply to Mo Mizzi
    TI__Expert 4720 points

    Hello Mo, 

    TI does not have ethernet controllers but we do have Processors with built in ethernet controllers if you are interested.

    As for the lower data rates it should be ok, but you would have to check if the micro controller supports it. 

    Regards,

    Avtar