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TMS320F280049: Stability comparison: SPI and FSI

Sheldon He
Expert 8585 points
Part Number: TMS320F280049


Hi expert,

Do we have any comparison between SPI and FSI in the same baud rate? 

My customer would like to select a serial port to use in high EMI digital power application, so they would like to know this.

Thanks

Sheldon

  • 0
    TI__Guru 52040 points

    Sheldon,

    What is the cusotmer's usecase? FSI and SPI are very different protocols. with different usecases. If the commuication is C28x to C28x, then use FSI.

    If it a SPI connection to another NON-C2000 device, then definitely use SPI.

    FSI-SPI compatibility mode is NOT raw SPI. It has SW packaging around it.

    Nima

  • 0 in reply to Nima Eskandari
    TI__Expert 8585 points

    Hi Nima,

    Thanks for response.

    My cutomer's use case is F28002x to F28004x, FSI communication will cross digital isolator here. So, in what aspect FSI is better here? (Maybe adjustalbe slew here?)

    Could you help me with several points show FSI is more robust than SCI here?

    Thanks

    Sheldon

  • 0 in reply to Sheldon He
    TI__Guru 52040 points

    1. FSI will run at 200Mbps which is incredible. 50 MHz clock + Data transfer on both clock edges + 2 lines for data.

    2. Skew compensation feature for overcoming the delays that can corrupt data when going over isolation barriers.

    3. Built in CRC

    4. Data is package when send and unpackaged when received.

    5. PING frames to ensure that the connection is ALIVE.

    6. Watchdog timers built in to make sure the connection is ALIVE.

    As far as robustness, it is MUCH MUCH more advanced than a RAW UART/SPI communication.