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TMS320F28374D: High speed SPI and GPIO selection

Sheldon He
Expert 8585 points

Part Number: TMS320F28374D

Hi expert,

We are trying to put the SPI-A in high speed mode, 50Mbps. The datasheet suggests high speed SPI-A should be allocated to GPIO58~61.

But actually we are now running SPI-A on GPIO 54~57 @50Mbps, and everything seems just fine.

However we are not sure whether it’s safe or we need to change the design to be in line with the datasheet. Could you help to explain the difference of running SPI @ 50Mbps on these two groups?

Thanks

Sheldon

  • 0
    TI__Guru 50611 points

    Sheldon,

    Due to US holidays, the subject matter experts are out of office. Please expect response by Jan 5 or 6. Sincere apology for inconvenience.

  • 0
    TI__Guru** 116971 points

    Sheldon,

    I'll try to provide quick response to this query while we wait for our expert to return.

     However we are not sure whether it’s safe or we need to change the design to be in line with the datasheet. Could you help to explain the difference of running SPI @ 50Mbps on these two groups?

    We only recommend high speed operation on the pins which are mentioned for high speed operation in datasheet. Please note that this is based on full timing analysis in all the modes of SPI and across different operating conditions. Now in your application you may not be using all possible modes and many not have tested this in different conditions (like full voltage range or temperature) hence it may be working ok. E.g. if you are only using SPI as master mode and TX only (no RX data) or in slave mode and RX only (no TX data)) then it should be ok to use provided you test your system fully in all operating condition. 

    Hope this helps.

    Regards,

    Vivek Singh