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Original question:

TMS320F28386D: SPI communication signal is fine but decode result is wrong with CM-SSI

TMS320F28386D: TI SSI high speed mode question

Ryan Luo
Prodigy 20 points

Part Number: TMS320F28386D

Hi,

We ran into this problem as well: https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1029971/tms320f28386d-spi-communication-signal-is-fine-but-decode-result-is-wrong-with-cm-ssi

We saw this and applied the high speed mode,  and it works.

Is there any explanation of the high speed mode? Does this improve the SSI sample rate or less delay?
It'll be great if we know how it work

Thank you

  • 0
    TI__Guru 55700 points

    Ryan,

    When SPI baud rate is greater 20 MHz, you need to enable high speed mode.

    When high speed mode is enabled, SSICLK is reflected back (looped back) to adjust clock to external timing requirements.This allows the time between the clock as seen by remote device and internal clock to match closely.

    Regards,

    Manoj