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PROCESSOR-SDK-AM335X: Clarification on GPO shift out mode

David O'Brien
Prodigy 40 points

Part Number: PROCESSOR-SDK-AM335X

Tool/software:

Page 30 of the AM355x PRU-ICSS guide (publication SPRUHF8A) describes the GPO shift out mode utilizing two 16-bit shadow registers. Is this a parallel or serial shift out operation?

  • +1
    TI__Guru** 110030 points

    Hello David,

    You can use direct input/output (i.e., this is "parallel", shift in/out, or for inputs only, up to 16 bit parallel capture (different from direct input because the data is captured on the rising or falling edge of CLOCKIN, instead of getting updated each PRU clock cycle).

    For more details, refer to the AM335x Technical reference manual, chapter PRU-ICSS, sections "General-Purpose Inputs (R31): Enhanced PRU GP Module" and "General-Purpose Outputs (R30): Enhanced PRU GP Module".

    Regards,

    Nick