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PROCESSOR-SDK-AM64X: ospi mode question

Jun Tu
Expert 1370 points
Part Number: PROCESSOR-SDK-AM64X
Other Parts Discussed in Thread: TMDS64EVM

Hi,

After reading the am64r5f (spruim2h.pdf)  Trm. I have following conclusion about ospi mode, is it true or false?  all phycial hardware is based on the demo board:  tmds64evm.

(1) At application software level,   there are XIP mode and non XIP mode.     XIP mode requires only an address (no instruction) to output data, improving random access time and eliminating the need to shadow code onto RAM for fast execution.  (from this page  software-dl.ti.com/.../xip_programming_guide.html)

(2) At conrollder level, there are DAC mode and INDAC mode.  in DAC mode, msram is not required. 

question:

what is the relationship between XIP mode and DAC, can we say XIP mode use DAC at controller level.  I mean since both XIP mode and DAC doesn't need to shadow code onto RAM, can directly write to Nor flash.



for (Reference : 5. enable the DAC and, if required, the INDAC.   From TRM "12.3.2.5.6 Entering XIP Mode Otherwise")

I mean in XIP mode, we don't need msram, in INDAC it requires msram, is there a conflict between, or  part of the software can use XIP mode, and concurrent runs with Non XIP mode. 

Thanks. 

 

  • 0
    Expert 1370 points

    IS SPI Legacy Mode in tmds64evm, equivalent to NON XIP mode.

  • 0 in reply to Jun Tu
    TI__Mastermind 32464 points

    Hi Jun,

    Thanks for your question.

    Please let us know if this question is in context of MCU PLUS SDK or Processor SDK Linux?

    Regards,

    Vaibhav

  • 0 in reply to Vaibhav Kumar
    Expert 1370 points

    it is for MCU PLUS SDK  with out any OS. noRTOS,  only one single loop.  Thanks. 

  • 0 in reply to Jun Tu
    TI__Mastermind 32464 points

    Hi Jun,

    I have noted your response.

    Please expect me to follow up in few business days.

    Regards,

    Vaibhav

  • 0
    TI__Mastermind 32464 points

    Hi Jun,

    Thanks for your patience.

    Jun Tu said:
    what is the relationship between XIP mode and DAC, can we say XIP mode use DAC at controller level

    XIP is just meant for read operations hence, if you have both XIP and DAC enabled, then only XIP operations(that is the read operations would be functional) whereas operations like Writing to the flash and Erasing from the Flash will fail.

    So we would encourage to go ahead with DAC itself and not XIP.

    Jun Tu said:
    I mean in XIP mode, we don't need msram, in INDAC it requires msram, is there a conflict between, or  part of the software can use XIP mode, and concurrent runs with Non XIP mode. 

    Can you please clarify this statement.

    Looking forward to your response.

    Regards,

    Vaibhav