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C2000 Defino eMMC support

Todd Anderson78572
Guru 14640 points


All:

To add eMMC to an existing Delfino project, should I think about using an interface chip (like the NXP SDIO101A) - it appears that it would match up nicely to the external memory interface of the Delfino products. 

Is this overkill?

eMMC has an 8-bit data bus + CLK + CMD - could this be implemented using the external interface directly, or is the added "host controller" giving some benefit?

(We are interfacing to a 4 GByte eMMC part - and the SPI interface has been "end-of-lifed" so it looks like the 8-bit bus + CLK + CMD is needed...)

  • TI__Guru** 115881 points

    Hi Todd,

    Couple of questions -

    1) Which Delfino device you are planning to use?

    2) Async Interface may have the CLK but there will not be any timing for Async signals wrt the CLK. Timings will be wrt chip select and the strobes only.

    3) There is no CMD signal in Async Interface? Is this emulated by using GPIO or one of the control signal of Async interface?

    Regards,

    Vivek Singh

     

  • in reply to Vivek Singh
    TI__Genius 10190 points
    Hi Todd,

    Hope you're doing well. Did you implement the eMMC interface successfully? I've got a customer asking the same questions.

    Regards,
    Mark
  • in reply to Mark Ackerson
    Guru 14640 points
    Mark:
    Just after asking that question, I was moved to a different project. In the end, the decision was made to use the existing technology, which did not involve switching to an eMMC device, so the NXP SDIO101A never got populated onto a board. I think that the newer devices (F28377S & F28377D) have direct support for eMMC, but for older devices like the F28335, I think that the NXP device would work well as a bridge to eMMC.

    Regards,
    Todd Anderson
  • in reply to Todd Anderson78572
    TI__Genius 10190 points
    Hi Todd,

    Thanks for the reply. Maybe a good thing you didn't use the SDIO101A. Arrow suggested the SDIO101A is NRND, although I didn't see that noted on the NXP web site.

    Regards,
    Mark