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DRA7xx SoC related queries

K Md Feroz Irfan
Expert 7225 points


Hi Champs

Could you please help clarify/confirm on max J6 capablites  

  1. Max DDR3 size that can be connected to 2 EMIFs on J6 – Is it 2GB * 2 = 4GB?
  2. Can the MMC interface be used to connect 16GB memory? or 32GB SD Cards?

Best Regards

Feroz

  • 0
    TI__Intellectual 2330 points
    Hi Feroz,

    1. Yes, 4GB is the max supported size of SDRAM connected to J6. Each EMIF supports up to 2GB.
    2. I think MMC may support SD card sizes even greater than 32GB because according to JEDEC, SD cards are addressed using 32-bit CMD argument and the J6 MMC/SD controller also has a 32-bit register to specify the command argument - the MMCHS_ARG register. There is no HW limitation. The J6 MMC/SD controller supports SDSC, SDHC and SDXC. If there is any limitation it may be caused by the OS.

    BR,
    Dobrin
  • 0 in reply to Dobrin Dobrinov
    TI__Genius 10180 points

    Irfan, Dobrin,

    SDSC and SDHC are both supported under the current SW.  SDXC uses exFAT, which is a Windows proprietary filesystem.  If customer/SW has the corresponding driver integrated they can interact with SDXC cards and develop MMC code on top of it.

    J6 ROM does not handle exFAT format, hence SDXC is not supported in the ROM stage.  

    Thanks & Regards,

    Shiou Mei

    *Updated with clarification