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c6745 & eMMC

Risto Hedman
Expert 1760 points
Other Parts Discussed in Thread: OMAPL138

Hi,

I should  use eMMC V4.4 (and V4.3) compliant  chip in my c6745 design. c6745 seems to be  V4.0 compliant. Is this interface operational, I don't need boot -properties, just data R/W with my application, booted from EEPROM.

Risto

  • 0
    TI__Guru** 116100 points

    Hi Risto,

    http://processors.wiki.ti.com/index.php/Managed_NAND

    C6745 would support eMMC with V4.0 compliant,

    It is operational and tested with eMMC compliant V4.0,

    but, I'm not sure for v4.4 or v4.3

  • 0
    TI__Mastermind 43660 points

    Hello Hedman,

    Yes. the C6745 device is compliant to MMC V4.0 (Not V4.3 or V4.4), which means it can support MMC 8 bit mode at 52 MHz.

    If you don't need any boot features supported by V4.3 or V4.4 and just doing data R/W, i would recommend you to use V4.0 chip instead going with higher version chip with additional cost.. 

     

    Regards,
    Senthil

  • 0 in reply to Senthilkumar Srinivasan
    Expert 1760 points

    Thank you Senthil,

    Does this V4.0 interface allow card capacities up to 32G?

    Best Regards,

    Risto

  • 0 in reply to Risto Hedman
    TI__Guru* 78495 points

    Hi Risto 

    As per the MMC v4.0 specs the support for 32 GB came out on later versions and is not part of v4.0 spec. 

    The MMC/SD controller on C6745 is same as what we have on other devices within the ARM+DSP, DSP only, ARM only family (OMAPL138, OMAPL137, C6748, AM18xx, AM17xx)

    So you might find some of the following threads useful

    http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/290019.aspx

    We have tested with 32GB SDHC , but I do not believe we have done any testing with higher density MMC/eMMC. 

    Please also note that c6745/OMAPL137/AM17 does not support booting from MMC/SD , OMAPL138/C6748/AM8xx does. 

    Regards

    Mukul 

  • 0 in reply to Mukul Bhatnagar
    Expert 1760 points

    Thank you Mukul,

    So if you have tested 32GB SDHC there should not be HW- interface problem. I'm actually using "Managed NAND" Titus referenced in his reply. Are there any app. note, code or other additional information about your 32GB SDHC test - 32G is my target density.

    risto

  • 0 in reply to Risto Hedman
    TI__Guru* 78495 points

    Hi Risto

    I have not looked at the subtle differences in the SD vs MMC specs. SDHC would be governed by the SD spec, and we do show in the datasheet that SDHC is supported.

    Managed nand, these days is typically eMMC, and I am not aware of us testing any MMC or eMMC with 32 GB density. I am not sure if it works, so I recommend testing this out as part of your evaluation before making final design decision.

    Regards

    Mukul