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maximum size of micro sd card

pavithra pavithra
Intellectual 870 points
Other Parts Discussed in Thread: TMS570LC4357, TMS570LS20216

hello team,

what is the maximum memory size of micro sd card that can be used with TMS570lc4357 and TMS570ls20216.

what are the consequences when we exceed the memory  limit?

no information regarding this is provided in hdk user guide ,so if you provide some manuals for reference it will be very useful.

thanks in advance.

  • 0
    TI__Guru 68540 points

    Hi Pavithra,

    On these two parts you would be using SPI mode.  I can't find anything in the SD Card simplified spec https://www.sdcard.org/downloads/pls/simplified_specs/part1_410.pdf that limits the size just based on the fact that you are using SPI mode.

    But it looks like what you will run into are issues crossing over from SDSC, SDHC, and SDXC.   Check out figure 7-2 for example.  

    Also there are different file systems required at the size breaks.  

    So I think you're going to find that the 2Gig/4Gig and the 16G/32Gig boundaries are the natural places where you'd run into issues that most likely would be software related.  i.e. you would need your SD software to be smart about putting the card into the correct mode per figure 7-2 and you'd need to have in addition the various file system support.

    That's just a stab at the answer.  I haven't tried this myself.    There is a decent amount written up online in various places about SPI mode and SD cards though that can be found w. Google.

    If you are using some specific software library from TI then we can go back to the library owner and find out a more detailed answer as to what is supported.   Just let me know if this is the case and where you got the library.

  • 0 in reply to Anthony F. Seely
    Intellectual 870 points

    Anthony thanks for your response.

    we are trying to figure out what could be the maximum external memory interfaced (including EMIF) with tms570lc4357. we dont use any specific software library. 

    thanks again

  • 0 in reply to pavithra pavithra
    Intellectual 870 points

    can u please give some suggestions regarding maximum external memory that can be interfaced??

    thanks

  • 0 in reply to pavithra pavithra
    TI__Guru 68540 points

    Pavithra,

    Well a device like an SD Card or NAND doesn't present itself as direct mapped memory.  They present as a block device and in this case you can be almost 'unlimited' in size ... it's basically left to the definition of the command set to determine the maximum number of blocks.   And then this translates to more of a software or standards question than a hardware question.

    I think you'll find the maximum single memory chip that you can attach to the LC4357 is a 8M x 16 x 4 bank device.  This
    is 64 MBytes.    An example of such a device would be http://www.issi.com/WW/pdf/42-45R-S_86400F-16320F-32160F.pdf