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  1.    #1  
    I am about to shop for one of those new 2GB SD cards, and it looks like they come in two speeds. Does anyone know what the maximum speed is of the SDIO slot in the Treo 650?
  2. #2  
    I thought the 650 only supported up to 1gb??? If you find that it really does support larger sizes, please post that info.
  3. #3  
    speed and size supported are different issues. there are some new very high speed SD cards that are going to be released by Panasonic and SanDisk, with up to 20 MB/s read speeds
    La Vie En Diaspora: Enfin, une émission qui raconte votre vie aux Etats-Unis

    Treo 600 in December '03, Treo 650 in February '05, HTC TyTN Pro in August '06, and back to Treo 750 in January '07, find me at MyTreo.net

    About me: story of the 100thMonkey
  4. #4  
    Quote Originally Posted by 100thMonkey
    speed and size supported are different issues. there are some new very high speed SD cards that are going to be released by Panasonic and SanDisk, with up to 20 MB/s read speeds
    Yes they are different issues, but I think one should first get a solid answer on what size the Treo 650 will support first. I would hate to seem this person buy a "x" speed 2GB card that does not work because the Treo only supports up to 1 GB.
  5. #5  
    I'm pretty sure the Treo supports SD cards up to 4GB (2^32).

    Any speed will work. If you're doing something that's time-dependent (such as streaming audio/video to/from the card), get a fast one. However, since the Treo 600's bus is pretty slow, the law of diminishing returns will kick in. Imagine it takes 100sec to get something across the bus. Now, if a card gives it to the bus in 1sec instead of 2sec, the card that's twice as fast won't feel faster than the slow card.


    Thanks,
    Peter
    Last edited by phandel; 11/05/2004 at 03:02 AM.
  6. #6  
    Can you quantify "pretty slow"?

    Thanks,
    David
  7. #7  
    From pg. 779 of the Treo 600 Developer's Guide:
    SDIO Slot
    The TreoTM 600’s Secure Digital (SD) slot supports standard SD memory and SDIO cards (1.0 spec). The data transfer will be at 24 MHz using 1-bit SD mode. SPI mode and 4-bit transfer is not supported.
    Thanks,
    Peter
  8. #8  
    Quote Originally Posted by phandel
    From pg. 779 of the Treo 600 Developer's Guide:
    SDIO Slot
    The TreoTM 600’s Secure Digital (SD) slot supports standard SD memory and SDIO cards (1.0 spec). The data transfer will be at 24 MHz using 1-bit SD mode. SPI mode and 4-bit transfer is not supported.
    Thanks,
    Peter

    Anyone have a developer guide for the 650 they can check?
  9. #9  
    Quote Originally Posted by Ben Van Gaasbeek
    At the roadshow, Peter mentioned that the Treo 650 will support up to 1GB SD cards. Now that may have been because that's all that are currently available, but it could be an imposed limit as well.

    That quote came form the following thread:
    http://discuss.treocentral.com/showt...ht=SD+Treo+650

    So I am still trying to figure out what is really real! Does it support up to 4GB, 2GB or 1GB? I need to go buy a card and I want the biggest SD card that the Treo 650 can support.
  10. #10  
    If I recall correctly, withthe 600, the SD read/write speed bottleneck is the Treo itself. The question I have is whether the device read/write speed has improved to the point where you could gain a significant advantage from one of the super high speed cards out there.
  11. #11  
    Coincidentally, 2 GBytes is 31 bits of addressing.
  12. #12  
    What's the significance of 31 bits?
  13. #13  
    One less bit than 32.
  14. #14  
    I recall in an interview with P1 brass posted here somewhere... they were asked the question of 2GB cards, and it was stated that they will be supported...

    I will try to dig that up....
    <br><a href="http://www.theused.net/"><img src="http://www.theused.net/images/buddyIcons/buddy_used_02.gif"></a><br><br>Forever in search of the next best thing... is that the 700w?
  15. #15  
    And 1 GB is 2 bits less. I was fishing for whether the processor they were using was know to only have 31bit address capability. Most 32 bit processors (as I assume it is) can address 4GB unless they have some sort of protected (such as ringed memory) scheme for memory- which seems unlikely for an embedded risc microp.
  16. #16  
    Found it!! See post #23 in this thread:

    http://discussion.treocentral.com/sh...ad.php?t=61314

    Not a bona-fide answer... but an answer.
    <br><a href="http://www.theused.net/"><img src="http://www.theused.net/images/buddyIcons/buddy_used_02.gif"></a><br><br>Forever in search of the next best thing... is that the 700w?
  17. #17  
    If the data/address path is 32 bits wide then 31 bits fits nicely into a "signed integer". to go one more bit up requires using an "unsigned integer".

    Thus 31 bits is OFTEN the upper limit on what numerous incorrectly designed/programmed - but highly prevelant - programs can address.

    And if ya don't believe that last statement, try doing anything with a file that's 2 GBytes+1 in size under ANY Windows system - and probably under any PalmOS system...
  18. #18  
    Quote Originally Posted by TreoDeJaneiro
    Found it!! See post #23 in this thread:

    http://discussion.treocentral.com/sh...ad.php?t=61314

    Not a bona-fide answer... but an answer.
    LOL...all it said was that the guy at P1 never heard of 2GB cards, that isn't exactly a vote of confidence. They should work, maybe I will order one and return it if it doesn't.
  19. #19  
    Actually...

    Quote Originally Posted by treo650luvr
    The guy from Palm said he had never even heard of a 2 GIG card but he is sure it would work. If not, I am sure someone could make a fix for it.
    I said it wasn't a bona-fide answer... but it is certainly more than anyone else has offered!!
    <br><a href="http://www.theused.net/"><img src="http://www.theused.net/images/buddyIcons/buddy_used_02.gif"></a><br><br>Forever in search of the next best thing... is that the 700w?
  20. #20  
    Quote Originally Posted by TreoDeJaneiro
    Actually...



    I said it wasn't a bona-fide answer... but it is certainly more than anyone else has offered!!
    I know, I am just giving you isht...
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