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eMMC vs HyperFlash - Page 2 — Parallax Forums

eMMC vs HyperFlash

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Comments

  • RaymanRayman Posts: 14,157
    That’s the connector that is hard to source...
  • RaymanRayman Posts: 14,157
    Got my emmc board today. Even came with the uSD adapter...

    But, the header is not 0.1" pitch as I expected... Guess I read it wrong...

    Not sure if I have one of these headers around or not...
    3024 x 4032 - 3M
  • RaymanRayman Posts: 14,157
    It works when I stick it in uSD reader on my PC.
    But, doesn't work when I stick it into my P2 Eval board.
    Seems I have to figure some things out...
  • RaymanRayman Posts: 14,157
    I think I found the header for this thing at Digikey:
    Surface mount: ‎952-1410-5-ND‎
    Thu Hole: ‎952-1681-ND‎

    Also, it looks to me like this Sparkfun SOIC to DIP adapter will work for the surface mount one
    ‎1568-1091-ND‎

    Maybe two of these would work for the thru-hole. Not clear though:
    ‎F127T254P16-ND‎
  • RaymanRayman Posts: 14,157
    The Sparkfun adpapter might just work...
    I'm worried about hooking it up backwards and frying it...

    It's not actually a Samsung chip, as shown on Amazon though...
    3024 x 4032 - 3M
    3024 x 4032 - 3M
    3024 x 4032 - 2M
  • If there are any unused signals or multiple grounds etc on your eMMC connector you might be able to cut off a short length of pin wire and use it as a key in the connector to prevent inserting the module the wrong way.
  • Given that it fits both ways, the pinout should(TM) be designed to not cause damage when reversed. If that is not the case, whoever did it should reconsider their life choices.
  • RaymanRayman Posts: 14,157
    The good news is that I can use the uSD adapter to get my code up and running without having to deal with my own messy adapter.

    The bad news is that I can't find ANY low level code for bit banging the interface. All the examples I can find are using an SPI peripheral to do the work. And, I don't really want to dive into the guts of another MCU to figure this out.
    Fortunately, somebody had JEDEC Standard No. 84-A441 for download on the internet.
    They must have missed their cease and desist letter or something...

    That seems to tell me what to do, although in the most obtuse way possible...
  • hinvhinv Posts: 1,253

    Did you get this working in all of it's 8-bit glory? If so, what kind of speed and latency?

  • RaymanRayman Posts: 14,157

    Did get it working. Sure it’s posted somewhere…

  • RaymanRayman Posts: 14,157

    Here's the link to the code thread:
    https://forums.parallax.com/discussion/171653/fsrw-for-emmc-with-8-bit-bus-now-at-28-mb-s-example-code-posted#latest

    Apparently not the fastest version though...

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