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  • robertferanec
    replied
    When I was not sure how to connect some signals, I always had a look at schematic of the other baseboards which were supported by that specific module.

    PS: I do not know why the signal is not on both, probably it was not needed (?) e.g. card can be enabled in BIOS or by some other different ways (just guessing)

    Leave a comment:


  • mulfycrowh
    replied
    For MXM board, you'll use PEG Signals (16 lines).
    The other PCIE lines will be used for SSD and wireless board.

    Leave a comment:


  • mulfycrowh
    replied
    That's a good start for an answer. Peripherals are standard. What I do not understand is that signal
    "PEG_ENABLE#"
    on Type 2 that is not present on Type 6.

    Leave a comment:


  • robertferanec
    replied
    I do not remember exactly, but you may need to choose based on peripherals you need (2 looks like an old one, 6 looks more suitable for today's boards) and on the module you would like to use. This is what I found (simple comparison) - is this what you mean? https://en.wikipedia.org/wiki/COM_Express

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  • mulfycrowh
    started a topic About COM Express

    About COM Express

    Hi everyone,

    It is not so easy to understand the differences between Type 2, Type 6 …
    As far I understand, new release of COM Express is 3.0 and involves Type 7.

    I would like to develop a carrier board allowing external GPU board.
    I downloaded the COM Express Carrier Board Design Guide on www.picmg.org. It is bases on release 2.0.
    The question is: should I use Type 2 or Type 6?
    In the documentation, they speak about a signal on pin D97 (Type 6) named "PEG_ENABLE#".
    Why don't we find such signal on Type6?
    The Purpose of this signal is to tell that we use internal GPU or not.

    Thanks a lot.
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