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Discussion in 'Embedded' started by Randy Yates, May 19, 2014.

  1. Randy Yates

    Randy Yates Guest

    What's the difference?
    Randy Yates, May 19, 2014
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  2. One is just a MAC, and needs a separate PHY, the other does both?

    Think of the MAC has a higher level, dealing with frames, and the PHY
    as dealing with the , *ahem*, physical layer - encoding, signaling,
    etc. In a 10mb Ethernet implementation you might use the same MAC for
    10base-5, 10base-2, 10base-T or 10base-F, but (obviously) would need a
    different physical layer (PHY) for each version. The interface
    between the MAC and PHY is not standardized, but there are some
    de-facto/common interfaces.

    These days many devices support only a single type of connection, and
    there's little or no advantage to a separate PHY, and the integrated
    device makes your parts count go down.
    Robert Wessel, May 19, 2014
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  3. Randy Yates

    Les Cargill Guest

    One is Layer 1, the other is Layer 2.

    Having to do integration of a MAC and separate PHY has advantages
    but you have to then understand the MMI. Hopefully,
    that's already in the BSP that comes with your eval board
    and is the same unless your board went off the reservation, in
    which case...

    Given the choice, all other things being equal, an integrated
    MAC+PHY is the lazy man's way.
    Les Cargill, May 24, 2014
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