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Bus Transceivers

Discussion in 'Electronic Design' started by Antonis Konstantinos, Sep 2, 2004.

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  1. Hi all,

    In an embedded processor board I see that there are bus transceivers
    (ti 74lvth162245) on data and adress buses between processor and flash
    memory, but not between processor and sdram.

    In another board I see that there are no transceivers for sdram and
    flash memory but there is for the compactflash bus (addr and data).


    What is the reason behind using bus tranceivers and when should I use
    them ?


    Thanks a lot.
     
  2. Tim Wescott

    Tim Wescott Guest

    You would want to use bus tranceivers when the processor is too wimpy to
    drive the data (and address) lines, or if you want to isolate the
    processor from a section of memory (odd, but sometimes handy).

    When and if to use bus transceivers often has some gray area, and often
    boils down to opinion. Certainly using them to drive a "real" bus makes
    sense. I'm not sure why you'd see a board that would leave them off of
    the (fast) SDRAM and put them on the (slow) flash, unless there was a
    long copper path to the flash, which would require termination, which
    would require more drive...

    I do know of one chip (the Motorola MPC860) that would have had timing
    problems if we'd put bus transceivers in between it and its SDRAM. We
    ended up laying out the board with the SDRAM chips up hard against the
    processor, which left us with traces short enough that we could get away
    without termination.
     
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