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EMU pins

Rob Alack
Prodigy 30 points

I notice on the 8168 that all the EMU pins are connected. But on the 8148, the EMU2, EMU3, and EMU4 are multifunction pins.  What do EMU2, EMU3, and EMU4 do? I noticed on the Black Hawk XDS560v2 debugger they are connected to:

EMU2 - TRCLK

EMU3 - TRD0.0

EMU4 - TRD0.3

These EMU pins share a function with the VOUT port. I need the VOUT port, so can I just not connect the the EMU signals? What will I lose as a result?

 

Thanks

-Rob

  • 0
    TI__Intellectual 1040 points

    Rob,

    These EMU signals are used for advanced high speed TRACE debug.  If you do not need this in your design, they can be left unconnected on the JTAG connector.  More info can be found here: Link

    Best regards,
    Scott

  • 0
    Mastermind 8040 points

    Although this thread is pretty old, since it was recently linked to I'm bumping it anyway to add a relevant observation:

    The two functions do not actually conflict!  EMU2-4 are output-only, just like the VOUT function they are multiplexed with, and more importantly they are multiplexed with the least significant bit of each channel (assuming 8 bits per channel is used).  This means that the only impact is that when the pins are reconfigured for trace output, it would add some very subtle noise to the video output, while during normal operation the jtag header is not connected and should not affect the video signal.

    Kudos to the chip designer who made this clever choice!