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XDS100v2 20-pin TI trouble with connection to JTAG interface

Svyatoslav Venskiy
Prodigy 180 points

Hello

I use XDS100v2 20-pin TI connected with my board (beaglebone black), without JTAG header. I soldered 20-pin cable directly to the board and connected to XDS.
It looks like this:

When I start "Test connection" in "Target Configuration", i get an error: 'SC_ERR_CTL_NO_TRG_POWER'

I checked each pin and on 5-th pin 3.48V. Or, i can't connected JTAG like that?

Best regards, 

Svyatoslav

  • Guru 192875 points
    Hi,

    You can connect in this way but check for any shorts. This should work.... btw why don't you simply go for a header!
    Check the connections on the XDS side too.

    Regards,
    Gautam
  • TI__Guru**** 169584 points

    Svyatoslav,

    I agree with Gautam: check for an open circuit or even shorts between pin 5 (TVRef) and other pins or pads on the board.

    I also agree with Gautam regarding the use of a connector: the XDS100 will run its TCLK at 1MHz and the entangled wires may introduce a lot of crosstalk, inconsistent delays and there is a strong chance the JTAG communications will be degraded.

    All in all, good luck with your connections.

    Regards,

    Rafael

  • in reply to desouza
    Prodigy 180 points

    Gautam, Rafael, thanks for response.

    I guess that maybe XDS died. I connected XDS to generator,to check to see whether CCS power or not.
    This is result:

    I got same error.

    Now I try to connect it to another board and check on it.

  • in reply to Svyatoslav Venskiy
    Guru 192875 points
    Is this 3.3V? If so then it seems to be correct only.
  • in reply to Gautam Iyer
    Expert 1080 points

    Hello,

    I believe that P2 on the BeagleBoneBlack is a compact TI 20-pin JTAG connection.  You need to verify that you are translating the signals to an ARM 20-pin JTAG connection properly.  This includes knowing which pin is Pin 1 on the USB100v2-ARM (XDS) unit.  I mention this because in the image above with the volt meter it looks as if you are measuring voltage on Pin 3 (nTRST) with the other wire connected to pin 19.

    As mentioned above, the wires can add a lot of noise and it may be better to solder a cTI header to the board and use the USB100v2 model that has a cTI JTAG connection.

    BTW, you can refer to this TI document for JTAG headers and signal information: SPRU655

    Cheers,

    Andrew

  • in reply to Ferrari5699
    Prodigy 180 points

    Thanks, Ferrari.

    I already ordered the header FTR-110-03-GD-06. I hope it will come as soon as possible.

  • in reply to Svyatoslav Venskiy
    TI__Guru**** 169584 points
    Hi,

    Just adding to Andrew's reply, a quick JTAG pinout reference table is shown in the link below:

    processors.wiki.ti.com/.../JTAG_Connectors

    Cheers,
    Rafael