XDS100v2 20-pin TI trouble with connection to JTAG interface

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

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.

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

Thanks, Ferrari.

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