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ialvarez

JTAG-SMT2 incorrectly recognized by Windows

Question

We have recently purchased a JTAG-SMT2 board in substitution of a JTAG-HS2 cable, in order to program a Microzed board with Xilinx Vivado.

The same Windows machine that was working with JTAG-HS2 now recognizes the new device JTAG-SMT2 as "USB Serial Converter". We have tried some solutions in other forums, as using FTDIconfig, with no success.

What is remarkable is that, when plugging the device, Windows 1st finds a "Digilent USB device", but then automatically installs a driver and it is converted into "USB Serial Converter".

problem_jtag_smt2.png

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Hi @ialvarez

The "USB Serial Converter" is the proper device to be show in Windows Device Manager for FTDI USB based devices, JTAG-HS2, SMT2... The "Digilent USB Device" is show until the driver is not loaded or in case the installation fails.
Is the cable visible from Vivado?

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The cable seems to be seen by hardware manager in Vivado (I'm not sure if it is the current or the former cable), but fails when trying to connect. May be a hardware issue between the JTAG-SMT2 and the FPGA board?

image.thumb.png.9448c8265ab7067fb194600b7592e6dd.png

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Jon,

Thank you for your answers. I've checked the hardware and the signals connection is good.

The results of Adept. The line "Found device ID: ffffffff " repeats 32 times, then ends with "Initialization Failed."

image.png.8f31c8d4a099cb6cb8128a14a730fa2b.png

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Hi @ialvarez,

I reached out to one of our design engineers about this forum and they responded that the JTAG-SMT2 has a weak (100K) pull-ups to VREF on the JTAG lines. If TDO isn’t properly connected then adept will read “FF FF FF FF” for the ID code. It may also read all F’s if VREF isn’t powered. He wonders how you were able to connect a JTAG-SMT2 to the Microzed. It doesn’t look very easy to them, which might be why you are having problems. Their guess is something either isn’t powered correctly or something isn’t soldered correctly.

thank you,

Jon

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Dear Jon,

Microzed has the same pins in PMOD connector (for JTAG-HS3) also available in JX1 connector, so we have built a motherboard for Microzed connecting the JTAG-SMT2 to these pins:

image.png.dfa3b9d9f0cd2071a8b10f1a75a8fe20.png

We have checked the continuity between PMOD pins and JTAG-SMT2 pins and everything seems correct.

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