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Quemar

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    JTAG-SMT3 to MachX02

    in Add-on Boards

    Posted

    Hi @JColvin,

    Thanks, for your feedback. 

    On our side we confirm than due to the output level shifter buffer on the TCLK of the JTAG-SMT3, this JTAG probe is not compatible with Lattice.

    If we remove this buffer, the probe became compatible with Lattice.

    On our first version of the board we had the luck or the unluck that it worked !

    To go ahead, we are interested to implement the FTDI chip as a Digilent JTAG probe compatible with Xilinx.

    As already asked in this tread, is it possible to buy a Digilent licence in order to design our own JTAG probe?

    Thanks for your help.

    Marc

    JTAG-SMT3 to MachX02

    in Add-on Boards

    Posted

    Hi @JColvin

    We made the following measurements on the JTAG-SMT3 module which is on our board.

    All the scope print screen are done with the following configuration:

    In yellow: TCLK on the output of the JTAG-SMT3 module, pin 10. (After the LS buffer)

    In blue: TCLK on the FTI FT2232H chip pin 16. (before the LS buffer)

    In red: TMS on the output of the JTAG-SMT3 module, pin 13.

    In green: DATA out on the output of the JTAG-SMT3 module, pin 12.

     

    1. Measurement done with Xilinx Vivado debugger tool:

    scope_21.png.3739da564dabd52c6f520585a17b8c93.png

    All the signals are correctly driven and the JTAG chain is correctly detected.

     

    2. Measurement done with Lattice Diamond programmer tool:

    scope_22.png.8a4c253840737df0f0ca8759220873b6.png

    The JTAG chain is not detected and we can see there is no correct TCLK output.

     

    3. The last measurement is done with another external "good" JTAG-SMT3 connected in parallel of the JTAG-SMT3 module on our board. The JTAG-SMT3 on our board is not powered and is in high impedance.  Measurement done with Lattice Diamond programmer tool:

    scope_23.png.cdc3c835a4c7be30a955b91759cd981f.png

    The JTAG chain is correctly detected but we can see that the TCLK signal partially correctly driven driven.

    Are you able to explain such differences ?

    JTAG-SMT3 to MachX02

    in Add-on Boards

    Posted

    Hi all,

    We found the cause of our problem without understanding exactly the problem.

    The problem comes from the level shifter on the TCLK which is not driven with diamond but is with Vivado.

    The TCLK is correctly generated on FT2232H side, but does not pass through the level shifter. Maybe because OE for TCLK is not correctly driven? But Why?

    And why with other JTAG-SMT3 the TCLK is working correctly?

    Are you sure there is no different versions of the JTAG-SMT3?

    Could you provide us the schematic and the layout, thus we could investigate? (Revert engineering on a small board like that is really time consuming !)

    We need really to find a solution, and quickly, because this stops a very important production !

    A quick reply would be strongly appreciated.

    Thanks,

    Marc.

    JTAG-SMT3 to MachX02

    in Add-on Boards

    Posted

    Hi @JColvin,

    The main conclusion of all this problems is that we can't integrate your JTAG-SMT3 probe in our design. We don't know why but it's like that...

    We need to intergrade our self JTAG probe compatible with Xilinx and Lattice tools on our board.

    For that, we will implement our own design based on a FTDI FT2232H and for that I think we need to buy a Xilinx-Digilent licence ?

    Could you give me the procedure or the contact to discuss with to buy such licence ?

    Thanks,

    Marc

     

    JTAG-SMT3 to MachX02

    in Add-on Boards

    Posted

    Hi @JColvin,

    Thanks for your feedback.

    I've already done lots of your advices last week:

    - We tested with many version of Vivado HWdebugger and Diamond programmer and it was always the same result. Always ok with Xilinx and not with Diamond

    - We are always able to access all the chain with Vivavo whatever if the Lattice is programmed or not or if we previously used diamond or not.

     - We tried with different clock speed and this has no impact (always the same result with Vivado and Diamond)

    - We have probed all the JTAG signals and we think there are "electrically good"

    Our conclusion is that there is a timing problem due to the use of different buffers on the Digilent probe that causes bad timing with Diamond.

    That can be due to a batch of components which are limit. 

    We continue to investigate but if someone has a best explanation?

    JTAG-SMT3 to MachX02

    in Add-on Boards

    Posted

    Hello all,

    I am facing a strange issue.

    I am using a JTAG-SMT3 probe on my product to program the following components:

    image.png.0da8c547dae05bbb54d6890b671115ea.png

    On the first prototypes all was working fine:

    - I am able to program Xilinx FPGAs with Vivado

    - I am able to program Lattice MachXO2 with diamond programmer

    On the second batch, I am always able to program with Vivado but unable to do a simple boundary Scan with diamond.

    I've replaced the JTAG-SMT3 by a Trenz TE0790 on one board and it is working fine with diamond programmer.

    The JTAG-SMT3 probes don't come from the same command/batch on the 2 versions of our board. The one with a green quality check sticker on the FTDI are not working properly. There is no sticker on the first prototypes.

    I've not found in the JTAG-SMT3 documentation a point related to different version of this probe? Have this probe different version ? Have you an idea of what's happen?

    Thanks for your help

    Marc

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