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Original question:

TMS320F28027: Issue of integration of FT2232H with TMS320F28027

TMS320F28027: JTAG integrity scan test failed

rajat devagiri
Intellectual 440 points
Part Number: TMS320F28027
Other Parts Discussed in Thread: LAUNCHXL-F28027

Hi,

I m having a schematics based on TIDA01292

I m getting the following  error :

Error connecting to the target:
(Error -1015 @ 0x0)
Device is not responding to the request.  Device may be locked, or the debug probe connection may be unreliable. Unlock the device if possible (e.g. use wait in reset mode, and power-cycle the board). If error persists, confirm configuration and/or try more reliable JTAG settings (e.g. lower TCLK).
(Emulation package 8.0.27.9)

I did check device connection - it says JTAG integrity scan test failed

the XRSn signal is not low, TRSTn signal changes levels when usb is plugged in and the TEXAS instrument probes are visible in device manager, no brown out issue also checked all voltage levels, What else can be the issue??

Please help, the board has to go for production i m facing this basic issue, i m unable to resolve it

  • 0
    TI__Guru 71835 points

    Rajat,

    Looking at the TIDA01292, it looks like this is built to interface to the LAUNCHXL-F28027 launchpad dev board.  Is your issue with the LAUNCHXL-F28037 board from TI, or have you designed your own PCB based on the LAUNCHXL-F28027 schematics?

    If you are using the LP directly the most common issue is that the power jumpers JP1/JP3 and ground JP2 are not populated.  The JTAG implemenation here is isolated, so if you don't populate those jumpers there will not be power to the device.

    If you desire the JTAG to be truly isolated, then you will need to provide 3.3V into the LP connector header J1-1 and leave the jumpers un-pop'd

    This is documented in the UG here: http://www.ti.com/lit/spruhh2

    Best,

    Matthew

  • 0 in reply to MatthewPate
    Intellectual 440 points

    Hi matthew,

    The Board is not a launchxl - f28027  launchpad but it is a PCB based on the launchxl - f28027. As i mentioned i checked all the power rails, the voltages seem to be proper and also the condition of XRSn and TRSn pin, i m asking if any other reasons are present apart from this. 

  • 0 in reply to rajat devagiri
    TI__Guru 71835 points

    Rajat,

    Thanks for the additional info, if the rails are good as well as XRSn/TRSTn then I would suggest putting the device in Wait Boot Mode, by pulling GPIO37 high and pulling GPIO34 low as shown here http://www.ti.com/document-viewer/TMS320F28027/datasheet/boot-rom-litsprs230-0453#litSPRS230-0453 

    This will keep the MCU from executing code, and potentially activating the code security module which would prevent JTAG connection.

    Try the above, and let me know if you can connect with the device.

    Best,

    Matthew

  • 0 in reply to MatthewPate
    Intellectual 440 points

    Thanx for the document Matthew,  the issue was resolved, faulty FTDI driver....These are really faulty!!....resoldered FTDI devices with new ones, started to work