J-Link doesn't work

This site uses cookies. By continuing to browse this site, you are agreeing to our Cookie Policy.

  • J-Link doesn't work

    Hi

    My J-Link can't connect to my target board which is Digi Connect ME (NS7520) development board.
    The following are the erroro message copied from J-Link GDB-Server log window.

    ***** error message ******
    ERROR: Could not find supported CPU core on JTAG chain
    ERROR: Could not connect to target.

    J-Link connected
    Firmware: J-Link compiled Jun 28 2007 10:45:08 ARM Rev.5

    Resetting target and trying again to connect...
    ERROR: Bad JTAG communication: Write to IR: Expected 0x1, got 0x7 (TAP Command : 2) @ Off 0x5.

    ERROR: Could not connect to target.

    J-Link connected
    Firmware: J-Link compiled Jun 28 2007 10:45:08 ARM Rev.5

    Resetting target using BP@0 and trying again to connect...
    ERROR: Could not find supported CPU core on JTAG chain
    ERROR: Could not connect to target.
    ****** end of error message *****


    It also pops a window up and says "TCK (pin 9) low, but should be high. Please check target hardware."

    I am sure my target board is OK. Don't know why the J-Link doesn't connect to my board.
    Could anybody help !!

  • Hello HenryChou,

    I have tested the Digi Connect ME NS7520 Eval board with J-Link and it works fine.

    How is your J-Link connected to your target hardware?
    Do you have a standard JTAG 14-pin adapter?

    Best regards,

    Alex
    Please read the forum rules before posting.

    Keep in mind, this is *not* a support forum.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/
    Or you can contact us via e-mail.

  • SEGGER - Alex wrote:

    ...Do you have a standard JTAG 14-pin adapter...


    Hi Alex

    Yes, I do have JTAG 14-pin adapter. But I did not use it. I used the 20-pin cable since the original Digi connect ME board had only a 20-pin JTag socket.
    Actually, my J-Link was working fine for the past week. Somehow it just did not work today :(

    Is there anything I can do to examine my J-Link for further information?

    Regard,
    Henry

  • Hello HenryChou,

    did you change something since the last time J-Link GDB Server worked?
    Did the J-Link GDB Server stop working after a software update?
    If yes:
    Which software version did you use before J-Link stopped working
    and which software version do you use now?
    Does J-Link.exe connect to the target?

    Best regards,

    Alex
    Please read the forum rules before posting.

    Keep in mind, this is *not* a support forum.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/
    Or you can contact us via e-mail.

  • SEGGER - Alex wrote:

    did you change something since the last time J-Link GDB Server worked?

    Software setting, No.
    Haredware setting, Yes, unplug JTAG, and couple hours later re-plug in JTAG on the Digi board with no power supplied.

    SEGGER - Alex wrote:

    Did the J-Link GDB Server stop working after a software update?

    No. No update. The GDB server stop working after I re-plug in JTAG on the Digi board.

    SEGGER - Alex wrote:

    which software version do you use now?

    J-Link ARM V3.74j

    Also tried v383a, no luck :(

    SEGGER - Alex wrote:

    Does J-Link.exe connect to the target?

    Not now. It was ok :(
    The following is the message from J-Link.exe

    // ----------- J-Link message --------
    SEGGER J-Link Commander V3.74j ('?' for help)
    Compiled Oct 30 2007 19:51:32
    DLL version V3.74j, compiled Oct 30 2007 19:51:29
    Firmware: J-Link compiled Mar 3 2008 19:52:16 ARM Rev.5
    Hardware: V5.30
    S/N : 30001077
    OEM : DIGI-LINK
    Feature(s) : GDB
    VTarget = 3.254V

    Error: TRST (pin 3) low, but should be high. Please check target hardware.
    JTAG speed: 30 kHz

    ****** Error: Could not find supported CPU core on JTAG chain
    Trying to connect with 5 kHz !


    ****** Error: Could not find supported CPU core on JTAG chain
    J-Link>
    // ----------- End of J-Link message --------