[ABANDONED] Loss of Voltage When Connected with J-Flash

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  • [ABANDONED] Loss of Voltage When Connected with J-Flash

    I am using a Segger JLink Pro. It is connected to an NXP iMX RT 1064 MCU.

    When I use J-Flash, v6.88c and connect, I get the following.

    Connecting ...
    - Connecting via USB to probe/ programmer device 0
    - Probe/ Programmer firmware: J-Link Pro V4 compiled Nov 12 2020 10:08:03
    - Device "MIMXRT1064XXX6A" selected.
    - Target interface speed: 4000 kHz (Fixed)
    - VTarget = 3.313V
    - InitTarget() start
    - InitTarget()
    - _TargetHalt: CPU halted
    - InitTarget() end
    - Found SW-DP with ID 0x0BD11477
    - DPIDR: 0x0BD11477
    - Scanning AP map to find all available APs
    - AP[1]: Stopped AP scan as end of AP map has been reached
    - AP[0]: AHB-AP (IDR: 0x04770041)
    - Iterating through AP map to find AHB-AP to use
    - AP[0]: Core found
    - AP[0]: AHB-AP ROM base: 0xE00FD000
    - CPUID register: 0x411FC271. Implementer code: 0x41 (ARM)
    - Found Cortex-M7 r1p1, Little endian.
    - FPUnit: 8 code (BP) slots and 0 literal slots
    - CoreSight components:
    - ROMTbl[0] @ E00FD000
    - ROMTbl[0][0]: E00FE000, CID: B105100D, PID: 000BB4C8 ROM Table
    - ROMTbl[1] @ E00FE000
    - ROMTbl[1][0]: E00FF000, CID: B105100D, PID: 000BB4C7 ROM Table
    - ROMTbl[2] @ E00FF000
    - ROMTbl[2][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7
    - ROMTbl[2][1]: E0001000, CID: B105E00D, PID: 000BB002 DWT
    - ROMTbl[2][2]: E0002000, CID: B105E00D, PID: 000BB00E FPB-M7
    - ROMTbl[2][3]: E0000000, CID: B105E00D, PID: 000BB001 ITM
    - ROMTbl[1][1]: E0041000, CID: B105900D, PID: 001BB975 ETM-M7
    - ROMTbl[1][2]: E0042000, CID: B105900D, PID: 004BB906 CTI
    - ROMTbl[0][1]: E0040000, CID: B105900D, PID: 000BB9A9 TPIU-M7
    - ROMTbl[0][2]: E0043000, CID: B105F00D, PID: 001BB101 TSG
    - Cache: Separate I- and D-cache.
    - I-Cache L1: 32 KB, 512 Sets, 32 Bytes/Line, 2-Way
    - D-Cache L1: 32 KB, 256 Sets, 32 Bytes/Line, 4-Way
    - Executing init sequence ...
    - Initialized successfully
    - Target interface speed: 4000 kHz (Fixed)
    - Found 1 JTAG device. Core ID: 0x0BD11477 (None)
    - Connected successfully

    About 10 seconds later I get this message

    WARNING: Supply voltage too low or too high, disconnecting target! VTarget = 0.000V
    Disconnecting ...
    - Disconnected

    Monitoring the Vref signal does show a drop in voltage.

    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Hl5qz1vK+M8zUjWztMsxzmawnmaka1+niZJcx3KnTRXo2Sa0GW8JClLX0oskU60y5NuYrXyxFrLQ6yUyH8sem39ja/yPbRfVFQUbWFhIS75cSz/m5NYv8rP8jJ8HFxDamF+Li4pLzUoFSuSZnmQNB2SZiSrSXOjrfeKQOmk/mNKGgjlsmPHDldBlGx6Kt+Xl9T2UFVVZdNluMymGoUrjZjIRl9Ji6QZ2fJJc9/+A0FJs7a23iYn870xFIsVVlNT6+KwNTeGUAXFobrGpqYm4pJ8KhYrbVt1tUua+Y5DRUWVVZVKNjM9GZfkk4brK13jYWZ6Ki7Jp8rKkm9IzcxszTgwEQgAgEAMz64Dw7MRLtgeYSJQJIsXbC8HhmcjW314lp4mAACBSJoAAAQiaQIAEIikCQBAIJImAACBSJoAAAQiaQIAEIikCQBAELP/B7kwKTEsAEHSAAAAAElFTkSuQmCC[/img]


    However if Vref is monitored without J-Flash connected, there is no voltage drop.

    The connected device is running, but 'idle'.

    There are two JTracePros connected, both via USB. The connection is a 10-pin connector using the 20-pin to 10-pin adapter.

    Any help on how to determine what is causing the voltage drop would be helpful.

    Keith Smith

    The post was edited 1 time, last by smithk726 ().