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Stellaris JTAG problem

Discussion in 'Electronic Design' started by Marco Trapanese, Mar 11, 2012.

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  1. Hello,

    I have several boards that host LM3S* Stellaris MCU. They are different
    boards but the connections around the MCUs are the same.

    Some boards work fine and I can program the MCU using JTAG (LMI FTDI).
    Others don't work - LM Flash Programmer returns error while connecting.

    I might exclude a design error due to the working boards. Perhaps some
    problems during soldering.

    I checked:

    - power supply on MCU pins
    - RST and TRST pull-ups on MCU pins
    - JTAG connection (and pull-ups) between MCU pins and JTAG programmer
    - WAKE, CMOD0, CMOD1 logic levels on MCU pins

    What would you do further to find out the cause of the problem? I'm
    wondering about other measures or test I can do.

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