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LM4F111 debug trace header connections

Mario Willeit
Prodigy 550 points

Hello,

how should a LM4F111H5QR device be connected to the below debug/trace header ?
(series resistors, pullups, etc.)

Thank you in advance
Mario

 

 

  • 0
    TI__Mastermind 18905 points

    Mario,

    We use ARM standard pin-out for JTAG.  If you review the schematics you will find that they have ARM 10-pin standard or ARM 20-pin standard.  The implementation of the ARM 20-pin standard is for having the ability to do both Debug-in and Debug-out, with one of the pins (typically 18) to force debug-out giving the ability to use the on-board ICDI Jtag emulator for customer boards/designs.

    The EK-LM4F232 kit schematic shows TMS and TCK with external 10K pull-ups.  Note that this is a pre-cautionary recommendation, not a necessary implementation.  The JTAG pins on the LM4Fxxx devices have the internal pull-up enabled by default at power-on. 

    Are you planning on using trace?  We do not currently have any evaluation kits or reference design that implement trace.   However, if you refer to the LM4F232 data sheet there are some recommendations for the handling of reset when implementing trace.  Also note, the trace pins on the LM4F232 do not have internal pull-ups enabled by default.  I recommend you research the pin-out recommended by ARM, http://www.keil.com/ulink/.

    Lela