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Recommended debug connector for TMS570LC

Etienne Alepins
Intellectual 775 points

Hi,

We are using the TMS570LC on a custom board development. We were not able to find an application note that tells the recommended connector to install on the PCB in order to have full debug capabilities (including ETM), for the maximum frequency of TMS570LC. Any help?

Thanks,

Etienne

  • 0
    TI__Guru 72500 points
    Which debug tool do you plan on using?
  • 0 in reply to Bob Crosby
    Intellectual 775 points
    iSystem iC5000

    Etienne
  • 0 in reply to Etienne Alepins
    TI__Guru 72500 points
    Sorry, not sure about iSystem. It may be the Mictor 38-pin ETM Connector but you better check with iSystem.
  • 0 in reply to Bob Crosby
    Intellectual 775 points
    Hi,

    Ok, but independently of the debugger, does ARM or Texas Instruments recommend a connector? For example, for the Nexus debug interface of some MPC5xxx MCUs, NXP recommends the Samtec ERF8 50 pins connector rather than the Mictor38, because of signal integrity reasons (high frequency I think). For Hercules, Mictor38 is the preferred choice as long as our debug probe supports it?

    Thanks,
    Etienne
  • 0 in reply to Etienne Alepins
    TI__Guru 72500 points
    I cannot speak for ARM, but here is a link to a TI trace tool:
    www.ti.com/.../TMDSEMUPROTRACE
    They refer to a MIPI HSPT 60-pin connector, but do not specify a particular brand.
  • 0 in reply to Bob Crosby
    TI__Guru 68920 points

    See

    Table 6 page 10.

    Table 6. Summary: MIPI 60-Pin Header Information

    1 Connector Manufacturer is Samtec USA.

    2 Connector Model Number is QSH030.

    3 Connector Specification Overview is located at URL

    .

    4 Connector Drawing is located at URL

    MKT.pdf.

    5 Connector Footprint Drawing is located at URL

    XX-FOOTPRINT.pdf.

    For the actual pinout with TM570 refer to the HDK schematics.  I think the lit # above shows several options like 2 smaller width ETM ports and it may be confusing.

    Note that the HDK doesnt' work well out of the box with the PROTRACE due to lack of termination on the ETM signal lines.

    For any new board designs please make sure to properly terminate the ETM traces going to the header.  

    Especially the ETM clock.  The PROTRACE attempts to find the eye of the trace clock during a calibration step (since the ETM is DDR clocked) and this circuitry can't handle the severe ringing that you get with the unterminated clock on the HDK.     I've had to cut the clock trace on the back of the HDK and tack down a source termination resistor to get this to work.

    Here's a photo of the rework job needed on the HDK to terminate the ETM clock line, usually a 33ohm resistor works well.