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TMS320F28377S: Adding XDS100v2 to a design

Steve Ling
Prodigy 360 points
Part Number: TMS320F28377S

A few questions about adding XDS100v2 to a board:

1 - Is it better to copy the XDS100v2 section of the LAUNCHXL-F28377S Overview User's Guide - Texas Instruments or the schematic here from the wiki http://processors.wiki.ti.com/index.php/XDS100?

2 - The the CPLD content at the same wiki link above the latest?  

3 - Are the isolators U5 and U7 on the LaunchPad required? 

4 - If 3.3V is already available on the board is there a concern with removing the VBUS to 3.3V regulator to power the FTDI device?  

  • 0
    TI__Guru 57255 points

    Hi Steve,

    1) Either is applicable.  The official one from the wiki site is a bit more robust (the CPLD takes care of boundary conditions), but both are proven.

    2) For the official version of xds100v2, all content on the wiki is the most up-to-date version.

    3) No.  However, it is very worthwhile to think through the isolation situation for your system.  If you will be running a power system and debugging simultaneously, I would recommend using isolation.  It can protect your computer from damage.  If isolation is not needed, the emulator circuitry can certainly become more simple.

    4) As long as isolation is not needed, no.  In this situation, the USB ground and the board ground should be connected.

    ===

    Note that in many situations, it is often easier to just put down a JTAG header, connect up to it as suggested in the datasheet, and then buy an external emulator.  An example is the following:
    http://www.ti.com/tool/TMDSEMU100V2U-14T

    If you then would like to add isolation, isolation adapters are also available for purchase.

    Going external often results in board space savings and reduced debug.  However, there are also valid reasons for putting the emulator on board. 

    The choice is yours.  :)


    Thank you,
    Brett