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TMS320F28M35H52C clockout problem

Hello,

i have developped a new card with this microcontroller. I have encountered a problem with clockout (pin GPIO34).

I use a buffer to trasmit Clockout to other device and the CLockout pin are decupled with 10Ohm resistor. 

The card work fine but when i connect the emulator XDS100V2 the TMS320F28M35 hold in reset mode.

Then for an correct emulatio connection i must to diconnect the clockout pin.

Please help me.

  • Hi Luca,

    Have you already checked your board layout to make sure GPIO34 pin is not having any impact on TCK pin?

    Also I am assuming that it's not issue with just XDS100v2 emaultor but with any other emalator.

    Sorry for late reply.

    Regards,

    Vivek Singh

     

  • Hi Vivek,

    yes, the problem could be the layout, but i have verified that the only signal perturbed is EMU0 (pin 83). EMU0 pin is near XCLKOUT pin (GPIO34 pin 82).

    Another consideration . If  decoupling is a good choice, when    i connect  XCLKOUT pin with a 50Ohm series resistor the emulator work fine. If i increase or decrease this resistor the DSP hold in reset. This is strange? 

    It seems to work for luck.

    Regards

    Luca Guarda

  • Hi Luca,

    What error message you get in this case?

    On this device we have "Wait In Reset" mode. Device enters into this mode if EMU0/EMU1 pins are driven '0'/’1’'.  There is register on Master subsystem (MWIR) and on Control sub-system (CWIR) which has EMU0/EMU1 bit filed. These bit-fields show the latched values of EMU0/EMU1 pin. You could look at these registers to see what was the value latched from these pins.

    Regards,

    Vivek Singh