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TMS570LS3137- Bootup issue.

Hi,

We have configured ECLK  to 1.25Khz, After a sudden power off and power on, for certain duration ECLK is showing frequency of 40Hz(when we trace back, VCLK is 2.4Mhz and system freq is VCLK*2 = 5Mhz).

This is happening randomly.

Then we configured ECLK to 5Khz, after sudden power off and power on , ECLK was changing to 156.25Hz for some duration(156 Hz -> VCLK = 2.4Mhz, system freq is 5Mhz).

It was found that, when LPO was disabled in boot code, this problem dint occur.

Pls. suggest why is the device behaving like this when LPO is enabled?

Regards,

Archana

  • Here are few Hardware details:It is our custom board,
    Oscillator is external of freq-16Mhz.
    OSCOUT pin is left open, 16MHz external clock source is connected
    to OSCIN pin, KELVIN_GND is connected to Digitial GND.
    16MHz clock source is enbledbefore 10msec of nPORST assert high.
    In Boot code We are enabling LPO Oscillator and configuring as below:
    LFTRIM= 60.86HFTRIM =65.92BIAS ENABLE = 1
    Pls. check if these configurations are fine. Or anything else should be done in the case of above mentioned external oscillator?
  • Archana,

    I believe that there is something wrong in your oscillator circuit. The MCU does not see the signal from the oscillator. Please the check the OSCIN fail flag in the system register. I am pretty sure that it is on.

    Thanks and regards,

    Zhaohong