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Power on reset of DaVinci

Piyush3178
Prodigy 20 points

 

Hi,

In design of DaVinci, I kept POR of DSP high with power supply and before 27Mhz clock which is against the datasheet. So I go thorough other cycle of POR and warm reset to correct the sequence. What about Silicon behavior if I dont follow POR with power up but take care the same after few seconds of power? Is there any document which describes internal usage of POR by Silicon itself? I am interested to know what Silicon does with power and POR.

Thanks,

Piyush

 

  • 0
    TI__Guru*** 125430 points

    The device would be powering up in an undefined mode of operation so there's no telling what it might do.  For instance, the I/O pins may come up in a funny state, e.g. driving/glitching when they should be High-Z.  The POR signal resets the entire device so that should get things back into proper order again.  However, any I/O glitches may have affected other devices on your board.  For example, if an I2C pin glitched then an I2C slave might think it just received the first bit of a transaction and so its state machine would be goofed up.

    This is not a mode of operation we recommend.

    Brad