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Power ON state

patki.onkar
Intellectual 410 points

What will be the status of different pins when DSP is powered on and no program is loaded ?

Datasheet says about reset condition.. e.g. DDR_CS is high.  But is the condition of those IOs when powered up and no program is loaded or the status when program is loaded and that particular IO is not used ?

 

Regards,

Onkar

  • 0
    TI__Mastermind 41665 points

    In general if an I/O pin is not used it will retain the initial state it is given, however note that some peripherals will be initialized by the ROM boot loader code depending on your boot mode (such as the UART in a UART boot mode) which could change their values, additionally the later boot loaders (UBL, U-Boot) will also be initializing things and can change the value of any of the I/Os related to what they initialize. This being said you would have to look at the pins on a case by case basis after reset has been released, ensuring that none of the software you will run will inadvertently change the state.