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AM3358: datasheet clarification

Tom Schultz
Expert 4140 points
Part Number: AM3358

Team,

My customer has two questions related to the AM3358 datasheet.

1) On the AM3358 processor (ZCZ ball number), is it correct in that when device is powered up (e.g. On the Beagle Bone), that pin T7 highlighted in this datasheet snippet (table 4-2 pin attributes for ZCE and ZCZ packages), that during reset, the pin will be high and after reset, the pin will also be high?

2) Also, the Pullup/down column in the snippet. I see note 12, but is the pull up or pull down enabled internally when booted up just after reset before the firmware configures anything or are the pull-up and pull-downs disabled?

Thanks,

Tom

  • +1
    TI__Guru* 86820 points

    1. Yes, more precisely it will be pulled high during and after reset.  Note that the Boot ROM may change this depending on the boot sequence that is chosen, and also the ROM may drive this signal high or low if it needs it to boot in a certain mode.

    2.  i would say that column is fairly irrelevant, as it is just stating the presence of a pull up/down resistor (which most of the IO have anyway)

    For the most part, your customer should be concerned about the columns you asked about in question 1.  This will determine the state of the pin during and after reset.  If the boot ROM uses this pin (which can be determined by looking at the Initialization chapter in the TRM), then it may change before his software gets a chance to reconfigure it.  

    Regards,

    james

  • 0
    Prodigy 70 points

    Thank you, Tom and James!

  • 0 in reply to JJD
    Prodigy 70 points

    Thank you, Tom and James!