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AM437x SYSBOOT pin external pullup/pulldown

Michi Yama
Guru 10030 points

Hi,

I have one question regarding sysboot pins of AM437x.

If some SYSBOOT pin for my boot does not influence, those pins does not need external pull up /down (level is floating).

For example, IF NAND boot is used, SYSBOOT [18, 16,11,9,5] pins are "don't care". Are these pins allowed the open?

Please advise me.

I appreciate your quick reply.

Best regards,

Michi 

  • 0
    TI__Guru**** 393215 points
    Hi,

    Yes, this is allowed.
  • 0 in reply to Biser Gatchev-XID
    TI__Guru 60775 points

    The answer Biser provided is partially true.

    The state of some SYSBOOT inputs may not be relevant for a specific boot mode and in this case they can be either a logic high or logic low.  However, you should never leave any inputs floating. Since the SYSBOOT inputs do not have internal pull resistors turned on by default, you must use external resistors to pull theses inputs to valid logic levels.

    Regards,
    Paul

  • 0 in reply to peaves
    Guru 10030 points
    Dear Paul-san,

    Thank you for your additional information.

    I will take care of all SYSBOOT inputs to keep valid logic levels.

    Best regards,
    Michi