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Altera_Forum's avatar
Altera_Forum
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9 years ago

erased MAX10, I/Os condition

hello.

I have a design that use MAX10. i noticed that every time I flash it, many I/Os (if not all of them) are going high, according to the documents, the pins should be tri-stated.

so first question is, is this phenomenon described anywhere? i couldn't find it...

second question, is there any way to avoid this (not talking about adding pull down resistors to my design, try to avoid this).

thanks

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    Hi Gilad, how are set pin on pin planner?

    All pin goes high or just some?

    Are you using a development board or your own?

    Best regards
  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    All unused pins will show the state defined under Assignments/Device/Device and Pin Options/Unused Pins, which is by default "Tri-stated with weak pull-up".

    There should be no unused IO pins with different behavior.
  • Altera_Forum's avatar
    Altera_Forum
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    9 years ago

    assume, a brand new chip of max10,when powered up, how will the io pins perform????????!!!!!!!

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    9 years ago

    --- Quote Start ---

    assume, a brand new chip of max10,when powered up, how will the io pins perform????????!!!!!!!

    --- Quote End ---

    If chip is brand new or better when is erased with confign low all pin appear as tristate weak pullup.