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Altera_Forum's avatar
Altera_Forum
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9 years ago

Reserve all unused pins: As input tri-stated with weak pull-up-Leds are glow faintly

Hello everyone,

i am new to FPGA programming.

I have set the unused pins to tri-stated with weak pull-up. As a result, all the unused LEDs are dim.

Is there a way to prevent this without having to assign the pins to the LEDs and set them to 0?

Thanks in advance and apologies for my english.

2 Replies

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

    How about adding this to your .qsf file instead:

    set_global_assignment -name RESERVE_ALL_UNUSED_PINS "AS OUTPUT DRIVING GROUND"
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    9 years ago

    Thank you very much for your answer.

    --- Quote Start ---

    How about adding this to your .qsf file instead:

    set_global_assignment -name RESERVE_ALL_UNUSED_PINS "AS OUTPUT DRIVING GROUND"

    --- Quote End ---

    The default setting of Quartus was 'as output driving ground' for the unused pins.

    By this setting, I received the warning, "The Reserve All Unused Pin Set has not been specified, and will default to As output driving ground."

    But I must avoid this warning.