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Altera_Forum's avatar
Altera_Forum
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11 years ago

Unable to update property "Weak Pull-Up Resistor"

Hi,

I am trying to set assign an internal pull up resistor to an input on the Cyclone IV E: EP4CE15F23C8 on Quartus II 11.0. I have tried using both the assignment editor and the pin planner to accomplish this, but after compilation this critical error always appears: critical warning: unable to update property "weak pull-up resistor" of node "idestuffed". The pin I am trying to assign is pin L6, I have tried some other pins and most also experience the same problem, but pin K1 does not. I can't seem to find the difference between the two pins. Is there some way to remedy this or another way to pull up the signal.

Thanks in advance.

2 Replies

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

    Are you using (knowingly or otherwise) the bus-hold feature? From the "I/O Features in Cyclone IV Devices" (page 6-4):

    --- Quote Start ---

    If you enable the bus-hold feature, the device cannot use the programmable pull-up option.

    --- Quote End ---

    Regards,

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

    Thanks for the reply Alex. I have checked to make sure the bus-hold feature is off. Another thing I have noticed is that I do not receive the critical warning in Quartus 12.0 or Quartus 13.0. I would rather use Quartus 11.0, but if it's not possible I will have to port my project.