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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...
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):

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

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Regards,

Alex