Error: Cell <name> fed by 5 non-global control signals ...

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What you can do is go into assignment editor, place the Net in the "To" field, set Assignment Name to "Global Signal", and Value as "Global" or "Regional" or whatever you have available to your specific fpga family.

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Thanks for your suggestion.

I have set the Assignment Name to "Global Signal" and the only option ("Value") selectable is "Global Clock". But I still get the same errors.

By the way, I use Cyclone IV and Quartus 11.0 SP1.