Statrix IV clock pins assigment (Terasic DE4 dev kit)

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But I believe that you're right.

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Don't just guess, use the tools to know!

The Quartus II tool generates a file;

Fitter->Pin Out

Look at that file. Also look at the setting for unused pins;

Assignments->Device, Device and Pin Options, Unused Pins.

The default for Stratix IV is "As input tri-stated with weak pull-up". However, for older devices this used to be "As output driving ground". So if you inherit an older project and blindly assume that unused pins are tri-stated by default, you could damage that board.

So, now you know :)

Cheers,

Dave