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To reserve for a specific use all unused pins on the device selected for the current Compiler settings:  More Details

1. If you have not already done so, create a new project or open an existing project.

2. If you have not already done so, specify the current Compiler settings.

3. If you have not already done so, specify the design entity you want to compile.

4. Choose Settings (Assignments menu).  Shortcut

5. In the Category list, select Device under Compiler Settings.

6. In the Device & Pin Options dialog box, click Device & Pin Options.

7. Click the Unused Pins tab.

8. Under Reserve all unused pins, select As inputs, tri-stated, As outputs, driving ground, or As outputs, driving an unspecified signal.

9. If you want to reset the option in the tab to its original setting, click Reset.

10. Click OK.

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