Altera FPGAs permit some pins to be dual-purpose pins. Two pins in this design are dual purpose pins.

Select the Assignments → Device menu then click Device and Pin Options.

Select the Dual-Purpose Pin tab. If necessary, change the settings in the Value column as shown in Figure 8.30.

Figure 8.30. Quartus II Device and Pin Options dialog

Click OK and then click OK again to return to Quartus.