The first screen in the Device Selection Wizard allows you to set die, package, speed, and voltage.
In the Tools menu, choose Device Selection to start the Device Selection Wizard.
Select Die and Package. Select a die from the Die list. Available packages are listed for each die.
Specify Speed.
Select Die Voltage. Select from the available settings in the Die Voltage drop-down menu. Two numbers separated by a “/” are shown if mixed voltages are supported. If two voltages are shown, the first number is the I/O voltage and the second number is the core (array) voltage.
Click Next to set reserve pins and I/O Attributes.