Assigning ports to pins

I/O Attribute Editor (v6.2 and higher) includes a Package Pins view in addition to its Ports view. Click the Package Pins tab to display your I/O attributes by pin number. This view makes it much easier to assign address/data ports to adjacent pins. Additionally, it enables you to assign VREF pins (which you cannot do in Ports view) and to sort on banks.

Package Pins View

The Package Pins View displays all columns shown in the Ports view plus the following additional columns:

• Function

• Dedicated

• VREF

Function is the functionality of the I/O (for example, GND or ground). See the datasheet for your device for details about each function.

Dedicated determines whether the pin is reserved for another use.

VREF (Voltage referenced), if checked, assigns the selected pin as a VREF. This column only appears for devices that support VREF (Fusion, ProASIC3E, and Axcelerator). A device supports VREF if one or more of its I/O banks support VREF.

Note:  You must assign VREF pins to Fusion, ProASIC3E, and Axcelerator devices before running Layout.