By default, the fitter will automatically select a Xilinx device for you, choosing, in general, the smallest part that will satisfy the needs and constraints of your design.
After you have opened a design, select New Device from the Implementation menu; the device selection menu appears, as shown in the “Device Selection Menu” figure.
Figure 3.1 Device Selection Menu |  |
From this menu, select XC9500 or XC9500XL as the family. Then specify the target device parameters that you want for your design. For example if you choose "All" for all Filters fields the software is free to choose any device in the selected family.
If you select All for any device Filters field the software tries to fit your design within the range of possible devices you have selected by using the following selection criteria:
The software will continue to try fitting your design into one of the possible range of selected devices until the first usable one is found or until there are no more devices to try.
You can also specify a part number in your schematic. Place a CONFIG symbol in your schematic and apply the following attribute to it:
part=dddd-ss-pppp
When you open the Part Selector menu in the Design Manager, the Family, Device Package and Speed will all be set to the values you specified in your schematic. You can override these values using the Part Selector menu. The value of the PART attribute in a schematic must be a complete specific part value; you cannot use wildcards.
