The Layers settings (shown in the following figure) control the elements displayed in the Package window.
Figure 1.
Package
Window—Layers Settings
The available layers are listed hierarchically in a tree view:
- Use the expand
and collapse 
buttons to expand or collapse the
levels of the tree view to see the different layers. - Click a check box to enable or disable the layer for display in the
Package window. A check mark indicates
the currently displayed layer. You can display or hide:
- Groups of objects by clicking the category of the objects
- Individual objects by selecting the item directly
Tip: You can use the Shift key to select multiple layers,
and use the Space bar to toggle the selected layers on or
off.
The display of a specific pin in the Package window depends on the combination of layers that represent the pin in the Package window settings. For example, if you deselect I/O Banks in the Package window settings, ground pins are displayed, but the user I/O and multi-function pins are not displayed even if you select I/O and Multi-Function Pins under the Pins heading.
Important: If a specific pin is not
visible in the Package window, you cannot
assign a port to it. Check that both the pin and the I/O block it is contained in are
selected for display in the Package window
settings.
Following are the different categories of layers in the Package window settings:
- I/O Ports
- Ports in the design that are currently placed in either a fixed or unfixed state. The design might have currently unplaced ports that are not displayed in the Package window.
- Pins
- Available package pins grouped into specific categories, such as multifunction
pins, power pins, and unconnected pins. Pins display as follows:
- Power pins display separately from the I/O banks.
- Multifunction pins display as part of the I/O bank they are contained
in, and display with symbols representing their available functions. For
example:
- Basic I/O pins display as gray circles by default.
- Clock capable pins display as blue hexagons by default.
- VREF, VRP, and VRN pins display
with a small power icon by default.
- The remaining pins display with an asterisk (*) and are not displayed by default.
- Basic I/O pins display as gray circles by default.
- I/O Bank Types
- Different types of I/O banks, which vary based on the targeted device. For
example, the following figure shows the high performance banks that are
displayed when you select the High
Performance layer.Figure 2. High-Performance I/O Bank
- I/O Banks
- Pin sites for each of the banks on the device as well as for the GT pins. Each
I/O bank and GT bank is color-coded to allow you to differentiate between the
banks of pins.Tip: Turning off an I/O bank layer is an easy way to prevent pin assignment. Using this method enables you to reserve a bank for later use or show that a bank is full.
- Other
- Grid lines for x-axis and y-axis drawn behind the sites.