Ports Tab Window

The top portion of the Ports tab window is composed of a grid. The two leftmost columns of the grid contain the user names of all current ports and each port's direction (input, output, or bidirectional). The other columns enable you to lock any user-defined port to a specified package pin (Location) and to enter any clock-specific constraint (Pad to Setup and Clock to Pad).

Located near the bottom of the Ports tab window are an I/O Configuration Options check box, a Prohibit I/O Locations button, and a field for selecting and creating pad groups, all of which are described briefly here.

Figure 1.4 Ports Tab Window

I/O Configuration Options toggle box - When you click the empty box, a check mark appears in this box, and a number of additional columns (depending on the target device) are added to the grid in the Ports tab window, such as FAST/SLOW seen in the “Ports Tab Window” figure. For details on the additional columns, see the “I/O Configuration Options” section in the "Using the Constraints Editor" chapter.

Prohibit I/O Locations button - disallows an I/O location for use by PAR (Place and Route) and FPGA Editor

Pad Groups - enables you to create or select pad groups to which a constraint can be applied.

The “Ports Tab Window” section in the "Windows and Dialog Boxes" chapter gives you more information on using the ports tab window.