- Open the Timing Constraints window:
A tree view of the different types of constraints displays on the left side of the Timing Constraints window. This is a menu of timing constraints that can be quickly defined.
Notice the two clock constraints,
bftClk, displayed in the Timing Constraint spreadsheet on the right side of the Timing Constraints window. The values of currently defined constraints can be modified by directly editing them in the spreadsheet.
, as shown in the following figure.
- In the left hand tree view of the Timing Constraints window, double-click
Create Clock under the Clocks
category. Note: Expand the Clocks category if needed by clicking the +.
The Create Clock wizard opens, as shown in the following figure, to help you define clock constraints. Notice the Tcl Command line on the bottom displays the XDC command that will be executed.
Do not create or modify any timing constraints at this time.
- Click Cancel.
- Close the Timing Constraints window by clicking the X in the window
The Vivado Design Suite offers a variety of features for design analysis and constraint assignment. Other tutorials cover these features in detail, and they are only mentioned here. Feel free to examine some of the features under the Tools menu.