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AR# 12746

4.1i XST - How do I apply the PERIOD and TIG timing constraints in XST?


General Description:

XST now supports PERIOD and TIG timing constraints, but there is no option in the ISE Project Navigator GUI to apply them to a design. How can I do this?


In XST 4.1i, PERIOD and TIG are only supported in the constraints file.

The syntax for apply these to a design is:

attribute PERIOD of my_signal: entity is "100MHz";

attribute TIG of my_signal: signal is "TIG";

For more information, please consult Chapter 3 of the XST User Guide, which is supplied with the ISE User Manual.

AR# 12746
Date Created 08/29/2007
Last Updated 03/24/2010
Status Archive
Type General Article