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The Xilinx Constraints Editor is a GUI tool provided in the Xilinx Development System for entering timing constraints and pin location constraints. The Constraints Editor's GUIs simplify constraint entry by guiding you through constraint creation without your needing to understand UCF file syntax.
The Constraints Editor automatically writes out a valid UCF file and a valid NGD file. These files are processed by the Map program, which generates a PCF file. Constraints created using the Xilinx Constraints Editor appear syntactically in the Editable Constraints list the same way they appear in the UCF.
A Constraints Editor "Example" section is included with each attribute/constraint description in the "Attributes and Logcal Constraints" section in this chapter. The Constraints Editor Example gives information on the appropriate Constraints Editor GUI, if one is available, to assist you with entry of that constraint. For a detailed description of how to use the editor, see the Constraints Editor Guide.