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The FPGA Editor is a graphical application for displaying and configuring Field Programmable Gate Arrays (FPGAs). You can use this application to place and route critical components before running the automatic place and route tools on your design. You can also use the FPGA Editor to manually finish placement and routing if the routing program does not completely route your design.
The FPGA Editor requires a Native Circuit Description (NCD) file. This file contains the logic of your design mapped to components (such as CLBs and IOBs). In addition, the FPGA Editor reads from and writes to a Physical Constraints File (PCF).