The State Diagram Editor (StateCAD) has been deprecated in ISE 11.1. Xilinx will no longer be
making bug fixes or enhancements to State Diagram Editor or
upgrading to support new operating systems. As such, the sc.exe delivered in ISE
10.1 is the final version.
Users who desire to use the State Diagram Editor may use it as a standalone
application from an ISE 10.1installation.
From the State Diagram Editor, the user may generate HDL and use it as a source
file in an ISE 11.1 (or any other version) project.