General Description: The Alliance 2.1i DesignWare libraries were compiled with Synopsys Compiler version 1998.08. In order to use these libraries with an older version of Synopsys, you must have the libraries re-compiled with that version of Synopsys software.
Solution
The XSI 2.1i libraries compiled with Compiler 1998.02 and 1997.08 have been placed on the Xilinx FTP site. The README explains how to extract these libraries into your existing Xilinx software environment or a new location.