added ISE project file (*xise) because synthesis of VXS require
special configuration, otherwise ISE returns internal error.
This special configuration is added XST command line option:
" -use_new_parser yes". It can be added by clicking the top
hierarhy file (vxs_wr_ref_top.vhd) in the "Design Manager", the
right-click on "Synthesis -XST" in "Processes" window, from
drop menu chose "Process Properties - Synthesis Options" and
then input " -use_new_parser yes" on "Other XST Command Line
Options"