General Description: A Target Family setting of "Virtex-II" is available in the Project Options dialog in the 3.1i CORE Generator, but there do not appear to be any cores that actually support the Virtex-II architecture.
解决方案
The version of the CORE Generator shipped on the 3.1i CD does not include any cores that can be targeted to the Virtex-II architecture. Cores that support Virtex-II were first added with the D_IP1 release, which was released in July 2000
Cores that support Virtex architecture are generally not re-targetable to Virtex-II, due to differences in the format of the RLOC constraints that must be specified.