Here are the new I/O standards:
DIFF_HSTL_II
DIFF_HSTL_II_18
DIFF_SSTL2_II
DIFF_SSTL18_II
DIFF_HSTL_II_DCI
DIFF_HSTL_II_DCI_18
DIFF_SSTL2_II_DCI
DIFF_SSTL18_II_DCI
HSLVDCI_15
HSLVDCI_18
HSLVCDI_25
HSLVDCI_33
This problem has been fixed in the latest 7.1i Service Pack available at:
http://support.xilinx.com/xlnx/xil_sw_updates_home.jspThe first service pack containing the fix is 7.1i Service Pack 1.