General Description: BitGen supports the DONE_cycle:keep option. However, this option is not available in the Project Navigator Project Properties for BitGen.
Solution
The DONE_cycle:keep option has been added to the Project Navigator Project Properties for BitGen in the latest 7.1i Service Pack available at: http://support.xilinx.com/xlnx/xil_sw_updates_home.jsp The first service pack containing the new GUI option is 7.1i Service Pack 1.