FATAL_ERROR:MapLib:.c:528:1.33 - simulate to inv, but no in pin.
Process will terminate. For technical support on this issue, please open a
WebCase with this project attached at http://www.xilinx.com/support.
This error might be due to the incorrect trimming of the LUT6_2 or of the feedback path in the circuit.
setenv XIL_MAP_LUT6_2_NO_OPTIMIZATIONS 1
setenv XIL_MAP_BOOT_CYCLE_POP_COMPLEX 1
Windows:
SET XIL_MAP_LUT6_2_NO_OPTIMIZATIONS=1
SET XIL_MAP_BOOT_CYCLE_POP_COMPLEX=1