5.2.1:
Reading file hex2led.xnf ...
WARNING Signal led<3> is loadless. Assumed external output.

WARNING Signal hex<3> is not driven. Assumed external input.
WARNING Signal hex<2> is not driven. Assumed external input.
WARNING Signal hex<1> is not driven. Assumed external input.
WARNING Signal hex<0> is not driven. Assumed external input.
WARNING Signal led<0> is loadless. Assumed external output.

WARNING Signal led<1> is loadless. Assumed external output.

WARNING Signal led<4> is loadless. Assumed external output.

WARNING Signal led<5> is loadless. Assumed external output.

Starting check for combinatorial feedback cycles ... 

Starting logic simplification ...
Combinational logic reduced to 7 function generators.
Estimated no. of CLBs (combinational logic only) 4
Maximum LP2P 1

Maximum no. of levels is 1

Writing file hex2led.xnf ...

7 FMAPs generated