4:1 Multiplexer
Each LUT can be configured into a 4:1 MUX. The 4:1 MUX can be implemented with a flip-flop in the same slice. Up to four 4:1 MUXes can be implemented in a slice, as shown in the following figure.
8:1 Multiplexer
Each slice has an F7AMUX and an F7BMUX. These two MUXes combine the output of two LUTs to form a combinatorial function up to 13 inputs (or an 8:1 MUX). Up to two 8:1 MUXes can be implemented in a slice, as shown in the following figure.
16:1 Multiplexer
Each slice has an F8MUX. F8MUX combines the outputs of F7AMUX and F7BMUX to form a combinatorial function up to 27 inputs (or a 16:1 MUX). Only one 16:1 MUX can be implemented in a slice, as shown in the following figure.
It is possible to create multiplexers wider than 16:1 across more than one SLICEM. However, there are no direct connections between slices to form these wide multiplexers.