MUXF5

2-to-1 Lookup Table Multiplexer with General Output

MUXF5 provides a multiplexer function in one half of a Virtex or Spartan2 CLB for creating a function-of-5 lookup table or a 4-to-1 multiplexer in combination with the associated lookup tables. The local outputs (LO) from the two lookup tables are connected to the I0 and I1 inputs of the MUXF5. The S input is driven from any internal net. When Low, S selects I0. When High, S selects I1.

The variants, “MUXF5_D” and “MUXF5_L,” provide additional types of outputs that can be used by different timing models for more accurate pre-layout timing estimation.