BUFTs for Multiplexers

• BUFT can be used to build large MUXes

  • Wide MUXes composed of LUTs need multiple levels of logic
  • Wide MUXes composed of BUFTs have only one level of logic
    • CLB resources are not used

• Xilinx library BUFT components

  • BUFT, BUFT4, BUFT8, BUFT16

• Note: Multiplexer macros use Look-Up Tables

  • Example: M4_1E

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