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| XC3000 | XC4000E | XC4000X | XC5200 | XC9000 | Spartan | SpartanXL | Spartan2 | Virtex |
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| N/A | N/A | N/A | N/A | N/A | N/A | N/A | Primitive | Primitive |
BUFCF is a single fast connect buffer used to connect the outputs of the LUTs and some dedicated logic directly to the input of another LUT. Using this buffer implies CLB packing. No more than four LUTs may be connected together as a group.