yosys/techlibs/xilinx/abc.box

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# Max delays from https://pastebin.com/v2hrcksd
# from https://github.com/SymbiFlow/prjxray/pull/706#issuecomment-479380321
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# F7BMUX slower than F7AMUX
# Inputs: I0 I1 S0
# Outputs: O
F7BMUX 1 1 3 1
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217 223 296
# Inputs: I0 I1 S0
# Outputs: O
MUXF8 2 1 3 1
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104 94 273
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MUXCY 3 1 3 1
1 1 1
XORCY 4 1 2 1
1 1