yosys/techlibs/ice40/cells.box

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# From https://github.com/cliffordwolf/icestorm/blob/81c33a3/icefuzz/timings_hx8k.txt
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# NB: Inputs/Outputs must be ordered alphabetically
# Inputs: CI I0 I1
# Outputs: CO
SB_CARRY 1 1 3 1
126 259 231
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# Inputs: I0 I1 I2 I3
# Outputs: O
SB_LUT4 2 1 4 1
316 379 400 449