yosys/techlibs/xilinx/abc_xc7.box

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# Max delays from https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf
# NB: Inputs/Outputs must be ordered alphabetically
# (with exceptions for carry in/out)
# Average across F7[AB]MUX
# Inputs: I0 I1 S0
# Outputs: O
F7MUX 1 1 3 1
204 208 286
# Inputs: I0 I1 S0
# Outputs: O
MUXF8 2 1 3 1
104 94 273
# Inputs: I0 I1 I2 I3 S0 S1
# Outputs: O
MUXF78 10 1 6 1
190 193 217 223 296 273
# CARRY4 + CARRY4_[ABCD]X
# Inputs: CYINIT DI0 DI1 DI2 DI3 S0 S1 S2 S3 CI
# Outputs: O0 O1 O2 O3 CO0 CO1 CO2 CO3
# (NB: carry chain input/output must be last
# input/output and have been moved there
# overriding the alphabetical ordering)
CARRY4 3 1 10 8
482 - - - - 223 - - - 222
598 407 - - - 400 205 - - 334
584 556 537 - - 523 558 226 - 239
642 615 596 438 - 582 618 330 227 313
536 379 - - - 340 - - - 271
494 465 445 - - 433 469 - - 157
592 540 520 356 - 512 548 292 - 228
580 526 507 398 385 508 528 378 380 114