techlibs/ice40/abc_u.box

   1 # From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_up5k.txt
   2
   3 # NB: Inputs/Outputs must be ordered alphabetically
   4 #     (with exceptions for carry in/out)
   5
   6 # Inputs: I0 I1 CI
   7 # Outputs: CO
   8 #   (NB: carry chain input/output must be last
   9 #        input/output and have been moved there
  10 #        overriding the alphabetical ordering)
  11 SB_CARRY 1 1 3 1
  12 675 609 278
  13
  14 # Inputs: I0 I1 I2 I3
  15 # Outputs: O
  16 SB_LUT4 2 1 4 1
  17 1285 1231 1205 874