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-rw-r--r--techlibs/ice40/synth_ice40.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/techlibs/ice40/synth_ice40.cc b/techlibs/ice40/synth_ice40.cc
index b3d30791a..78ac5ea13 100644
--- a/techlibs/ice40/synth_ice40.cc
+++ b/techlibs/ice40/synth_ice40.cc
@@ -345,7 +345,7 @@ struct SynthIce40Pass : public ScriptPass
}
run("clean");
run("ice40_unlut");
- run("opt_lut -dlogic SB_CARRY:I0=1:I1=2:CI=3");
+ run("opt_lut -dlogic SB_CARRY:I0=2:I1=1:CI=0");
}
if (check_label("map_cells"))