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-rw-r--r--techlibs/ice40/cells_sim.v4
1 files changed, 2 insertions, 2 deletions
diff --git a/techlibs/ice40/cells_sim.v b/techlibs/ice40/cells_sim.v
index 317ae2c1f..c7e4101e1 100644
--- a/techlibs/ice40/cells_sim.v
+++ b/techlibs/ice40/cells_sim.v
@@ -136,8 +136,8 @@ module SB_LUT4 (output O, input I0, I1, I2, I3);
assign O = I0 ? s1[1] : s1[0];
endmodule
-(* abc_box_id = 1, abc_carry, lib_whitebox *)
-module SB_CARRY ((* abc_carry_out *) output CO, input I0, I1, (* abc_carry_in *) input CI);
+(* abc_box_id = 1, abc_carry="CI,CO", lib_whitebox *)
+module SB_CARRY (output CO, input I0, I1, CI);
assign CO = (I0 && I1) || ((I0 || I1) && CI);
endmodule