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+# From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_lp8k.txt
+
+# NB: Box inputs/outputs must each be in the same order
+# as their corresponding module definition
+# (with exceptions detailed below)
+
+# Box 1 : $__ICE40_CARRY_WRAPPER (private cell used to preserve
+# SB_LUT4+SB_CARRY)
+# (Exception: carry chain input/output must be the
+# last input and output and the entire bus has been
+# moved there overriding the otherwise
+# alphabetical ordering)
+# name ID w/b ins outs
+$__ICE40_CARRY_WRAPPER 1 1 5 2
+#A B I0 I3 CI
+589 558 661 465 465 # O
+675 609 - - 186 # CO