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-rw-r--r--techlibs/ice40/cells.box7
1 files changed, 7 insertions, 0 deletions
diff --git a/techlibs/ice40/cells.box b/techlibs/ice40/cells.box
index e4cfb71e6..d775efa78 100644
--- a/techlibs/ice40/cells.box
+++ b/techlibs/ice40/cells.box
@@ -1,6 +1,13 @@
+# From https://github.com/cliffordwolf/icestorm/blob/81c33a3/icefuzz/timings_hx8k.txt
+
# NB: Inputs/Outputs must be ordered alphabetically
# Inputs: CI I0 I1
# Outputs: CO
SB_CARRY 1 1 3 1
126 259 231
+
+# Inputs: I0 I1 I2 I3
+# Outputs: O
+SB_LUT4 2 1 4 1
+316 379 400 449