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-rw-r--r--techlibs/ecp5/abc_5g.box6
1 files changed, 6 insertions, 0 deletions
diff --git a/techlibs/ecp5/abc_5g.box b/techlibs/ecp5/abc_5g.box
index 72af6d9cb..15e26b5d5 100644
--- a/techlibs/ecp5/abc_5g.box
+++ b/techlibs/ecp5/abc_5g.box
@@ -1,5 +1,11 @@
+# NB: Inputs/Outputs must be ordered alphabetically
+# (with exceptions for carry in/out)
+
# Box 1 : CCU2C (2xCARRY + 2xLUT4)
# Outputs: S0, S1, COUT
+# (NB: carry chain input/output must be last
+# input/output and have been moved there
+# overriding the alphabetical ordering)
# name ID w/b ins outs
CCU2C 1 1 9 3