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-rw-r--r--techlibs/ecp5/abc_5g.box9
1 files changed, 8 insertions, 1 deletions
diff --git a/techlibs/ecp5/abc_5g.box b/techlibs/ecp5/abc_5g.box
index 72af6d9cb..c757d137d 100644
--- a/techlibs/ecp5/abc_5g.box
+++ b/techlibs/ecp5/abc_5g.box
@@ -1,5 +1,12 @@
+# 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 bus has been moved
+# there overriding the otherwise
+# alphabetical ordering)
# name ID w/b ins outs
CCU2C 1 1 9 3
@@ -9,7 +16,7 @@ CCU2C 1 1 9 3
516 516 516 516 412 412 278 278 43
# Box 2 : TRELLIS_DPR16X4 (16x4 dist ram)
-# Outputs: DO0, DO1, DO2, DO3, DO4
+# Outputs: DO0, DO1, DO2, DO3
# name ID w/b ins outs
TRELLIS_DPR16X4 2 0 14 4