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-rw-r--r--techlibs/xilinx/abc_xc7.box5
1 files changed, 3 insertions, 2 deletions
diff --git a/techlibs/xilinx/abc_xc7.box b/techlibs/xilinx/abc_xc7.box
index b1c24ed24..7fe8a7236 100644
--- a/techlibs/xilinx/abc_xc7.box
+++ b/techlibs/xilinx/abc_xc7.box
@@ -23,8 +23,9 @@ MUXF78 3 1 6 1
# Inputs: CYINIT DI0 DI1 DI2 DI3 S0 S1 S2 S3 CI
# Outputs: O0 O1 O2 O3 CO0 CO1 CO2 CO3
# (NB: carry chain input/output must be last
-# input/output and have been moved there
-# overriding the alphabetical ordering)
+# input/output and the entire bus has been
+# moved there overriding the otherwise
+# alphabetical ordering)
CARRY4 4 1 10 8
482 - - - - 223 - - - 222
598 407 - - - 400 205 - - 334