diff --git a/database/virtex7/segbits_clblm_l.db b/database/virtex7/segbits_clblm_l.db
index 3a9b0f5a..e02f986a 100644
--- a/database/virtex7/segbits_clblm_l.db
+++ b/database/virtex7/segbits_clblm_l.db
@@ -718,7 +718,7 @@ CLBLM_L.SLICEM_X0.DLUT.SMALL 01_59
 CLBLM_L.SLICEM_X0.DLUT.SRL 30_47
 CLBLM_L.SLICEM_X0.DOUTMUX.CY 30_51 30_52 !30_56 !30_57
 CLBLM_L.SLICEM_X0.DOUTMUX.D5Q !30_51 !30_52 !30_56 30_57
-CLBLM_L.SLICEM_X0.DOUTMUX.MC31 30_10 !30_51 30_52 !30_56 30_57
+CLBLM_L.SLICEM_X0.DOUTMUX.MC31 !30_51 30_52 !30_56 30_57
 CLBLM_L.SLICEM_X0.DOUTMUX.O5 !30_51 30_52 30_56 !30_57
 CLBLM_L.SLICEM_X0.DOUTMUX.O6 !30_51 !30_52 30_56 !30_57
 CLBLM_L.SLICEM_X0.DOUTMUX.XOR 30_51 !30_52 !30_56 !30_57
diff --git a/database/virtex7/segbits_clblm_r.db b/database/virtex7/segbits_clblm_r.db
index 67f11711..28073c3a 100644
--- a/database/virtex7/segbits_clblm_r.db
+++ b/database/virtex7/segbits_clblm_r.db
@@ -718,7 +718,7 @@ CLBLM_R.SLICEM_X0.DLUT.SMALL 01_59
 CLBLM_R.SLICEM_X0.DLUT.SRL 30_47
 CLBLM_R.SLICEM_X0.DOUTMUX.CY 30_51 30_52 !30_56 !30_57
 CLBLM_R.SLICEM_X0.DOUTMUX.D5Q !30_51 !30_52 !30_56 30_57
-CLBLM_R.SLICEM_X0.DOUTMUX.MC31 30_10 !30_51 30_52 !30_56 30_57
+CLBLM_R.SLICEM_X0.DOUTMUX.MC31 !30_51 30_52 !30_56 30_57
 CLBLM_R.SLICEM_X0.DOUTMUX.O5 !30_51 30_52 30_56 !30_57
 CLBLM_R.SLICEM_X0.DOUTMUX.O6 !30_51 !30_52 30_56 !30_57
 CLBLM_R.SLICEM_X0.DOUTMUX.XOR 30_51 !30_52 !30_56 !30_57
diff --git a/utils/mergedb.sh b/utils/mergedb.sh
index add3db6d..2cc1ac7a 100755
--- a/utils/mergedb.sh
+++ b/utils/mergedb.sh
@@ -127,6 +127,12 @@ case "$1" in
 	liob18)
 		sed < "$2" > "$tmp1" -e 's/^IOB18\./LIOB18./' ;;
 
+	riob18_sing)
+		sed < "$2" > "$tmp1" -e 's/^IOB18\./RIOB18_SING./' ;;
+
+	liob18_sing)
+		sed < "$2" > "$tmp1" -e 's/^IOB18\./LIOB18_SING./' ;;
+
 	mask_liob18)
 		sed < "$2" > "$tmp1" -e 's/^IOB18\./LIOB18./' ;;