2 files changed, 2 insertions, 1 deletions
diff --git a/techlibs/xilinx/cells_xtra.py b/techlibs/xilinx/cells_xtra.py
index 749b1e0a7..f086291ab 100644
--- a/techlibs/xilinx/cells_xtra.py
+++ b/techlibs/xilinx/cells_xtra.py
@@ -302,7 +302,7 @@ CELLS = [
     Cell('IOBUF_DCIEN', port_attrs={'IO': ['iopad_external_pin']}),
     Cell('IOBUF_INTERMDISABLE', port_attrs={'IO': ['iopad_external_pin']}),
     Cell('IOBUFE3', port_attrs={'IO': ['iopad_external_pin']}),
-    Cell('IOBUFDS', port_attrs={'IO': ['iopad_external_pin']}),
+    Cell('IOBUFDS', port_attrs={'IO': ['iopad_external_pin'], 'IOB': ['iopad_external_pin']}),
     Cell('IOBUFDS_DCIEN', port_attrs={'IO': ['iopad_external_pin'], 'IOB': ['iopad_external_pin']}),
     Cell('IOBUFDS_INTERMDISABLE', port_attrs={'IO': ['iopad_external_pin'], 'IOB': ['iopad_external_pin']}),
     Cell('IOBUFDS_DIFF_OUT', port_attrs={'IO': ['iopad_external_pin'], 'IOB': ['iopad_external_pin']}),
diff --git a/techlibs/xilinx/cells_xtra.v b/techlibs/xilinx/cells_xtra.v
index ac4ad4e36..3021f6b5a 100644
--- a/techlibs/xilinx/cells_xtra.v
+++ b/techlibs/xilinx/cells_xtra.v
@@ -7072,6 +7072,7 @@ module IOBUFDS (...);
     output O;
     (* iopad_external_pin *)
     inout IO;
+    (* iopad_external_pin *)
     inout IOB;
     input I;
     input T;