diff --git a/library/axi_ad9739a/axi_ad9739a_constr.xdc b/library/axi_ad9739a/axi_ad9739a_constr.xdc
new file mode 100755
index 000000000..e65318386
--- /dev/null
+++ b/library/axi_ad9739a/axi_ad9739a_constr.xdc
@@ -0,0 +1,6 @@
+
+set_false_path -from [get_cells *d_xfer_* -hierarchical -filter {PRIMITIVE_SUBGROUP == flop}] \
+  -to [get_cells *up_* -hierarchical -filter {PRIMITIVE_SUBGROUP == flop}]
+set_false_path -from [get_cells *up_xfer_* -hierarchical -filter {PRIMITIVE_SUBGROUP == flop}] \
+  -to [get_cells *d_xfer_* -hierarchical -filter {PRIMITIVE_SUBGROUP == flop}]
+