diff --git a/library/axi_jesd_gt/axi_jesd_gt_constr.xdc b/library/axi_jesd_gt/axi_jesd_gt_constr.xdc
index e69de29bb..e8033e1c4 100644
--- a/library/axi_jesd_gt/axi_jesd_gt_constr.xdc
+++ b/library/axi_jesd_gt/axi_jesd_gt_constr.xdc
@@ -0,0 +1,16 @@
+set_false_path -from [get_cells -hier *up_xfer_toggle* -filter {primitive_subgroup == flop}]  -to [get_cells -hier *d_xfer_state* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *up_xfer_toggle* -filter {primitive_subgroup == flop}]  -to [get_cells -hier *d_xfer_toggle* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *up_count_toggle* -filter {primitive_subgroup == flop}] -to [get_cells -hier *d_count_toggle* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *d_xfer_toggle* -filter {primitive_subgroup == flop}]   -to [get_cells -hier *up_xfer_state* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *d_xfer_toggle* -filter {primitive_subgroup == flop}]   -to [get_cells -hier *up_xfer_toggle* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *d_count_toggle* -filter {primitive_subgroup == flop}]  -to [get_cells -hier *up_count_toggle* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *rx_sync* -filter {primitive_subgroup == flop}]         -to [get_cells -hier *up_rx_status_m1* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *up_rx_sysref* -filter {primitive_subgroup == flop}]    -to [get_cells -hier *rx_sysref_m1* -filter {primitive_subgroup == flop}]
+set_false_path -from [get_cells -hier *up_rx_sync* -filter {primitive_subgroup == flop}]      -to [get_cells -hier *rx_sync_m1* -filter {primitive_subgroup == flop}]
+set_false_path -to   [get_cells -hier *rst_p* -filter {primitive_subgroup == flop}]
+set_false_path -to   [get_cells -hier *rst* -filter {primitive_subgroup == flop}]
+ 
+set_max_delay -from [get_cells -hier *up_xfer_data* -filter {primitive_subgroup == flop}]  -to [get_cells -hier *d_data_cntrl* -filter {primitive_subgroup == flop}]     8.0
+set_max_delay -from [get_cells -hier *d_xfer_data* -filter {primitive_subgroup == flop}]   -to [get_cells -hier *up_data_status* -filter {primitive_subgroup == flop}]  20.0
+set_max_delay -from [get_cells -hier *d_count_hold* -filter {primitive_subgroup == flop}]  -to [get_cells -hier *up_d_count* -filter {primitive_subgroup == flop}]      20.0
+