diff --git a/applications/lofar2/designs/lofar2_unb2b_sdp_station/quartus/lofar2_unb2b_sdp_station.sdc b/applications/lofar2/designs/lofar2_unb2b_sdp_station/quartus/lofar2_unb2b_sdp_station.sdc
index ce015b6d6219689533c9506e2b06f5c25c83e9ef..24c9eaf9540dcc1128264503ae15fe2493d8a661 100644
--- a/applications/lofar2/designs/lofar2_unb2b_sdp_station/quartus/lofar2_unb2b_sdp_station.sdc
+++ b/applications/lofar2/designs/lofar2_unb2b_sdp_station/quartus/lofar2_unb2b_sdp_station.sdc
@@ -97,8 +97,22 @@ set_clock_groups -asynchronous -group [get_clocks {*xcvr_native_a10_0|g_xcvr_nat
 #-group [get_clocks {inst2|xcvr_4ch_native_phy_inst|xcvr_native_a10_0|g_xcvr_native_insts[?]|rx_pma_clk}] \
 #-group [get_clocks {inst2|xcvr_pll_inst|xcvr_fpll_a10_0|tx_bonding_clocks[0]}]
 
+# JESD
+
+# Increase clock uncertainty to force link_clk to have Fmax > 234MHz
+set_clock_uncertainty -rise_from [get_clocks {*|iopll_0|link_clk}] -rise_to [get_clocks {*|iopll_0|link_clk}]  5.727  
+set_clock_uncertainty -rise_from [get_clocks {*|iopll_0|link_clk}] -fall_to [get_clocks {*|iopll_0|link_clk}]  5.727  
+set_clock_uncertainty -fall_from [get_clocks {*|iopll_0|link_clk}] -rise_to [get_clocks {*|iopll_0|link_clk}]  5.727  
+set_clock_uncertainty -fall_from [get_clocks {*|iopll_0|link_clk}] -fall_to [get_clocks {*|iopll_0|link_clk}]  5.727 
+
+# Increase clock uncertainty to force frame_clk to have Fmax > 222MHz
+set_clock_uncertainty -rise_from [get_clocks {*|iopll_0|frame_clk}] -rise_to [get_clocks {*|iopll_0|frame_clk}]  0.496  
+set_clock_uncertainty -rise_from [get_clocks {*|iopll_0|frame_clk}] -fall_to [get_clocks {*|iopll_0|frame_clk}]  0.496  
+set_clock_uncertainty -fall_from [get_clocks {*|iopll_0|frame_clk}] -rise_to [get_clocks {*|iopll_0|frame_clk}]  0.496  
+set_clock_uncertainty -fall_from [get_clocks {*|iopll_0|frame_clk}] -fall_to [get_clocks {*|iopll_0|frame_clk}]  0.496 
+
 # false paths added for the jesd interface as these clocks are independent.
-set_false_path -from [get_clocks {*xcvr_fpll_a10_0|outclk2}] -to [get_clocks {*iopll_0|link_clk}]
-set_false_path -from [get_clocks {*iopll_0|link_clk}] -to [get_clocks {*xcvr_fpll_a10_0|outclk2}]
-set_false_path -from [get_clocks {*xcvr_fpll_a10_0|outclk2}] -to [get_clocks {*iopll_0|frame_clk}]
-set_false_path -from [get_clocks {*iopll_0|frame_clk}] -to [get_clocks {*xcvr_fpll_a10_0|outclk2}]
+#set_false_path -from [get_clocks {*xcvr_fpll_a10_0|outclk2}] -to [get_clocks {*iopll_0|link_clk}]
+#set_false_path -from [get_clocks {*iopll_0|link_clk}] -to [get_clocks {*xcvr_fpll_a10_0|outclk2}]
+#set_false_path -from [get_clocks {*xcvr_fpll_a10_0|outclk2}] -to [get_clocks {*iopll_0|frame_clk}]
+#set_false_path -from [get_clocks {*iopll_0|frame_clk}] -to [get_clocks {*xcvr_fpll_a10_0|outclk2}]