Only rise-rise of link_clk may already be enough.

applications/lofar2/designs/lofar2_unb2c_sdp_station/quartus/lofar2_unb2c_sdp_station.sdc

@@ -133,7 +133,7 @@ set_clock_groups -asynchronous -group [get_clocks {*xcvr_native_a10_0|g_xcvr_nat
 #     <------> = 5 - 0.496 = 4.504 ns --> 222 MHz
 #
 # Idem use same set_clock_uncertainty for fall-fall and fall_rise. Although
-# maybe only the rise-rise constraint is already sufficient.
+# maybe only the rise-rise constraint for link_clk is already sufficient.
 
 # 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