diff --git a/artiq/gateware/targets/sayma_amc.py b/artiq/gateware/targets/sayma_amc.py
index db2387f73..6e2415d57 100755
--- a/artiq/gateware/targets/sayma_amc.py
+++ b/artiq/gateware/targets/sayma_amc.py
@@ -59,7 +59,7 @@ class AD9154CRG(Module, AutoCSR):
 
         platform.add_period_constraint(refclk_pads.p, 1e9/self.refclk_freq)
         self.specials += [
-            Instance("IBUFDS_GTE3", i_CEB=0, p_REFCLK_HROW_CK_SEL=0b00,
+            Instance("IBUFDS_GTE3", i_CEB=self.jreset.storage, p_REFCLK_HROW_CK_SEL=0b00,
                      i_I=refclk_pads.p, i_IB=refclk_pads.n,
                      o_O=self.refclk, o_ODIV2=refclk2),
             Instance("BUFG_GT", i_I=refclk2, o_O=self.cd_jesd.clk),
@@ -67,7 +67,11 @@ class AD9154CRG(Module, AutoCSR):
         ]
 
         jref = platform.request("dac_sysref")
-        self.specials += DifferentialInput(jref.p, jref.n, self.jref)
+        self.specials += Instance("IBUFDS_IBUFDISABLE",
+            p_USE_IBUFDISABLE="TRUE", p_SIM_DEVICE="ULTRASCALE",
+            i_IBUFDISABLE=self.jreset.storage,
+            i_I=jref.p, i_IB=jref.n,
+            o_O=self.jref)
 
 
 class AD9154JESD(Module, AutoCSR):