--- a/draft.xdc
+++ b/draft.xdc
@@ -3,7 +3,7 @@
 set_property -dict { PACKAGE_PIN AF14 IOSTANDARD LVDS } [get_ports {RF_SYSREF_P}]
 set_property -dict { PACKAGE_PIN AE14 IOSTANDARD LVDS } [get_ports {RF_SYSREF_N}]
 set_property -dict { PACKAGE_PIN AA12 IOSTANDARD LVCMOS18 } [get_ports {RF_STATUS_DRV}]
-set_property -dict { PACKAGE_PIN AB19 IOSTANDARD LVCMOS18 } [get_ports {DDR4_CKE}]
+set_property -dict { PACKAGE_PIN AC19 IOSTANDARD SSTL12 } [get_ports {DDR4_CKE}]
 set_property -dict { PACKAGE_PIN AD19 IOSTANDARD POD12 } [get_ports {DDR4_DQ[0]}]
 set_property -dict { PACKAGE_PIN AE19 IOSTANDARD DIFF_POD12 } [get_ports {DDR4_DQS_P}]
 set_property -dict { PACKAGE_PIN AF19 IOSTANDARD DIFF_POD12 } [get_ports {DDR4_DQS_N}]