diff --git a/projects/common/a10soc/a10soc_system_assign.tcl b/projects/common/a10soc/a10soc_system_assign.tcl
index cf2a0cc10..a053c3136 100644
--- a/projects/common/a10soc/a10soc_system_assign.tcl
+++ b/projects/common/a10soc/a10soc_system_assign.tcl
@@ -12,11 +12,6 @@ set_instance_assignment -name IO_STANDARD "1.8 V" -to sys_resetn
 
 set_location_assignment PIN_F25   -to hps_ddr_ref_clk
 set_location_assignment PIN_G24   -to "hps_ddr_ref_clk(n)"
-
-set_instance_assignment -name IO_STANDARD LVDS -to hps_ddr_ref_clk
-set_instance_assignment -name IO_STANDARD LVDS -to "hps_ddr_ref_clk(n)"
-set_instance_assignment -name INPUT_TERMINATION DIFFERENTIAL -to hps_ddr_ref_clk -disable
-
 set_location_assignment PIN_B20   -to hps_ddr_clk_p     
 set_location_assignment PIN_B19   -to hps_ddr_clk_n     
 set_location_assignment PIN_B26   -to hps_ddr_a[0]
diff --git a/projects/common/a10soc/a10soc_system_qsys.tcl b/projects/common/a10soc/a10soc_system_qsys.tcl
index b5a29f7f8..939a31cb0 100644
--- a/projects/common/a10soc/a10soc_system_qsys.tcl
+++ b/projects/common/a10soc/a10soc_system_qsys.tcl
@@ -149,7 +149,7 @@ set_instance_parameter_value sys_hps_ddr4_cntrl {PHY_DDR4_USER_CK_MODE_ENUM} {OU
 set_instance_parameter_value sys_hps_ddr4_cntrl {PHY_DDR4_USER_DATA_IO_STD_ENUM} {IO_STD_POD_12}
 set_instance_parameter_value sys_hps_ddr4_cntrl {PHY_DDR4_USER_DATA_OUT_MODE_ENUM} {OUT_OCT_34_CAL}
 set_instance_parameter_value sys_hps_ddr4_cntrl {PHY_DDR4_USER_DATA_IN_MODE_ENUM} {IN_OCT_60_CAL}
-set_instance_parameter_value sys_hps_ddr4_cntrl {PHY_DDR4_USER_PLL_REF_CLK_IO_STD_ENUM} {IO_STD_CMOS_12}
+set_instance_parameter_value sys_hps_ddr4_cntrl {PHY_DDR4_USER_PLL_REF_CLK_IO_STD_ENUM} {IO_STD_LVDS_NO_OCT}
 set_instance_parameter_value sys_hps_ddr4_cntrl {PHY_DDR4_USER_RZQ_IO_STD_ENUM} {IO_STD_CMOS_12}
 set_instance_parameter_value sys_hps_ddr4_cntrl {MEM_DDR4_SPEEDBIN_ENUM} {DDR4_SPEEDBIN_2666}
 set_instance_parameter_value sys_hps_ddr4_cntrl {MEM_DDR4_TRCD_NS} {14.25}