DDR2 UniPhy OCT

Hi,

I am using DDR2 Uniphy and get an Error on calibrated OCT:

I run tcl after synthesis and tcl run successfully as qsf updated, for instance DDR IO constrained properly :

"set_instance_assignment -name IO_STANDARD "SSTL-18 CLASS I" -to DDR2_DQ

[*]set_instance_assignment -name INPUT_TERMINATION "PARALLEL 50 OHM WITH CALIBRATION" -to DDR2_DQ

[*] -tag __mtx_st820_mem_if_ddr2_emif_0_p0

set_instance_assignment -name OUTPUT_TERMINATION "SERIES 50 OHM WITHOUT CALIBRATION" -to DDR2_DQ

[*]

"

I get the following error:

"Error (174068): Output buffer atom "mtx_st820:mtx_st820|mtx_st820_mem_if_ddr2_emif_0:mem_if_ddr2_emif_0|mtx_st820_mem_if_ddr2_emif_0_p0:p0|mtx_st820_mem_if_ddr2_emif_0_p0_memphy:umemphy|mtx_st820_mem_if_ddr2_emif_0_p0_new_io_pads:uio_pads|mtx_st820_mem_if_ddr2_emif_0_p0_altdqdqs:dq_ddio[0].ubidir_dq_dqs|altdq_dqs2_ddio_3reg_stratixiv:altdq_dqs2_inst|extra_output_pad_gen[0].obuf_1" has port "SERIESTERMINATIONCONTROL[0]" connected, but does not use calibrated on-chip termination"

Why I getting this ERROR?

Thanks