Error(17044): Illegal connection on I/O input buffer primitive u0|pci_ddr_emif_0|pci_ddr_emif_0|arch|arch_inst|bufs_inst|gen_mem_dqs.inst[4].b|cal_oct.ibuf. Source I/O pin

Hi Sir,

It is hard for me to understand clearer with only the error message. I will need your design to check further. If you are unable to provide the design due to confidential issue. Then I will need your help to create a simple design that able to demonstrate the error or give me a steps to duplicate the error.