For a Stratix® V DDR3 UniPHY-based design, you may see hold timing violations on data paths between the c2p_write_clk and the pll_write_clk clock domains.
To resolve these hold timing violations, follow the steps below:
1) In the IP-generated <IP_variation_name>if0_pll0.sv file, set
parameter WRITE_CLK_PHASE = "938 ps"
2) In the IP-generated <IP_variation_name>if0_p0_parameters.tcl file, set
set ::GLOBAL_mem_if_ddr3_emif_example_design_example_if0_p0_pll_phase(PLL_WRITE_CLK) 270.0