create_clock -name xclk -period 83.333 xclk
derive_pll_clocks
derive_clock_uncertainty
set_false_path -from spi_sck -to xclk
set_false_path -from xclk -to  spi_sck
set_false_path -from spi_sck -to  {pll|altpll_component|auto_generated|pll1|clk[3]}
set_false_path -from {pll|altpll_component|auto_generated|pll1|clk[3]} -to spi_sck