Altera PLL and SDC timing constraints for Timequest

Also use the -create_base_clocks argument for derive_pll_clocks if you want the clock constraint on the PLL input to be created automatically.

As jimbo said, you can use write_sdc to get SDC commands to copy to your own .sdc file, but you can instead copy directly from the messages that derive_pll_clocks produces (omitting the "Info:" from the front of these messages). The messages will be in the .sta.rpt if you compile with derive_pll_clocks in the .sdc file. The messages will be in the Console window if you are working in the TimeQuest GUI; expand the "Info: Deriving PLL Clocks" message to see the submessages you need to copy.

And of course you can just leave derive_pll_clocks permanently in your .sdc file instead of using the create_generated_clock commands if you're willing to use the clock names that derive_pll_clocks produces.