Altera_Forum
Honored Contributor
14 years agoSetting up Generated Clock Constraints for PLL in NIOS
My design is based on a Nios Processor in an Cyclone 3 FPGA.
I am working with the Quartus TimeQuest Timing Analyzer and trying to Create a Generated Clock constraint for a PLL that we have in the Nios Processor. I am using the GUI of TimeQuest for this. In the Create Generated Clock GUI window I can set the clock name and the source... but I do not know what should I put in the "target" box in the Create Generated Clock window? My pll is called altpll_0_c0. So I know that the target should somehow refer to this PLL... from the "name finde window" I get the all names that contain "altpll_0_c0"... there are two that I think that could be the target clock, but one says: inst\|cycloneIII_embedded_evaluation_kit_standard_sopc_reset_altpll_0_c0_out_domain_synch\|data_in_d1|clk and the other inst\|cycloneIII_embedded_evaluation_kit_standard_sopc_reset_altpll_0_c0_out_domain_synch\|data_out\|clk I do not know which one to choose... one contains "data_in_d1" and the other "data_out" I am confused... Any comments/help is welcome