Forum Discussion
Suhas_P_Intel
New Contributor
7 years agoSTA report using Quartus 18.0 pro
The clock period and the frequency in the attached spreadsheet for the constraints specified do not match constraints and each other. The desired frequencies are specified by using clock edges of uCl...
sstrell
Super Contributor
7 years agoHmm. For xtr_clk, based on the edges, the clock rises at 0 ns, falls at 100 ns, and rises again at 200, making for a period of 200 (correct) and a frequency of 5 MHz (incorrect). For msg_clk, the clock rises at 100 ns (which is a falling edge in uclock but I don't know if that makes a difference), falls at 300 ns, and rises again at 500 ns, making for a period of 500 (incorrect) and a frequency of 2 MHz (also incorrect).
I'm not sure what's going on here, but I rarely, if ever, see the -edges option used. Is there a reason you're using time relationships instead of frequency?