Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

TimeQuest Clock Assignments

Hi All, I'm closing the timing on a design using the EP3C5 series Cyclone III and there is a discrepancy on some of my signals as to which clock they are being assigned. I have three main cloc...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

I haven't seen that happen before. If you run "report_timing -setup -npaths 20 -detail full_path -panel_name test" and maybe add -from or -to to get the paths you're talking about, the detailed report should show how the register traces back to the clock driving it. It has to be a path that physically exists in the design. So either it will trace back to something you didn't expect or the clock constraint was applied to the wrong node. (At least those are my guesses).