Get FMax report at different locations for the same clock

[Altera_Forum]

Hello Gurus, 

 I've a master clock that feeds different modules (say A,B,C). How to know the individual max frequency for each of the modules? Suppose the critical path is in module B and I know I won't be enabling it, then theoritically I can input Clk to the max supported by A or C. But TimeQuest will report FMax only for the top level clocks.  Thanks, Gopal

[Altera_Forum]

Hi, 

 If you know for sure you are not enabling B, you can simple cut it by adding a false path from B* to B*. look for set_false_path in the help or google "set_false_path TimeQuest".  But if you don't want to remove B from the analysis, you can use report_timing -from A* -to A* to check the timing for A. Of course, I am assuming you have a target period defined on the clock, so this will show you the slack for paths within A.  Hope this helps.  DK

[Altera_Forum]

--- Quote Start ---  Hi,  If you know for sure you are not enabling B, you can simple cut it by adding a false path from B* to B*. look for set_false_path in the help or google "set_false_path TimeQuest".  But if you don't want to remove B from the analysis, you can use report_timing -from A* -to A* to check the timing for A. Of course, I am assuming you have a target period defined on the clock, so this will show you the slack for paths within A.  Hope this helps.  DK  --- Quote End ---    Thanks, this is exactly what I was looking for.