Clock Uncertainity

[Altera_Forum]

Hello All, 

  Consider a FF1-Comb-FF2 circuit, both flops clocked by same clock clk1. If clock frequency of clk1 is 16 ns, Comb delay is 0 ns, FF set up time is 0.2 ns and Clock uncertainity is 0.5 ns,    1. What will be max operating freq of this system. ?  2. Will clock unceratainity be used in max freq calculation ?  Plz share your thoughts,  regards, freak

[Altera_Forum]

Hi, 

 The classic timing analyser uses this equation for Fmax:   fmax = 1/(register to register delay - clock delay + micro tsu + micro tco)   As to clock uncertainty, I believe I should add it to Tco