Setup and Hold time constraints with clock skew, Static Timing Analysis

• Clock Skew is (T_capture - T_launch)
• For Setup Time - 

• Clock_Period > Td - (T_capture - T_launch) + T_setup
• So, for Positive Skew, if the skew is minimum then total delay on R.H.S. is maximum. And it'll determine Max Freq.
• For Negative Skew, if the negative value is maximum, max R.H.S. is achieved!
• For Hold Time - 

• T_hold + (T_capture - T_launch) < Td
• Which is, T_hold < Td - (T_capture - T_launch)
• For Positive Skew, If we ensure maximum value of skew then the Hold Time will be minimum.
• And for Negative Skew, minimum value will ensure min R.H.S. as well as min Hold Time.