Sunday, 11 October 2015

STA vs DTA

Why do we normally do Static Timing Analysis and not Dynamic Timing Analysis? What is the difference between them?


Timing Analysis can be done in both ways; static as well as dynamic. Dynamic Timing analysis requires a comprehensive set of input vectors to check the timing characteristics of the paths in the design. Basically it determines the full behavior of the circuit for a given set of input vectors. Dynamic simulation can verify the functionality of the design as well as timing requirements. For example if we have 100 inputs then we need to do 2 to the power of 100 simulations to complete the analysis. The amount of analysis is astronomical compared to static analysis.Static Timing analysis checks every path in the design for timing violations without checking the functionality of the design. This way, one can do timing and functional analysis same time but separately. This is faster than dynamic timing simulation because there is no need to generate any kind of test vectors. That’s why STA is the most popular way of doing timing analysis

Dynamic Vs Static STA

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