STA Interview Questions with Answers
Why timing analysis is an Important Factor?
There are main two reasons for the importance of static timing analysis.
- Timing analysis is utilized to choose the best components because few of them are slow. Because the slow component adds to wait for the state, the circuit’s performance will suffer. The fast component is costly, so the Timing analysis thus decides which component is best for a given application.
- Timing analysis checks to see if the circuit is well-designed and produces dependable output for all input combinations.
What are the major functions of STA?
The major functions of STA are.
- Hold time
- Setup time
- Clock gating
- Reset Removal Time
- Reset recovery Time
- Min/max fan-out range
- Maximum capacitance range
- Clock pulse width requirements
What are the important features of STA?
- STA has Simple toolkits.
- It uses the Elmore wire delay model.
- The design is divided into many timing pathways using STA.
- Determine the delay in signal propagation along each path.
- Check for timing violations in the design and the I/O interface.
- Input-output variables are not necessary for STA.
- Timing analysis is done for all available paths, including any erroneous paths that might exist.
- STA uses device models based on lookup tables.
- STA accepts a library, netlist, constraints, and parasitic (R & C) as input.
- To determine whether the circuit’s required delays are met, STA performs the worst-case analysis.
What is the difference between static and dynamic timing analysis?
Static Timing Analysis (STA) is significantly faster compared to dynamic simulation because it doesn’t require simulating the logical operations of the circuit. Additionally, STA offers greater thoroughness as it examines all timing paths, not solely the logical conditions activated by a specific set of test vectors.
