STA stands for Static Timing Analysis. It is a crucial step in the design and verification of digital integrated circuits. STA is used to ensure that the digital circuit meets its timing requirements, such as setup time, hold time, and clock-to-q delays.
Static Timing Analysis involves analyzing the timing characteristics of a circuit without considering the actual data values. It takes into account the delays of all elements in the circuit, such as logic gates, interconnects, and flip-flops, to ensure that the circuit meets its performance requirements under certain-case conditions.