Modeling Dynamic Parasitic Loading Effects on Scan Network Timing Margins
Dynamic parasitic extraction during ATPG shift prevents false timing violations by accounting for state-dependent capacitance and power rail collapses.
Vector Aware Timing Analysis
Calculation Methodology
Analysis procedures evaluate circuit delays by incorporating specific input patterns to account for the impact of real-world switching behavior on circuit performance. Using vector aware timing analysis allows engineers to identify timing violations that only occur under certain logic conditions. This approach provides a more realistic assessment than traditional static analysis.
Analysis Workflow
Implementation begins by extracting switching activity from functional simulations or test vectors. During vector aware timing analysis, the tool uses this data to calculate the power-induced noise and the resulting delays for each gate in the circuit. This allows for an accurate prediction of the timing margins by considering the actual state of the neighboring nets.
Designers use these results to optimize the design for specific workloads and to reduce the amount of pessimism in the timing reports. Sophisticated software links the electrical simulation of the power grid with the logical timing of the signal paths.
Design Optimization
Reliability of the final timing sign-off is improved by focusing on the paths that are most likely to fail during actual operation. If vector aware timing analysis reveals a potential failure, the design can be adjusted to strengthen the affected signals. This targeted approach helps to achieve high performance and low power consumption without compromising the functional integrity of the device.