Timing Analysis on Calibrated Paths Using STA Emulation
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Solution Overview
Problem
Static timing analysis (STA) is inadequate for calibrated paths in digital circuits, as it fails to account for dynamic changes during calibration and varying operating conditions, leading to inaccurate delay information and inefficient optimization processes.
Innovation Solution
Integrate STA with calibration and operating condition effects to provide quick and accurate timing analysis by using STA engines to compute delays and emulating calibration operations, accounting for uncertainties and variations in voltage, temperature, and process changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If simulation is used to obtain accurate delay information for calibrated paths, then measurement precision is improved, but runtime increases significantly making it unsuitable for real-time feedback
Solution Approach 1:
The patent segments the timing analysis into two distinct phases: (1) conventional STA for static paths that provides quick delay estimates, and (2) calibration-specific analysis for dynamic paths that captures calibration effects. This segmentation allows most of the circuit to be analyzed using fast STA while only the calibrated portions require more detailed simulation, thereby reducing overall runtime while maintaining accuracy where needed.
Solution Approach 2:
The patent performs preliminary STA analysis on all paths before calibration to establish baseline delay values. This preliminary action provides initial timing estimates that can be quickly updated during calibration based on observed signal transitions, avoiding the need to perform complete simulation from scratch and enabling real-time feedback during the calibration process.
2Loss of time
If conventional STA is used for calibrated paths, then runtime is reduced, but accuracy deteriorates because STA cannot account for dynamic topology changes during calibration
Solution Approach 1:
The patent introduces dynamic elements to the timing analysis by detecting actual signal transitions during calibration and updating path delays in real-time. Instead of treating calibrated paths as static, the system dynamically adjusts timing parameters based on observed calibration behavior, enabling accurate timing analysis that adapts to topology changes while maintaining the speed advantages of STA.
Solution Approach 2:
The patent implements feedback mechanisms where timing analysis results from calibration operations are fed back into the STA engine to update delay models. This feedback loop allows the system to learn from actual calibration behavior and improve the accuracy of subsequent timing predictions, combining the speed of STA with the accuracy of calibration-aware analysis.
3Productivity
If calibration operations are emulated with STA, then productivity is improved through faster analysis, but reliability may be compromised without considering all operating conditions
Solution Approach 1:
The patent systematically varies operating parameters (voltage, temperature, process corners) during timing analysis to ensure results are valid across all expected conditions. By changing these parameters and observing their effects on calibrated path timing, the system maintains reliability while using the efficient STA methodology, rather than relying on exhaustive simulation across all conditions.
Data Source
AI summary
A method for performing timing analysis on calibrated paths includes performing static timing analysis on the calibrated paths to obtain delay and margin information. The delay and margin information are utilized to emulate operations performed during calibration.