Because semiconductor design is growing larger and more complex, verification is one of the most challenging phases of the semiconductor design process. Traditional methods of verification are challenged by the growing complexity of design interactions, higher levels of functionality and shorter timelines to deliver full confidence within a reasonable time. Closing the silicon verification gap will call for a coordinated effort that integrates formal verification, dynamic simulation and AI agents.
The Role of Formal Verification
Formal verification is a process of mathematically analyzing a design to determine if it meets known properties and specifications. Formal tools can take a large number of design states that would not be explored using selected test scenarios.
This is especially helpful for formal verification to identify corner cases which are hard to trigger through simulation. It can also be used for control logic, protocol, safety properties and design assertions. Along with formal analysis, however, there can be problems of scalability as design complexity grows.
Dynamic Simulation Provides Practical Coverage
Dynamic simulation is still a vital component in verification as the engineers can see how a design will perform in a specific workload, test case and operating state. Functional scenarios can be validated using simulation and teams can understand interactions between various blocks and system components.
Regression environments can run large sets of tests, multiple times to detect problems that are caused by design changes. But the accuracy and number of tests used is central to the success of the simulation-based verification. Even after a good number of regression runs, some rare situations may not be explored.
AI Agents Can Support Verification Workflows
AI agents can provide extra support to engineers in repetitive and data-heavy verification tasks. Depending on the workflow, AI systems can help to analyze failures, cross-correlate results from the regression and suggest test scenarios or prioritize test areas that might need more attention.
AI agents can also streamline engineers’ access to vast amounts of verification data. They are not meant to be a replacement for existing verification techniques; they are intended to be used in conjunction with them, to help engineers focus on higher value decisions, and to minimize manual analysis.
Combining the Three Approaches
Formal verification, dynamic simulation and AI agents are complementary technologies, with the greatest benefit coming from utilizing them together. Formal verification can address properties and corner-cases, and simulation can be used to work through real functional situations. AI agents can be used to interpret outcomes from both methods and spot any areas that may be overlooked.
Imagine if simulation shows a pattern of failures recurring and that can be clustered and analysed by an AI system. Formal verification can then be targeted to other properties or corner cases. The feedback from the resulting insights can then be used to fuel further simulation testing: A more focused verification cycle.
Supporting Faster Tapeout Decisions
Tapeout is when one feels they are confident the design has been sufficiently verified for manufacture. None of the single verification techniques can assure that all defects can be detected. However, a coordinated methodology can enhance coverage in several ways, reduce analysis cycles that are repetitive, and enable engineers to find significant gaps quicker.
Conclusion
Measuring silicon verification gap closure is not just about the amount of tests. Each of these approaches to formal verification can attend to various components of the verification problem—formal verification, dynamic simulation, and AI agents. They can be used in conjunction with a well defined workflow to enhance coverage, faster failure analysis and more effective utilization of the verification time. This collective effort can ultimately lead to higher design confidence and contribute to semiconductor teams getting to tapeout faster.
Frequently Asked Questions
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