Automated Clock Domain Relationship Analysis for IC Timing Exceptions
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Solution Overview
Problem
Current methods for managing clocks in integrated circuit design are ad-hoc and manually driven, requiring designers to explicitly declare clocks as synchronous or asynchronous, leading to delays in identifying timing exceptions, which are often noticed late in the design process, causing iterative corrections and delays in finalizing the circuit design.
Innovation Solution
A computer-implemented method that automatically identifies and manages clock domain relationships by categorizing clocks as source, generated, or virtual, determining their relationships, and assigning behavioral categories, thereby enabling early identification of timing exceptions between asynchronous and synchronous clocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual methods are used to manage clock relationships, then designers can control timing exceptions, but the process is time-consuming and delays design finalization
Solution Approach 1:
The system performs preliminary analysis of clock relationships and timing exceptions automatically during the design process, rather than relying on manual review at later stages. This early automated detection prevents timing issues from escalating and reduces the need for iterative corrections, thereby accelerating design finalization while maintaining accuracy.
Solution Approach 2:
The timing analysis system performs self-verification by automatically checking clock relationships and generating timing exceptions without requiring continuous manual intervention. The system monitors and manages its own analysis process, reducing the time designers would otherwise spend on repetitive manual verification while ensuring reliable timing exception identification.
2Ease of manufacture
If all clocks are treated as synchronous by default, then timing constraints are easily applied, but asynchronous clocks cannot be properly managed
Solution Approach 1:
The system dynamically determines clock relationships rather than using a fixed default. It automatically analyzes timing constraints and clock signals to identify whether clocks are synchronous or asynchronous, allowing the system to adapt its timing verification behavior to each specific clock pair. This dynamic approach maintains ease of constraint application while providing the flexibility to handle diverse clock relationships.
Solution Approach 2:
The system changes the timing constraint parameters based on the identified clock relationship type. For synchronous clocks, standard timing constraints are applied; for asynchronous clocks, the system adjusts parameters to allow greater flexibility in timing exceptions. This parameter adaptation enables both easy constraint application and versatile handling of different clock scenarios.
3Measurement precision
If designers manually review timing specifications, then timing exceptions can be verified, but the process becomes iterative and time-consuming
Solution Approach 1:
The system implements automated feedback by continuously monitoring clock relationships and generating timing exception reports without requiring manual verification. This feedback mechanism provides real-time information about timing issues, eliminating the need for iterative manual review and significantly improving design iteration speed while maintaining precise timing exception verification through automated analysis.
Data Source
AI summary
Systems and methods for identifying and managing the relationships between clock domains in an integrated circuit design are disclosed. A computer-implemented method analyzes the behavioral structure of the clock-to-clock logical relationships in a proposed integrated circuit design. In one embodiment, the method comprises receiving as inputs a description of the design (in a synthesizable format or a synthesized gate-level netlist and definitions of the clock waveforms and timing constraints used in the design, and automatically identifying the relationships between the clocks specified in the description and categorizing the relationships into a plurality of behavioral categories. A list of timing exceptions may optionally also be provided as an input. The identified relationships between clocks and the behavioral categories may be used to verify any existing timing exceptions between clock pairs, and/or to create any missing exceptions between the clock pairs.