Automatic Timing Constraint Generation for IC Clock Graphs
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Solution Overview
Problem
The complexity of clock signals in integrated circuit designs, particularly with circuit elements like clock dividers, makes it difficult to specify and enforce timing constraints, leading to lengthy design verification processes and potential timing violations, which can delay the development of efficient integrated circuits.
Innovation Solution
A method for automatically generating and annotating integrated circuit designs with timing constraints using a clock graph analysis, determining common clocks and setting timing constraints based on the period of these clocks to ensure reliable signal propagation and reduce design iteration time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual timing constraint specification is used in complex clock signal designs, then timing constraint accuracy may be improved, but design verification time and complexity increase significantly
Solution Approach 1:
The system performs self-service by automatically generating timing constraints through clock graph analysis without requiring manual specification. The EDA tool autonomously traverses the clock graph, identifies clock relationships, and generates appropriate timing constraints, eliminating the time-consuming manual process while maintaining accuracy.
Solution Approach 2:
The manual mechanical process of specifying timing constraints is replaced by an automated computational system. The EDA tool uses clock graph traversal algorithms and automated analysis to substitute the manual specification process, significantly reducing verification time while maintaining constraint accuracy.
2Measurement precision
If detailed clock signal analysis is performed manually, then timing violation detection accuracy is improved, but design iteration time increases
Solution Approach 1:
The manual analysis process is replaced by automated clock graph traversal and timing analysis algorithms. The system automatically detects timing violations by analyzing clock relationships and path delays, maintaining detection accuracy while dramatically increasing design iteration speed.
Solution Approach 2:
The system enables continuous timing analysis throughout the design process by automatically generating and updating timing constraints as the design evolves. This continuous automated analysis maintains high detection accuracy without interrupting the design flow, thereby increasing iteration speed.
3Loss of time
If automated timing constraint generation is implemented, then design verification time is reduced, but handling of complex clock relationships may become challenging
Solution Approach 1:
The complex clock relationship analysis is segmented into manageable components through clock graph representation. The system divides the overall timing analysis into discrete clock paths and relationships, making automated handling of complex clock structures feasible while reducing verification time.
Solution Approach 2:
The clock graph serves as an intermediary data structure that simplifies complex clock relationships. By representing clocks, derived clocks, and their relationships in a graph format, the system enables automated timing constraint generation without being overwhelmed by the complexity of direct clock signal analysis.
4Ease of operation
If manual timing constraint specification is used, then control over timing parameters is improved, but placement and routing optimization is delayed
Solution Approach 1:
Manual timing parameter specification is replaced by automated generation from clock graphs. The system maintains control over timing parameters by deriving them systematically from clock relationships, while enabling faster placement and routing optimization through immediate availability of timing constraints.
Solution Approach 2:
Timing constraints are generated in advance during the design phase before placement and routing optimization. This preliminary automated generation of timing parameters enables subsequent optimization processes to proceed faster without waiting for manual specification.
Data Source
AI summary
A method includes: receiving an integrated circuit design; obtaining a timing path between a first sequential circuit element at a launch end of the timing path and a second sequential circuit element at a capture end of the timing path of the integrated circuit design; determining, by a processing device, a common clock that drives a first clock clocking the first sequential circuit element and a second clock clocking the second sequential circuit element based on a clock graph of relationships between a plurality of clocks of the integrated circuit design; and setting a timing constraint for the timing path of the integrated circuit design based on a period of the common clock.